Operating Instruction Manual

OPERATING INSTRUCTION MANUAL

Powerful Simple Reliable CONTENTS

INTRODUCTION�� 5 MODELS COVERED BY THIS MANUAL��5 FEATURE LIST�� 6 INSTALLING STRAPS OR BUNGEE CORD�� 7 BUNGEE CORD��8 TURNING ON�� 9 COLOUR CODING��11 THE TOP ROW�� 12 THE CENTER ROW�� 16 CENTER ROW CONFIGURATION�� 17 THE BOTTOM ROW�� 18 INFO SCREENS��21 COMPASS�� 27 OPEN CIRCUIT MENU STRUCTURE�� 31 CLOSED CIRCUIT (INT. PPO2) MENU STRUCTURE�� 32 SIMPLE EXAMPLE DIVE�� 33 COMPLEX EXAMPLE DIVE��34 GAUGE MODE�� 38 STOPWATCH�� 38 RESETTABLE AVERAGE DEPTH�� 38 DECOMPRESSION AND GRADIENT FACTORS��39 MENU REFERENCE��41 TURN OFF ��41 SWITCH SETPOINT�� 42 SELECT GAS�� 43 RADIO STATION GASES �� 44 SWITCH TO CC/BO �� 47 DIVE SETUP+ �� 47 LOW SETPOINT ��47 HIGH SETPOINT �� 48 DEFINE GAS �� 49

Operations Manual Perdix 2 Manual DocRev A CONTENTS

DIVE PLANNER+ ��52 CONSERVATISM �� 54 NDL DISPLAY ��55 BRIGHTNESS ��58 DIVE LOG MENU�� 59 DISPLAY LOG �� 59 UPLOAD LOG �� 59 EDIT LOG NUMBER �� 59 SYSTEM SETUP+�� 61 MODE SETUP �� 62 DECO SETUP �� 64 OC GASES �� 64 CC GASES �� 64 AUTO SP (SETPOINT) SWITCH �� 65 DISPLAY SETUP �� 66 COMPASS SETUP �� 69 SYSTEM SETUP �� 71 ADVANCED CONFIGURATION 1 ��72 ADVANCED CONFIGURATION 2 ��73 FIRMWARE UPLOAD��74 DIVE LOG DOWNLOAD�� 76 CHANGING THE BATTERY�� 78 BATTERY TYPES ��79 BEHAVIOR ON BATTERY CHANGE �� 80 ERROR DISPLAYS�� 83 TROUBLESHOOTING�� 85 ERROR DISPLAYS�� 86 STORAGE AND MAINTENANCE�� 88 SERVICING ��88 SPECIFICATIONS �� 89 FCC WARNING �� 90 INDUSTRY CANADA WARNING �� 90 CONTACT �� 91

Operations Manual Perdix 3 Manual DocRev A DANGER

This computer is capable of calculating deco stop requirements. These calculations are at best a guess of the real physiological decompression requirements. Dives requiring staged decompression are substantially more risky than dives that stay well within no-stop limits.

Diving with rebreathers and/or diving mixed gases and/or performing staged decompression dives and/or diving in overhead environments greatly increases the risk of scuba diving. YOU REALLY ARE RISKING YOUR LIFE WITH THIS ACTIVITY.

WARNING

This computer has bugs. Although we haven’t found them all yet, they are there. It is certain that there are things that this computer does that either we didn’t think about, or planned for it to do something different. Never risk your life on only one source of information. Use a second computer or tables. If you choose to make riskier dives, obtain the proper training and work up to them slowly to gain experience.

This computer will fail. It is not whether it will fail but when it will fail. Do not depend on it. Always have a plan on how to handle failures. Automatic systems are no substitute for knowledge and training.

No technology will keep you alive. Knowledge, skill, and practiced procedures are your best defense (Except for not doing the dive, of course).

Operations Manual Perdix 4 Manual DocRev A INTRODUCTION

The Shearwater Perdix is an advanced technical diving computer for open and closed circuit divers.

Although we strive to make the Perdix easy enough to use without reading the manual, please take some time to read this manual to get the best performance from your new computer. Diving involves risk and education is your best tool for managing this risk.

MODELS COVERED BY THIS MANUAL This manual provides operating instructions for the Perdix.

Operations Manual Perdix 5 Manual DocRev A FEATURE LIST

Depth, time and oxygen Open and closed circuit, sensor display switchable during a dive Bühlmann decompression 5 CC and 5 OC gases model with gradient factors Gases can be changed and conservatism added during a dive Optional VPM-B CNS tracking decompression model No lockout from violating Imperial and metric displays deco stops Available in Standalone (SA) Automatic PPO2 set-point model only switching (configurable) A menu system that adapts Two PPO2 set-points, each to diving status of which can be set between Automatic turn off after .4 and 1.5 15 minutes on the surface Flexible user replaceable Depth sensor functions past battery. Almost any 300msw, crush pressure ‘AA’ type rating is 260msw (this is due Tilt compensated digital to the case) compass Dive Planner 1000 hour dive log memory Any combination of oxygen, Log downloads and firmware nitrogen, and helium upgrades using Bluetooth (Air, Nitrox, Trimix)

PERDIX INTRODUCTION

To see a video introduction to the Shearwater Perdix visit our YouTube page: https://youtu.be/j8Mxzl2u7Ow

Operations Manual Perdix 6 Manual DocRev A INSTALLING STRAPS OR BUNGEE CORD

The Perdix includes mounting points for either two elastic straps or two bungee cords. Both types are included in the box. Straps

Install the elastic straps as shown in the image below. The buckles feature a locking mechanism to prevent them from inadvertently loosening. Press the tab to allow the buckle to slide freely on the straps. Strap width is 3/4” (19 mm).

Install the straps and buckles as shown

Operations Manual Perdix 7 Manual DocRev A BUNGEE CORD

Bungee cord can be installed in many ways based on your preference. Two examples are shown. The holes are sized for 3/16” (4.8 mm) diameter cord.

Allergy Alert! The supplied elastic surgical tubing contains LATEX.

A simple overhand knot (at left) works well to secure the bungee cord.

However, this knot can pull

1 through the mounting holes 3 under very high load.

We find that the knot at right works well. 1

This knot has the nice feature 4 3 of creating loops that stay wide 2 open while putting the Perdix on your wrist.

Tip: Use two pieces of cord

When using the bungee cord, always create two independent loops so that a single break does not result in a lost dive computer. If using a single continuous piece of cord, isolate the sides with a knot.

Operations Manual Perdix 8 Manual DocRev A TURNING ON

To turn the Perdix on, press both the MENU (left) and the SELECT (right) buttons at the same time.

Auto-On The Perdix will automatically turn-on when submerged underwater. This is based on pressure increase and not on the presence of water.

DO NOT RELY ON THE AUTO-ON FEATURE

This feature is supplied as a backup for when you forget to turn on your Perdix. Shearwater recommends turning on manually before each dive to confirm proper operation and to double check battery status and setup.

Auto-On Details

The Perdix turns on automatically when the absolute pressure is greater than 1100 millibar (mbar). For reference, normal sea level pressure is 1013 mbar and 1 mbar of pressure corresponds to approximately 1 cm (0.4") of water.

So the Perdix will automatically turn-on when about 0.9 m (3 ft) underwater when at sea level. If at higher altitude, then the Perdix auto-on will occur at a deeper depth. For example, when at 2000 m (6500 ft) altitude the atmospheric pressure is only about 800 mbar. Therefore, at this altitude the Perdix must be submerged underwater by 300 mbar to reach an absolute pressure of 1100 mbar. This means the auto-on occurs at about 3 m (10 ft) underwater when at an altitude of 2000 m.

Operations Manual Perdix 9 Manual DocRev A BUTTONS Two piezo-electric buttons are used to change settings and view menus. Except for turning the Perdix on, all operations are simple single button presses.

MENU (left) button

SELECT (right) button

Don’t worry about remembering all the button rules below. Button hints make using the Perdix easy.

MENU button (Left) From main screen > Brings up the menu In a menu > Moves to the next menu item Editing a setting > Changes the setting’s value

SELECT button (Right) From main screen > Steps through information screens In a menu > Performs command or starts editing Editing a setting > Saves the setting’s value

BOTH BUTTONS When Perdix is off pressing MENU and SELECT at the same time will turn the Perdix on. No other operation requires pressing both buttons at the same time.

BUTTON HINTS DEPTH TIME SURFACE 0 2hr15mn GasPO2 When in a menu, button hints label each button. 1.2 For example, the hints to the right tell us: Brightness Med Use MENU to change the brightness value. Change Save Use SELECT to save the current value. MENU hint SELECT hint

Operations Manual Perdix 10 Manual DocRev A THE MAIN SCREEN

The main screen shows the most important information needed for technical diving.

DEPTH TIME STOP TIME Top Row Depth, Time & 220 22 130 1}Deco Stops GasPO2 Centre Row 1.15 }PPO2 O2/HE NDL TTS Bottom Row Mode, Gas & OC 15/40 0 56}Deco Info

COLOUR CODING

Colour coding of text draws attention to problems or unsafe situations. Sample warning - text indicates normal a better gas is available conditions. Flashes YELLOW is used for warnings that are not immediately dangerous but should be addressed. Sample critical alert - FLASHING RED is used for critical continuing to breathe this alerts that could be life threatening if gas could be fatal not immediately addressed.

COLOR BLIND USERS The warning or critical alert states can be determined Warningwithout the use of color. Warnings display on a solid inverted Critical alerts flash between inverted and background. Warning - doesn't flash. normal text. Critical alert - flashes. Warning Alert Flashes Alert

Operations Manual Perdix 11 Manual DocRev A Alert Alert THE TOP ROW

The top row shows depth and time information DEPTH TIME STOP TIME 220 22 130 1

Depth Imperial: In feet Metric: In meters (displays with 1 (no decimal places). decimal place up to 99.9m) DEPTH TIME STOP TIMEDEPTH

220 in feet22 130 6 91.7 in meters Note: If the depth shows a Flashing Red zero or shows at depth at the surface, then the depth sensor needs service.

Ascent Bar Graph Shows how fast you are currently ascending. Imperial: 1 arrow per 10 feet per minute (fpm) of ascent rate. Metric: 1 arrow per 3 meters per minute (mpm) of ascent rate.

when 1 to 3 arrows 30 fpm / 9 mpm

Yellow when 4 to 5 arrows 50 fpm / 15 mpm

Flashes Red when 6 arrows plus 60+ fpm / 15+ mpm

Note: Deco calculations assume 33fpm (10mpm) ascent rate.

Operations Manual Perdix 12 Manual DocRev A Dive Time The length of the current dive in minutes.

The seconds display as a bar drawn below the word “Time.” It takes 15 seconds to underline each character in the word. Does not display the seconds bar when not diving.

in minutes seconds bar TIME TIME at about 40s 22

Battery Icon The default behavior is that the battery icon22 is shown on the surface but disappears when diving. If low or critical then the battery icon will appear while diving.

Yellow when the battery needs to be changed.

Red when the battery must be replaced immediately.

OK low battery Change battery

Operations Manual Perdix 13 Manual DocRev A Stop Depth and Time

Stop – The next decompression stop depth in the current units (feet or meters). This is the shallowest depth to which you can ascend.

Time – The time in minutes to hold the stop.

STOP TIME 90 2 Stop at 90ft for 2 min

Will Flash Red if you ascend shallower than the current stop. DEPTH TIME STOP TIME Alert - depth is shallower 84 62 90 2 than the 90ft stop depth

By default the Perdix uses a 10ft (3m) last stop depth. At this setting, you may perform the last stop at 20ft (6m) with no penalty. The only difference is that the predicted time-to-surface will be shorter than the actual TTS since off-gasing is occurring slower than expected.

There is also an option to set the last stop to 20ft (6m) if you wish.

Operations Manual Perdix 14 Manual DocRev A Surface Interval

When on the surface, the STOP DEPTH and TIME are replaced by a surface interval display.

Shows the hours and minutes since the end of your last dive. Above 4 days, the surface interval is displayed in days.

The surface interval is reset when the decompression tissues are cleared. See the section on Tissues Cleared.

DEPTH TIME SURFACE 0 2hr15mn GasPO2 .21 O2/HE NDL TTS OC 21/00 0 0 Sample surface main screen showing the surface interval

Operations Manual Perdix 15 Manual DocRev A THE CENTER ROW

The center row displays PPO2. PPO2 units are absolute atmospheres (1ata = 1013mbar).

The layout varies depending on the current mode

Mode Menu Setup Center Row Display

Dive Setup Mode OC Salinity Fresh GasPO2 Open Circuit A A 1.15 A OC Gas Next Edit

Dive Setup Closed Mode OC/CC Circuit with Salinity Fresh Internal PPO2 PPO2 Mode Int. 1.3 Low SP 0.7 Setpoints High SP 1.3 CC Internal Setpoint Next Edit

Note: The above limits can be adjusted in the Adv. Config 2 menu.

Watch the video: Configurable Center Row

Operations Manual Perdix 16 Manual DocRev A CENTER ROW CONFIGURATION

In most modes, the center row displays can be customized.

The center position can only display PPO2. In OC only mode, the PPO2 display can optionally be turned off.

Configure the center row in the System Setup Center Row Menu.

The left and right positions can be set to display the following:

Centre Row DEPTH TIME STOP TIME Left Max Depth 22 130 1 200 Center Gas PPO2 Custom MAX GasPO2 Display Right None 225ft 1.15 O2/HE NDL TTS Next Edit OC 15/40 0 56

Option Description None Blank (default value). Max Depth The maximum depth of the current or previous dive. Avg Depth The average depth of the current or previous dive. @+5 The TTS if remaining at current depth for 5 more minutes. Ceil The current decompression ceiling (not rounded to the stop interval). GF99 The Bühlmann ZHL-16C super-saturation percent gradient. CNS Central Nervous System (CNS) toxicity clock as a percentage. Clock The time-of-day in 24hr or am/pm format (same as system setting). Does not show ”am” or “pm”. DET Dive End Time. The time-of-day when the dive will end (i.e. Clock plus TTS). In 24hr or am/pm format (same as system setting). Does not show “am” or “pm”. Compass A mini compass as an optional display. Works like a regular compass with the red end of the needle always points to North. Timer Timer (stopwatch) display. Compass A miniature compass. Works like a regular compass with the red end of the needle always points to North.

Operations Manual Perdix 17 Manual DocRev A THE BOTTOM ROW

The bottom row displays the current mode, gas and decompression information. O2/HE NDL TTS OC 15/40 0 56

Circuit Mode The current breathing configuration. One of: OC or OC CC OC = Open circuit CC = Closed circuit (when CC available, displays in Yellow to indicate bailout condition)

Current Gas (O2/He)

O2/HE O2/HE O2/HE 21/00 10/50 21/00 Air Tx A better deco { { gas available 21% O2 10% O2 79% N2 50% He 40% N2

The current In closed circuit Displays in Yellow gas shown as a mode, this gas is when there is better percentage of the diluent. In open deco gas available Oxygen and Helium. circuit mode this is than the current gas. The remainder of the the breathing gas. gas is assumed to be Nitrogen.

Operations Manual Perdix 18 Manual DocRev A No Decompression Limit (NDL) NDL NDL 20 5

The time remaining, in minutes, Once NDL reaches 0 (i.e. deco at the current depth until stops needed), the NDL display decompression stops will be is just wasting space. To address necessary. Displays in Yellow this, a few different values can when the NDL is less than 5 be set to replace the NDL (see minutes. Dive Setup NDL Display). The options are listed below.

NDL Replacement Options GF99 @+5 CEIL 80% 20 74

GF99: The raw @+5: The predicted CEIL: The current percentage of the time-to-surface ceiling in the Bühlmann allowable (TTS) if you were to current units (feet supersaturation at stay at the current or meters). Flashes the current depth. depth for 5 more Red if you ascend minutes. shallower than the current ceiling.

TTS 35

Time-to-Surface (TTS) The time-to-surface in minutes. This is the current time to ascend to the surface including the ascent plus all required deco stops.

Assumes: Ascent rate of 33 feet per minute (10 meters per minute). Decompression stops will be followed. Programmed gases will be used as appropriate.

Operations Manual Perdix 19 Manual DocRev A The bottom row is also used to show additional information.

By using only the bottom row for this additional information, the critical information contained on the Top and Center Rows is always available during a dive.

The additional information that can be displayed on the bottom row includes:

Info: Shows additional dive information.

Info Screens: Press SELECT (right button) to step through info screens.

Menus: Allows changing settings. Press MENU (left button) to enter menus.

Warnings: Provide important alerts. Press SELECT (right button) to clear a warning.

DEPTH TIME STOP TIME DEPTH TIME STOP TIME DEPTH TIME STOP TIME 220 22 130 1 220 22 130 1 62 38 70 2 GasPO2 GasPO2 GasPO2 1.15 1.15 1.42 MAX AVG AvgATM Brightness Med Error CONFIRM 234ft 190 ft 6.76 Change Save MISSED DECO STOP Sample Info Screen Sample Menu Sample Warning

The bottom row is used to display additional information

Operations Manual Perdix 20 Manual DocRev A INFO SCREENS

DEPTH TIME STOP TIME

220 22 130 1 Info screens display on the bottom row. GasPO2 Press SELECT (right) button to step 1.15 through the info screens. O2/HE NDL TTS OC 15/40 0 56 SELECT button MAX AVG AvgATM 234ft 190 ft 6.76 SELECT button TEMP GF CNS 63 o F 30/85 8 ...SELECT button

Info screens provide additional information that does not fit on the main screen.

Starting from the main screen, the SELECT (right) button steps through the info screens.

When all info screens have been viewed, pressing SELECT again will return to the main screen.

Info screens time-out after 10 seconds, returning to the main screen. Pressing the MENU (left) button will also return to the main screen.

The info screen content is optimized for each mode. Set the Perdix to the mode you will be using (e.g. OC) and step through the info screens to get familiar with the content.

The next section describes the individual values shown on the info screens.

Operations Manual Perdix 21 Manual DocRev A AVG Average Depth Displays the average depth of the current dive, updated once per 50ft second. When not diving, shows the average depth of the last dive.

AvgATM Average Depth in Atmospheres (AvgATM) The average depth of the current dive, measured in absolute atmospheres (i.e. a value of 1.0 at sea level). When not diving, 2.52 shows the average depth of the last dive.

MAX Maximum Depth ft The maximum depth of the current dive. 260 When not diving, displays the maximum depth of the last dive.

CNS CNS Toxicity Percentage Central Nervous System oxygen toxicity loading percentage. 11 Flashes Red when 100 or greater.

CNS The CNS percentage is calculated continuously, even when on the surface and turned off. When deco tissues are reset, the CNS will 100 also be reset.

CNS Toxicity Percentage Central Nervous System oxygen toxicity loading percentage. Flashes Red when 100 or greater.

The CNS percentage is calculated continuously, even when on the surface and turned off. When deco tissues are reset, the CNS will also be reset.

The CNS value (short for Central Nervous System Oxygen Toxicity) is a measure of how long you have been exposed to elevated partial pressures of oxygen (PPO2) as a percentage of a maximum allowable exposure time. As PPO2 goes up, the maximum allowable exposure time goes down. The table we use is from the NOAA Diving Manual (Fourth Edition).

During a dive the CNS never decreases. When back at the surface, a half-life of elimination of 90 minutes is used. So for example, if at the end of the dive the CNS was 80%, then 90 minutes later it will be 40%. In 90 more minutes it will be 20%, etc. Typically after about 6 half-life times (9 hours), everything is back close to equilibrium (0%).

Operations Manual Perdix 22 Manual DocRev A PPO2 Also, when using external sensors and you have bailed out to OC, the center row continues to display the external measured PPO2. .36 Use this info display to see the OC PPO2. In CC mode, displays in Flashing Red when less than 0.40 or PPO2 greater than 1.6. In OC mode, displays in Flashing Red when less than 0.19 or .16 greater than 1.65.

DilPPO2 Diluent PPO2 Only displayed in CC mode. Displays in Flashing Red when the .99 partial pressure of the diluent is less than 0.19 or greater than 1.65. When performing a manual diluent flush, you can check this value to see what the expected PPO2 will be at the current depth.

FiO2 Fraction Inspired O2 (FiO2) The fraction of the breathing gas composed of O2. .42 This value is independent of pressure.

Operations Manual Perdix 23 Manual DocRev A TISSUES

TISSUES

Tissues Bar Graph TISSUES

The tissues bar graph shows the tissue compartment inert gas tissue tensions based on the Bühlmann ZHL-16C model. Note that VPM-B also tracks tensions in the same way.

The fastest tissue compartment is shown on the top, and the slowest on the bottom. Each bar is the combined sum of the nitrogen and TISSUEShelium inert gas tensions. Pressure increases to the right. The vertical black line shows the inert gas inspired pressure. The boundary between the green and yellow zones is the ambient pressure. The boundary between the yellow and red zone in the ZHL-16C M-Value pressure.

Note that the scale for each tissue compartment above the green zone is different. The reason the bars are scaled in this way is so that the tissues tensions can be visualized in terms of risk (i.e. how close they are as a percentage to Bühlmann's original supersaturation limits). Also, this scale changes with depth, since the M-Value line also changes with depth.

Watch the video: Perdix Tissues Demo

Operations Manual Perdix 24 Manual DocRev A { TISSUES 16 tissue compartments

Inspired inert Increasing pressure M-Value gas pressure pressure Ambient pressure

Sample Tissues Graphs

TISSUES

On surface (sat. with air)

Note: Gas is 79% N2 (21% O2, or Air) TISSUES

After descent

TISSUES

On-gassing

TISSUES

Deep stop

TISSUES

Last deco stop

Note: Gas is now 50% O2 and 50% N2

Operations Manual Perdix 25 Manual DocRev A Gradient Factor: GF The deco conservatism value when the deco model is set to GF. The low and high gradient factors control the conservatism of the 30/85 Bühlmann GF algorithm. See “Clearing up the Confusion About Deep Stops” by Erik Baker.

VPM-B VPM-B (and VPM-BG): The deco conservatism value when the deco model is set to +3 VPM-B. VPM-BG If the deco model is VPM-B/GFS, also displays the gradient factor +3/90 for surfacing. Pressure: The pressure in millibars. Two values are shown, the surface (surf) PRESSURE mBar pressure and the current (now) pressure. The current pressure is only shown on the surface. SURF1013 NOW1011 The surface pressure is set when the Perdix is turned on. If the Altitude setting is set to SeaLvl, then surface pressure is always 1013 millibars.

TEMP Temperature: The current temperature in degrees Fahrenheit (when depth in 73F feet) or degrees Celsius (when depth in meters). Battery: BATTERY The Perdix’s internal battery voltage. Displays in Yellow when the 3.7V battery is low and needs replacement. Displays in Flashing Red LiIon 3.99V when the battery is critically low and must be replaced as soon as possible. Also shows battery type.

DATE TIME DATE TIME Date and Time: 28-Jun-15 16:31 28-Jun-15 4:31pm In the format dd-mon-yy 12 or 24 hour clock time.

SERIAL NO VERSION Serial Number & Version: 1234ABCD 2000029 Each Perdix has a unique serial number. The version number indicates the available features. The last two numbers are the firmware version (V33 in this image).

Operations Manual Perdix 26 Manual DocRev A COMPASS

The Perdix model contains a tilt-compensated digital compass.

Compass features: 1° resolution ±5° accuracy Smooth, high-speed refresh rate User set heading marker with reciprocal True North (declination) adjustment Tilt compensation ±45°

Viewing the Compass When enabled, the compass is viewed by pressing the SELECT (right) button once. Press SELECT again to continue on to view the regular info screens.

Unlike the regular info screens, the compass never times out back to the main screen. Pressing the MENU (left) button brings up the Mark Heading option. Pressing MENU again returns to the main screen.

Watch the video: Compass Features

Operations Manual Perdix 27 Manual DocRev A Compass

Marking a Heading DEPTH TIME STOP TIME To mark a heading, when viewing the compass press the MENU (left) button. This brings up the 22.1 3 "Exit Mark" menu. Press the SELECT (right) GasPO2 button to mark the heading.

The marked heading is shown with a green .21 arrow. When within ±5° of the heading, the degrees display turns green. NE N The reciprocal heading (180° from marked Exit 28 Mark heading) is shown with a red arrow. When within ±5° of the reciprocal heading, the degrees display turns red.

When more than 5° off the marked heading, a green arrow shows the direction back to the marked heading. Also, the offset degrees to the heading are displayed (16° in the example image). This offset is useful when navigating patterns. For example, a box pattern requires turns at 90° intervals, while a triangle pattern requires 120° turns.

Operations Manual Perdix 28 Manual DocRev A COMPASS

It is important to understand some compass limitations before use.

Calibration: The digital compass needs occasional calibration. This can be done in the System Setup Compass menu and takes only one minute.

Battery Changes: When the battery is changed, the compass should be calibrated. This is because each battery has its own magnetic signature that interacts with the compass. Fortunately this effect can be removed with proper calibration.

Interference: Since a compass operates by reading the Earth's magnetic field, the compass heading is affected by anything that distorts that field or creates its own.

Ferromagnetic materials (such as iron, steel, or nickel) should be kept away from the Perdix when using the compass. A traditional compass should also not be placed too close, as it contains a permanent magnet. Electric motors and high current cabling (such as from dive lights) can also cause interference and should be kept at a distance. Being inside or near a shipwreck may also affect the compass heading.

Watch the video: Compass Calibration

Operations Manual Perdix 29 Manual DocRev A MENUS DEPTH TIME STOP TIME Press MENU (left) button to step through the menus.

220 22 130 1 Press SELECT (right) button to GasPO2 execute command or enter sub-menu.

1.15 Menus display on the bottom row. O2/HE NDL TTS OC 15/40 0 56

MENU button SELECT button Turn Off Perdix Turns Off MENU button SELECT button Enter Select Gas Select Gas sub-menu MENU... button

Menus perform actions and allow settings to be changed

Starting from the main screen, pressing the MENU (left) button steps through the menus. When all menus have been viewed, pressing MENU again will return to the main screen.

Pressing the SELECT (right) button when a menu is displayed, either performs that action or enters a sub-menu.

If no buttons are pushed for 1 minute, the menu system will time-out, returning to the main screen. Anything that had been previously saved will be retained. Anything that was in the middle of editing will be discarded.

ADAPTIVE MENUS Only menus necessary for the current mode are shown. This keeps operation simple, prevents mistakes, and reduces buttons presses.

Operations Manual Perdix 30 Manual DocRev A The following sections show the menu structure in various operating modes. OPEN CIRCUIT MENU STRUCTURE

Main Screen

Surface only Turn Off

Select Gas Sub-Menus

Conserv. Dive Setup+ Define Gas NDL Display Dive Planner+ Brightness

Surface only Dive Log+ Display Log Upload Log Edit Log Number

Surface only System Setup+ Mode Setup OC Gases Deco Setup Display Setup Center Row Compass System Setup Advanced Config

Operations Manual Perdix 31 Manual DocRev A CLOSED CIRCUIT (INT. PPO2) MENU STRUCTURE

Main Screen

Surface only Turn Off Switch .7 > 1.3 Select Gas

Switch CC > OC Sub-Menus

Dive Setup+ Edit Low SP Dive Planner+ Edit High SP Conserv. Define Gas NDL Display

Surface Brightness only Dive Log+ Display Log Upload Log Edit Log Number

Surface CC Gases only System Setup+ Mode Setup Deco Setup Auto SP Switch Center Row Display Setup OC Gases Compass System Setup Advanced Config

Operations Manual Perdix 32 Manual DocRev A SIMPLE EXAMPLE DIVE

Watch the video: Air - Dive

DEPTH TIME SURFACE DEPTH TIME STOP TIME DEPTH TIME STOP TIME DEPTH TIME STOP TIME 0 4hr39mn 30 1 110 3 120 8 20 1 GasPO2 GasPO2 GasPO2 GasPO2 .21 .4 .9 .97 O2/HE NDL TTS O2/HE NDL TTS O2/HE NDL TTS O2/HE NDL TTS OC 21/00 0 0 OC 21/00 99 1 OC 21/00 12 3 OC 21/00 0 7

Here is an example As we pass through The no-decompression We have now entered of a simple OC air 30 feet, the time- limit (NDL) starts decompression. Our dive. It will help to-surface (TTS) off showing 99, but first stop, or ceiling, is to introduce the shows one minute. then starts to show at 20 feet and we will screen displays as This shows that a smaller number as need to remain there the diver progresses, the computer is the depth increases. for up to one minute. the dive starts, the expecting the The 3rd screen shows Although stops are depth increases. The diver to ascend at that we will go into shown in minutes, display is showing approximately 33 deco in 12 minutes. the computer will the computer feet per minute or 10 calculate and change programmed for open meters per minute. the ceiling in real time circuit (OC) air. The dive predictions and the stop may be are based on this less than a minute. ascent rate.

DEPTH TIME STOP TIME DEPTH TIME STOP TIME DEPTH TIME STOP TIME 21 11 20 1 19 12 20 1 9 15 GasPO2 GasPO2 GasPO2 .34 .33 .27 O2/HE NDL TTS O2/HE NDL TTS O2/HE NDL TTS OC 21/00 0 2 OC 21/00 0 2 OC 21/00 99 0

As we ascend, the When we go shallower When we clear the last stop, the stop depth ascent rate indicator than our first stop, the and time goes blank, and now we see a shows about 20 fpm stop depth starts to NDL of 99 minutes again. Once we surface, or 6 mpm. flash red. the depth is 0 and a minute later when the computer comes out of dive mode, the NDL goes to 0 as well.

Operations Manual Perdix 33 Manual DocRev A COMPLEX EXAMPLE DIVE

Watch the video: Deco Dive

DEPTH TIME SURFACE DEPTH TIME SURFACE 0 0 GasPO2 GasPO2 1.2 1.2 O2/HE NDL TTS Calibrate CC 21/00 0 0

This is an example of the displays that might be seen on a dive. This example shows a complicated dive with multiple Closed Circuit (CC) gases and multiple Open Circuit (OC) bail-out gases. A normal, single gas CC or OC dive wouldn’t have any button pushes at all, so there isn’t much to show.

Operations Manual Perdix 34 Manual DocRev A Next, we check the closed circuit diluent gases that we have programmed. Entering the gas selection function by pressing SELECT with the “Select Gas” menu item showing will display the first CC gas that is available. MENU will increment to the next gas available. Another MENU takes us back to the “Select Gas” menu item. Those are the only two gases configured. We SELECT gas number 2, the Trimix 10/50.

DEPTH TIME STOP TIME DEPTH TIME STOP TIME DEPTH TIME STOP TIME 0 0 0 GasPO2 GasPO2 GasPO2 1.2 1.2 1.2 Set A1 CC 21/50 Set 2 CC 10/50 Select Gas Next Gas Select Cancel Select

The system will use both of these gases for our dive when calculating the TTS. It assumes a diluent switch at a PPO2 of 1.05. That means that it will assume that you have switched to an air diluent at 124 feet. This is only for the TTS prediction. The computer will always use the currently selected gas for tissue loading calculations.

Then we switch to open circuit to look at our bail-out gases. Flipping through the gases with MENU shows that we have three gases available. (Whether they are appropriate gases is a subject for one of the web forums.)

DEPTH TIME STOP TIME DEPTH TIME STOP TIME DEPTH TIME STOP TIME 0 0 0 GasPO2 GasPO2 GasPO2 1.2 1.2 1.2 Set A1 OC 99/00 Set 2 OC 50/20 Set 3 OC 14/55 Next Gas Select Cancel Select Cancel Select

Operations Manual Perdix 35 Manual DocRev A DEPTH TIME STOP TIME These are the gases that will be used to estimate TTS in the event 0 that you switch to open circuit during a dive. In OC mode, the GasPO2 computer will assume that you will switch gases when the PPO2 of 1.2 the next available gas is less than 1.6. Switch OC > CC Automatic decisions of when to switch gases for the TTS calculation means that it is very easy to set up your CC and OC gases. There is no need to enter a depth or a PPO2 to switch gas. DEPTH TIME STOP TIME Any gases that are turned on will be used in the decompression 0 calculation. GasPO2 1.2 If a gas is available in the CC gas list, (entered and turned on),it O2/HE NDL TTS will be used in CC, and it will be used at an appropriate depth. The CC 10/50 0 0 same is true for OC. It is always configured correctly if you are actually carrying the gases you have entered and turned on.

If it is necessary to switch to OC while diving, 4 button pushes will do it. You will be switched to OC and will be using the gas that has the highest PPO2 less than 1.61. Your OC gas list is likely very different from your diluent gas list, but you set it up before the dive so it is immediately available in the case of a bail-out. Now switch back to closed circuit and start the dive.

DEPTH TIME STOP TIME We have reached a depth now that will incur decompression 126 2 soon. The NDL is 8 minutes, and the TTS is 4 minutes. The TTS is GasPO2 showing the planned ascent time at 30 fpm. 1.2 O2/HE NDL TTS The computer has automatically switched to the high setpoint. CC 10/50 8 4 This can be disabled if automatic setpoint switching isn’t required.

DEPTH TIME STOP TIME 257 8 90 1 GasPO2 1.2 We are now at our maximum depth. Our first stop is at 90 feet. O2/HE NDL TTS CC 10/50 0 23

DEPTH TIME STOP TIME The diver is ascending to the 90 foot stop. Note the ascent rate 98 15 100 1 indicator showing a 20 fpm / 6 mpm ascent rate. The Perdix GasPO2 assumes a 30 fpm ascent rate in calculating the decompression 1.2 schedule. Since the diver ascended slower than predicted there is O2/HE NDL TTS now a 100 foot stop. CC 10/50 0 22

Operations Manual Perdix 36 Manual DocRev A DEPTH TIME STOP TIME 95 15 100 1 But the diver missed the stop, and has ascended to 95 feet. At this point, GasPO2 1.2 the stop depth and time is flashing red to show that the depth is above the O2/HE NDL TTS recommended stop. CC 10/50 0 22

DEPTH TIME STOP TIME The diver switches to the other programmed CC gas. Note that if you 95 15 90 1 change the diluent on the computer you must flush the loop to change GasPO2 1.2 the diluent in the loop. At the same time the 100 foot stop clears. It is O2/HE NDL TTS common for the first stops to clear in less than a minute. They mainly just CC 21/50 0 22 slow down the ascent.

DEPTH TIME STOP TIME 60 19 60 1 GasPO2 At 60 feet a problem develops that causes the diver to bail out to open 1.2 circuit. The first push on MENU brings up Select Gas. Select Gas

DEPTH TIME STOP TIME 60 19 60 1 The second push brings up Switch CC > OC. A push on SELECT does GasPO2 the switch. 1.2 Note that OC displays in Yellow to clearly indicate that this is a OC Switch CC > OC bailout condition.

DEPTH TIME STOP TIME 60 19 60 1 The system has switched the gas set from the closed circuit gas set to the GasPO2 1.2 open circuit gas set, picked the gas with the highest PPO2 less than 1.6, and O2/HE NDL TTS recalculated the decompression based on the new profile. OC 50/20 0 36

DEPTH TIME STOP TIME 20 25 20 3 GasPO2 At 20 feet, one push on MENU brings up select gas. 1.2 O2/HE NDL TTS Select Gas

DEPTH TIME STOP TIME A push on SELECT enters the select gas menu, and another SELECT 20 25 20 3 picks the O2. Since the gases are sorted by oxygen content, the O2 is the GasPO2 first gas offered. 1.2 Set 1 OC 99/00 This was a multi-gas trimix dive with a multi-gas open circuit bailout, and it Cancel Select required 9 button pushes.

Operations Manual Perdix 37 Manual DocRev A GAUGE MODE

Gauge Mode turns the Perdix into a simple depth and time display SURFACE (a.k.a. a bottom timer). 0ft 2hr35mn MAX Change to Gauge Mode in the System Setup Dive Setup menu. 0ft AVG Since decompression tissues are not tracked in Gauge Mode, changing to or from Gauge Mode resets the deco tissues. 0ft 72F 8:14 AM Gauge - Surface Display Features: Extra-Large Depth Display (in feet or meters) Extra-Large Time Display (in minutes:seconds) :16 Maximum and Average Depth on main screen. 128ft 21 Stopwatch MAX Resettable Average Depth 157ft AVG The Gauge display is organized as: Depths along the left. 74 ft 72F 8:35AM Times along the right. Gauge - Dive Display Most important information (Depth, Dive Time) on the top row.

STOPWATCH :16 When diving, starting or stopping the Stopwatch is the first ft 128 21 menu option. MAX STOPWATCH 157ft 2:56 When stopped, the word “Stopwatch” displays in red. AVG 74 ft 72F 8:35AM When non-zero, the stopwatch can be reset. Reset behavior depends on state: Stopwatch Running If running when reset, it continues running, counting up again from 0. If stopped when reset, then it is set 0 and remains stopped. :16 128ft 21 MAX STOPWATCH RESETTABLE AVERAGE DEPTH 157ft 2:56 AVG During a dive, the average depth can be reset. 74 ft 72F 8:35AM While on the surface, the MAX and AVG values display the Stopwatch Stopped maximum and average depth of the last dive. The AVG depth displayed on the surface is for the entire dive, regardless of whether the reset average depth option was used. The dive log also records the average depth for the entire dive.

Operations Manual Perdix 38 Manual DocRev A DECOMPRESSION AND GRADIENT FACTORS The basic decompression algorithm used for the computer is Bühlmann ZHL-16C. It has been modified by the use of Gradient Factors that were developed by Erik Baker. We have used his ideas to create our own code to implement it. We would like to give credit to Erik for his work in education about decompression algorithms, but he is in no way responsible for the code we have written.

The computer implements Gradient Factors by using levels of conservatism. The levels of conservatism are pairs of number like 30/70. For a more detailed explanation of their meaning, please refer to Erik Baker’s excellent articles: Clearing Up The Confusion About “Deep Stops” and Understanding M-values. The articles are readily available on the web. You might also want to search for “Gradient Factors” on the web.

The default of the system is 30/70. The system provides several settings that are more aggressive than the default.

Don’t use the system until you understand how it works.

Operations Manual Perdix 39 Manual DocRev A Graph from Erik Baker’s “Clearing Up The Confusion About Deep Stops”

Pressue Graph: Gradient Factors

100% 80% 60% 40% 20% 0% y

M-value Gradient

GF Lo generates first stop Surface Pressure Surface

M-value Line Linear function for gradual change in Gradient Factors

Ambient Pressue Line Compartment inert gas pressure, absolute inert gas pressure, Compartment

GF Hi (surfacing value) First maintains safety margin Stop 0 0 x Ambient Pressure, absolute (increasing depth > )

A Gradient Factor is simply a decimal A Gradient Factor of 100% represents the fraction (or percentage) of the M-value M-value line. Gradient. Gradient Factors modify the original Gradient Factors (GF) are defined from 0% M-value equations for conservatism within to 100%. the decompression zone.

A Gradient Factor of 0% represents the The lower Gradient Factor value (GF Lo) ambient pressure line. determines the depth of the first stop. Used to generate deep stops to the depth of the "deepest possible deco stop"

Operations Manual Perdix 40 Manual DocRev A MENU REFERENCE

DEPTH TIME STOP TIME 0 GasPO2 v 1.2 Turn off

TURN OFF The “Turn Off” item puts the computer to sleep. While sleeping, the screen is blank, but the tissue contents are maintained for repetitive diving. The “Turn Off” menu item will not appear during a dive on any model. It will also not appear after a dive until the End Dive Delay Time has expired to allow for a continuation dive.

Operations Manual Perdix 41 Manual DocRev A DEPTH TIME SURFACE DEPTH TIME SURFACE 0 0 .7 1.3 O2/HE NDL TTS Switch .7 > 1.3 CC 10/50 0 22

SWITCH SETPOINT This menu is only available in CC mode.

The internal PPO2 mode is used to calculate decompression for a unconnected rebreather. In this case, the setpoints are switched in the computer to approximate the rebreather setpoint.

During a dive the “Switch Setpoint” menu item will be the first item displayed, since the “Turn Off” displays are disabled when diving.

Pressing SELECT when this menu is displayed changes the PPO2 setpoint from the low setpoint to the high setpoint or vice-versa. To redefine the PPO2 value of a setpoint, use the Dive Setup menu.

This menu item performs a manual switching of PPO2 setpoint. In the System Setup Auto SP Switch menu, the Perdix can be setup to automatically perform setpoint switches at programmable depths. When auto setpoint switches are enabled, this menu item is still available to provide manual control.

Operations Manual Perdix 42 Manual DocRev A SELECT GAS This menu item allows you to pick a gas from the gases you have created. The selected gas will be used either as the breathing gas in open circuit mode, or the diluent in closed circuit mode.

Gases are always sorted from most to least oxygen content.

DEPTH TIME SURFACE DEPTH TIME SURFACE 0 0 GasPO2 GasPO2 1.2 1.2 A1 CC On 21/00 Select Gas Next Gas Select

Use the MENU button to If you increment past the increment to the desired number of gases available, the diluent/gas, then press the display will fall back out of the SELECT button to select that “Select Gas” display without diluent/gas. changing the selected gas.

An ‘A’ will appear next to the currently active gas.

DEPTH TIME SURFACE DEPTH TIME SURFACE 0 0 GasPO2 GasPO2 1.2 1.2 2 CC On 10/50 2 CC Off 10/50 Next Gas Select Next Gas Select

A gas that is off will be shown in Magenta, but can still be selected. It will be turned on automatically if it is selected. Off gases are not used in decompression calculations.

Watch the video: New Gas Select Style

Operations Manual Perdix 43 Manual DocRev A RADIO STATION GASES

For computer models that support open circuit and closed circuit operation, the system maintains two sets of gases - one for open circuit and one for closed circuit.

The way they operate is very similar to the way car radios work with AM and FM stations.

When you are listening to an FM station and you push a station selection button, it will take you to another FM station. If you add a new station, it will be an FM station.

Similarly, if you are in the AM mode, adding or deleting a station would add or delete an AM station.

With radio station gases, when you are in open circuit, adding, deleting or selecting a gas will refer to an open circuit gas. Just like the FM stations are selected when your radio is in FM mode, the closed circuit gases are available in the closed circuit mode. When you switch to open circuit, the gases available will be open circuit gases.

Operations Manual Perdix 44 Manual DocRev A Adv. Config 1 Title Color Cyan End Dive Delay 060s Bat Icon Always Gas Select Classic

Change Save DEPTH TIME STOP TIME 21.4 22 21 2 Classic Select Gas GasPO2 .66 2 OC On 50/00 Next Gas Select

Two styles of Select Gas menus are available, Classic and New.

Change between the two styles in the Adv. Config 1 menu.

Classic Style Select Gas

The classic Select Gas style is as described on the previous page. One gas is shown at a time. Press MENU to step through gases, and SELECT to select the shown gas. Gases are sorted from highest O2% to lowest O2%. Stepping past the last gas will exit the menu without changing the active gas. Upon entering the Select Gas menu, the first gas shown is always the highest O2% gas.

Operations Manual Perdix 45 Manual DocRev A DEPTH TIME STOP TIME DEPTH TIME STOP TIME DEPTH TIME STOP TIME 21.4 22 21 2 21.4 22 21 2 21.4 22 21 2 GasPO2 GasPO2 GasPO2 1.10 .66 .66 99/00 50/00 35/30 99/00 50/00 21/00 99/00 50/00 21/00 20/40 10/50 Next Select Next Off Select Next Active Select

New Style Select Gas Off Gases are Magenta Active Gas is White

New Style Select Gas

The new style makes visualizing the gas list easier. It also reduces button presses for deco gas switches.

Shows all gases on the screen at once. Press MENU to step through gases, and SELECT to select the pointed to gas. A gas must be selected to exit the menu (scrolling past last gas wraps back to first gas). The active gas is shown with a white background. Turned off gases are shown in Magenta (purple). Gases are sorted from highest O2% to lowest O2%. When diving and there is a deco stop, the first gas pointed to will be the most appropriate gas (highest PPO2 less than 1.61). This reduces button presses in most cases. On the surface or when no deco stops are needed, the first gas pointed to will be the active gas.

Operations Manual Perdix 46 Manual DocRev A DEPTH TIME SURFACE SWITCH TO CC/BO 0 2hr45mn Depending on the current computer setting, this selection will show as either “Switch CC > OC” or “Switch OC > CC”.

Pressing SELECT will select the displayed mode for decompression Switch CC > OC calculations. When switching to open circuit while diving, the most DEPTH TIME SURFACE appropriate open circuit gas will become the breathing gas for calculations. 0 2hr45mn .85 .86 .84 At this point, the diver may want to switch to a different gas, but since the diver may have other things to deal with, the computer will make a “best Switch OC > CC guess” of which gas the diver would choose.

DEPTH TIME SURFACE 0 2hr45mn You can also switch to from CC to OC on a fixed PPO2 model. In that 1.3 case, the computer will use the user entered high and low setpoints. Switch CC > OC

DEPTH TIME SURFACE DIVE SETUP+ 0 2hr45mn GasPO2 1.2 The Dive Setup menus are available both on the surface and when diving. The values in Dive Setup+ can also be accessed in the Systems Setup+ Dive Setup+ menu, but the System Setup+ menu is not available when diving.

DEPTH TIME SURFACE Pressing SELECT will enter the Dive Setup sub-menu. 0 2hr45mn GasPO2 CC/BO ONLY 1.2 Edit Low SP 0.7 NEXT EDIT

DEPTH TIME SURFACE LOW SETPOINT 0 2hr45mn This item allows you to set the low setpoint value. It will display the GasPO2 currently selected value. Values from 0.4 to 1.5 are allowed. 1.2 A press of MENU will increment the setpoint. Edit Low SP 0.4 Change Save Press the SELECT button when “Edit Low SP” is displayed and the edit display will be shown. It is set at the lowest valid value for setpoint, .4.

Operations Manual Perdix 47 Manual DocRev A DEPTH TIME SURFACE 0 2hr45mn GasPO2 Another press of MENU 1.2 will increment it again. Edit High SP 1.3 Next Edit

DEPTH TIME SURFACE If SELECT is pushed, the currently displayed setpoint will be selected, 0 2hr45mn and the display will GasPO2 return to the “Edit Low SP” menu item.

1.2 If the highest allowable value, 1.5, has been Edit Low SP 0.5 passed, the value will Change Save return to 0.4.

DEPTH TIME SURFACE 0 2hr45mn HIGH SETPOINT GasPO2 The high setpoint function works exactly like the low setpoint 1.2 function. Edit Low SP 1.5 Next Edit

Operations Manual Perdix 48 Manual DocRev A DEFINE GAS

DEPTH TIME STOP TIME The function allows you to set up 5 gases in Closed Circuit and 5 gases in Open Circuit. You must be in 0 Open Circuit to edit open circuit gases, and you must GasPO2 be in Closed Circuit to edit closed circuit diluents. For each gas, you can select the percentage of 1.2 oxygen and helium in the gas. The remainder is Define Gas assumed to be nitrogen. Next Define

DEPTH TIME STOP TIME 0 GasPO2 Pushing SELECT when “Define Gas” is displayed 1.2 presents the function to define gas number 1. 1 OC On 99/00 Next Gas Edit

DEPTH TIME STOP TIME 0 GasPO2 Pushing the MENU button will display the next gas. 1.2 2 OC On 50/00 Next Gas Edit

DEPTH TIME STOP TIME

0 Pushing SELECT will allow you to edit the current GasPO2 gas. The gas contents are edited one digit at a time. 1.2 The underline will show you the digit being edited. 2 OC On 50/00 Change Next

DEPTH TIME STOP TIME

0 Each push of the MENU button will increment the GasPO2 digit being edited. When the digit reaches 9, it will 1.2 roll over to 0. 2 OC On 50/00 Change Next

Operations Manual Perdix 49 Manual DocRev A DEPTH TIME STOP TIME 0 GasPO2 Pushing SELECT will lock in the current digit, and 1.2 move on to the next digit. 2 OC On 50/00 Change Next

DEPTH TIME STOP TIME Pushing SELECT on the last digit will finish editing 0 that gas, and bring you back to the gas number. GasPO2 1.2 Any gases that have both oxygen and helium set to 2 OC On 50/00 00 will not be displayed in the “Select Gas” function. Change Save

DEPTH TIME STOP TIME 0 GasPO2 Pushing MENU will continue to increment the 1.2 gas number. A3 OC On 14/55 Next Gas Edit

DEPTH TIME STOP TIME Note: The “A” denotes the active gas. You cannot 0 delete the active gas. If you try, it will generate an GasPO2 error. You can edit it, but cannot set both the O2 1.2 and HE to 00. The computer will display all 5 gas entries available 2 OC On 50/00 to allow you to enter new gases. Change Save

DEPTH TIME STOP TIME

0 Pressing MENU one more time when the fifth gas is GasPO2 displayed will return you to the “Define Gas” menu 1.2 item. 5 OC On 00/00 Done Edit

Operations Manual Perdix 50 Manual DocRev A WARNING

ONLY TURN-ON GASES YOU ARE CARRYING

Only turn on the gases you are actually carrying on the dive. With radio station gases, the computer has a full picture of the OC and CC gases you are carrying and can make informed predictions about decompression times. There is no need to turn gases off and on when you switch from CC to OC, because the computer already knows what the gas sets are. You should have the CC and OC gases you are actually carrying turned on.

If you often use other gases, but not on this dive, you can enter the gas and turn it off. You can turn gases on and off during a dive and you can also add or remove a gas during the dive if needed.

Operations Manual Perdix 51 Manual DocRev A DIVE PLANNER+

Introduction

Calculates decompression profiles for simple dives. In closed-circuit (CC) mode, also calculates open-circuit (OC) bail-out (BO).

Setup

Uses the current gases programmed into the Perdix, as well as the current GF low/high settings. VPM-B dive planning is available on units with the optional VPM-B unlock. Deco profile is computed for the current circuit mode (CC or OC).

On the surface Depth Time RMV PO2 Enter the dive bottom depth, bottom time, CC 150 030 .25 1.3 respiratory minute volume (RMV) and PPO2 Enter Bottom Time (closed-circuit only). in minutes Min: 5 Note: Residual tissue loading (and CNS%) from Max:180 recent dives will be used in calculating the profile. Change Next During a dive Dive Plan Setup

Computes the decompression profile assuming the ascent will begin immediately. There are no settings to enter. (RMV is last used value)

Limitations

The Perdix Dive Planner is intended for simple dives. Multi-level dives are not supported.

The Perdix Dive Planner makes the following assumptions:

Descent rate is 60ft/min (18m/min) and the ascent rate is 33ft/min (10m/min). For OC, the gas in use will be the gas with the highest PPO2 less than 1.40 for the bottom gas, and 1.61 for deco gases (the deco gas max PPO2 can be changed in the Adv Config 1 menu). For CC, the gas in use will be the gas with the highest PPO2 less than 1.05. The planner will use the configured last stop depth. For CC, the PPO2 is constant for the entire dive. The RMV is the same while diving as during deco.

Operations Manual Perdix 52 Manual DocRev A The Dive Planner does not provide thorough validation of the profile. For example, it does not check for nitrogen narcosis limitations, gas usage limitations, CNS percentage violations, or isobaric counter-diffusion risks due to sudden helium switches. The user is responsible for ensuring a safe profile is followed.

Result screens

The results are given in tables showing:

Stp: Stop Depth In feet (or meters) Tme: Stop Time In minutes Run: Run Time In minutes Qty: Gas Quantity in CuFt (or liters). OC and BO only

The first few rows will show the bottom time (bot) and the ascent legs (asc) to ascend to the first stop. Multiple ascent legs may be shown if gas switches are needed.

Depth Time RMV PO2 Depth Time RMV PO2 CC 150 030 .55 1.3 BO 150 030 .55 1.3 Stp Tme Run Gas Stp Tme Run Gas Qty 150 bot 30 10/50 30 5 43 36/00 6 70 asc 32 10/50 20 6 49 99/00 6 70 1 33 10/50 10 11 60 99/00 8 60 2 35 10/50 50 1 36 10/50 Quit Next Quit Next

Example Results Table for Closed-Circuit and Bailout.

If more than 5 stops are needed, the results will be split onto on several screens. Use the right button to step through the screens.

For OC or BO profiles, a total gas consumption report is given.

Depth Time RMV PO2 BO 150 030 .55 1.3 Gas Usage. In CuFt 99/00: 14 36/00: 14 21/25: 7 12/50: 0 Quit Next Gas Usage Report

Operations Manual Perdix 53 Manual DocRev A The final result screen shows the total dive time, the time spent on deco and final CNS%.

Depth Time RMV PO2 CC 150 030 .55 1.3 CC Summary Run: 61 minutes Results Summary Screen Deco: 31 minuntes CNS: 34%

Quit Plan BO

If no decompression is required, no table will be shown. Instead, the total No-Decompression-Limit (NDL) time in minutes, at the given bottom depth will be reported. Also, the gas quantity required to surface (bailout in CC) will be reported.

Depth Time RMV PO2 CC 150 030 .55 1.3 No Deco Stops. Total NDL at 80ft is 47 minutes No Decompression Results Screen Bailout gas quantity is 4 CuFt. Quit Done

CONSERVATISM The conservatism settings (GF High and GF Low) can be edited in the Dive Setup menu. While diving, only the GH High value can be edited. This allows changing the surfacing conservatism during a dive. For example, if you worked much harder on the bottom segment than expected, you may wish to add conservatism by reducing the GF High setting

DEPTH TIME STOP TIME 0 .85 .7 .84 Conserv 30/70 Next Edit

Operations Manual Perdix 54 Manual DocRev A NDL DISPLAY The NDL Display option allows you to display four different values during the dive. The display can be changed during the dive to provide different information. The value selected here replaces the NDL on the main screen once decompression stops are required.

1 NDL 2 CEIL 3 Buhlmann 4 @+5

DEPTH TIME STOP TIME 1 Pushing SELECT will make the NDL display editable. The first choice available will be NDL. If 0 you select NDL, the NDL will always be displayed GasPO2 during the dive whether or not you have a 1.2 decompression ceiling. NDL Display NDL Next Edit

DEPTH TIME STOP TIME 2 The next selection is CEIL. With this setting, as long as the NDL time is 0 (you have a decompression 0 ceiling), the raw ceiling will be displayed instead GasPO2 of the NDL. This is the equivalent of the ‘Man on a rope’. It will show your ceiling without it being 1.2 rounded up to the next even 10 foot or 3 meter stop. NDL Display NDL Please note that there is very limited information on Change Save the effects of following a continuous ceiling instead of stopping at stops and only moving up to the next stop when the stop has cleared.

It is the Shearwater's opinion that all stops should DEPTH TIME STOP TIME be honored. It seems intuitive that if you have bubbles, and you stop, you give the bubbles an 0 opportunity to be resorbed. If you continuously GasPO2 ascend, the ambient pressure is continuously reduced which prevents bubbles from shrinking. 1.2 Because of this belief, the computer will give one NDL Display CEIL MISSED DECO STOP message during the dive and one after the dive, and will flash the stop depth Change Save and time in red as long as you are above the stop depth. It will use the increased gradient though, and your calculated off-gassing will be faster than staying at the stops.

Operations Manual Perdix 55 Manual DocRev A DEPTH TIME STOP TIME 3 The next option is to display the actual supersaturation gradient for a pure Bühlmann 0 (99/99) profile. GasPO2 The selection is GF99. With this setting, as long 1.2 as the NDL time is 0 (you have a decompression NDL Display GF99 ceiling), the gradient will be displayed instead of the NDL. Change Save The number shown is the percentage of DEPTH TIME STOP TIME supersaturation. The number is calculated by 34.7 15 24 1 reference to the Ambient Pressure Line and the GasPO2 M-Value line. It can be thought of as the current 1.2 GF, but it is different in a couple of ways. First, the O2/HE GF99 TTS current GF generates stops rounded to the nearest 10 feet or 3 meters. So a gradient of 40 may reflect CC 10/50 12 42 a ceiling of 15 feet, but the computer will show a rounded-up 20 foot stop.

This number can be used in several ways. First, it can be used to calculate an aggressive ascent that still has some justification in decompression science. For example, if a diver were to lose a significant portion of their gas and needed to get shallow fast, they could ascend until they reached a gradient of 90, then stop until it dropped to 80, Pressure Graph: Gradient Factors then ascend to 90 again, etc. That would produce a 1 .8 .6 .4 .2 0 Bühlmann-like profile with very little conservatism. y In an emergency, that may be an acceptable risk. M-value Gradient Another use might be to do a slower ascent on a dive to sightsee, but to stay in the decompression GF Lo zone by keeping the gradient above 0. generates first stop Another use would be to observe the rapidly Surface Pressure Surface increasing gradient in the last 10 feet to the surface

M-value Line Linear and slow that ascent. function for gradual change in All of this is based on gradient theory that may be Gradient Factors completely false. There is significant disagreement in the decompression research community about Ambient Pressue Line Compartment inert gas pressure, absolute inert gas pressure, Compartment the nature and practice of decompression. Any GF Hi (surfacing value) First maintains safety margin Stop techniques described here should be considered 0 experimental, but the concepts may be useful to 0 x Ambient Pressue, absolute the advanced diver.

Operations Manual Perdix 56 Manual DocRev A DEPTH TIME STOP TIME 4 The last selection is @+5. This feature was inspired by Dan Wible’s CCR2000 computer (Thanks Dan!) 0 It is the time-to-surface (TTS) if you were to stay at GasPO2 the current depth for five more minutes. This can be used as a measure of how much you are on- 1.2 gassing or off-gassing. NDL Display @+5 For example, on a dive on a wreck, you go to Change Save the bottom until you accumulate the desired decompression and TTS. After ascending to the second deck, you notice that the @+5 and TTS are the same. That means that you can spend 5 minutes exploring this deck without incurring more decompression.

Once you get to the top deck, the current has picked up. The line runs from the top of the deck to the surface which is a distance of 30 feet/10 m. You see that your @+5 is 11 minutes and your TTS is 15 minutes. That means that you can stay down out of the current for 5 minutes and burn off about 4 minutes of deco. You may decide to accept the 80% decompression efficiency and stay out of the current.

When your TTS is 10 minutes, you see that your @+5 is 9 minutes. Since the decompression is not very efficient now, you go up the line and spend the last 10 minutes in the current.

Operations Manual Perdix 57 Manual DocRev A BRIGHTNESS DEPTH TIME STOP TIME 0 GasPO2 1.2 Brightness Auto Exit Edit

The display brightness has three fixed brightness settings plus an Auto mode.

The fixed options are:

Low: Second longest battery life. Med: Best mix of battery life and readability. High: Easiest readability, especially in bright sunlight.

Auto will use the light sensor to determine the brightness of the display. The more ambient light there is, the brighter the display will get. At depth, or in dark water, very little brightness is needed to see the display.

The Auto setting works well in most situations.

The brightness of the display is the major determinant of battery life. Up to 80% of the power consumption is to power the display. When a low battery alert occurs, the display brightness is automatically reduced to extend battery life.

Operations Manual Perdix 58 Manual DocRev A DIVE LOG MENU

Watch the video: Dive Log

DEPTH TIME STOP TIME DISPLAY LOG 0 GasPO2 At the “Display Log” prompt, press SELECT to view the most 1.2 recent dive.

Dive Log The profile of the dive is plotted in blue, with decompression stops plotted in red. The following information is displayed: DEPTH TIME STOP TIME 0 GasPO2 Maximum and Average depth 1.2 Dive number Display Log Date (dd/mon/yyyy) Next Display Start - Time of day dive started End - Time of day dive ended DIVE# 27 08-Aug-2015 Oft Length of dive in minutes

339ft 6min Press MENU to see the next dive, or SELECT to quit viewing logs. Max 339ft Start 5:43pm Avg 118ft End 5:49pm Press Back to see the list of dive logs, and next to select the next Back dive and View.

UPLOAD LOG See “Dive Log Download” instructions.

Logs are uploaded using Bluetooth. Selecting this menu item starts the Bluetooth connection and then waits for commands from a Initializingdesktop or laptop computer. DEPTH TIME STOP TIME EDIT LOG NUMBER 0 GasPO2 The dive log number can be edited. This is usefulCancel if you want the 1.2 Perdix log numbers to match your lifetime dive count. Edit Log Number Next Exit At the “Edit Log Number” prompt, press SELECT to begin editing.

DEPTH TIME STOP TIME While editing, use MENU to change the value of the currently 0 underlined digit, and SELECT to move to the next digit. GasPO2 1.2 The next dive number will be +1 from the value entered here. Log Number= 0000 For example, if you enter 0015, then the next dive will be dive Next Exit number 16.

Operations Manual Perdix 59 Manual DocRev A IMPORTANT INFORMATION FOR OPEN CIRCUIT DIVERS

All Perdix models include Closed Circuit (CC) functionality.

Leaving CC mode enabled makes the Perdix more complex and less optimized for OC diving.

Switch Mode from CC/BO to OC Tec or OC Rec before performing an open circuit only dive.

Also, when CC mode is available, then OC is treated as bailout. This is why OC is shown as a yellow warning when CC mode is available.

Operations Manual Perdix 60 Manual DocRev A SYSTEM SETUP+ DEPTH TIME STOP TIME 0 GasPO2 1.2 System Setup+

System Setup contains configuration settings together in a convenient format for updating the configuration before a dive.

System setup cannot be accessed during a dive.

However, many of the settings are also available during the dive in a single line interface. Although all of the settings available in Dive Setup are available in System Setup, not all settings in System Setup can be edited in Dive Setup.

The MENU and SELECT buttons are context sensitive to each sub menu and individual setting. Example Menu Example Menu Example 0.00 Example 0.00 Example 0.00 Example 0.00 Example 0.00 Example 0.00 Example 0.00 Example 0.00 Example 0.00 Example 0.00 Next Edit Change Next When cycling through the sub-menus, MENU will carry the user to the next sub-menu, while SELECT will allow the user to edit the options in this submenu.

Once the user has pressed SELECT to edit a submenu, MENU will cycle the user through the different submenu listings, while SELECT will let the user edit those listings.

Once the user has pressed SELECT to edit a submenu listing MENU will be used to change the context sensitive variable, while the SELECT button will be used to move to the next field. Once the user has pressed SELECT through all the fields, the new user preferences will be saved.

Operations Manual Perdix 61 Manual DocRev A MODE SETUP The first submenu of System Setup+ is Mode Setup. Mode Setup Mode OC/CC Salinity Fresh PPO2 Mode Int. Low SP 0.7 High SP 1.3 Next Edit

Mode

Mode sets which breathing circuit configurations are available: CC/BO (default) OC Tec OC Rec Gauge (e.g. bottom timer mode)

When changing to or from Gauge mode, the decompression tissues are cleared. This is because when in Gauge mode the Perdix does not know what gas you are breathing, , and therefore cannot track inert gas loading.

Salinity

Water type (salinity) affects how the measured pressure is converted to depth. Settings: Fresh EN13319 Salt

Freshwater and Saltwater differ by about 3%. Saltwater, being denser, will display a shallower depth for the same measured pressure versus the Fresh setting.

The EN13319 value is between Fresh and Salt. It is from the European CE standard for dive computers, and is the Perdix’s default value.

Operations Manual Perdix 62 Manual DocRev A Mode Setup Mode OC/CC Salinity Salt PPO2 Mode Int. Low SP 0.7 High SP 1.3 Next Edit

PPO2 Mode

PPO2 mode is only set when CC is enabled.

On the Perdix this value is always Int (internal fixed PPO2).

Low and High Setpoints

The Low and High PPO2 Setpoints are only available when CC is enabled.

Each setpoint can be set from 0.4 to 1.5.

The setpoints can also be edited, even during a dive, in the Dive Setup menu.

Operations Manual Perdix 63 Manual DocRev A Deco Setup DECO SETUP Deco Model GF Deco Model Conserv (GF) 30/70 May just show Bühlmann ZHL-16 with gradient factors model, or it Last Stop 6m may allow you to switch between GF and various types of VPM-B. NDL Display CEIL The choices will be available if you have unlocked VPM-B.

Conservatism Next Edit Can be adjusted in either the GF or VPM model. For a more detailed explanation of their meaning for the GF algorithm, please refer to Erik Baker’s excellent articles: Clearing Up The Confusion About “Deep Stops” and Understanding M-values. The articles are readily available on the web. VPM-B has conservatism settings from 0 to +5, with higher numbers being more conservative.

Last Stop Allows you to choose where to do your last stop. The choices are 10ft/3m and 20ft/6m. Note that this setting does not affect decompression. It only makes the TTS prediction more accurate.

NDL Display These options were previously covered in the Dive Setup+ section.

OC GASES OC Gases The next submenu is OC Gases. This menu allows the user to edit 1 OC On 21/00 the open circuit gases. The options contained here are the same as 2 OC Off 00/00 those in the “Define Gases” subsection of the “Dive Setup” section 3 OC Off 00/00 contained earlier in this manual. This menu page conveniently 4 OC Off 00/00 displays all five gases simultaneously. 5 OC Off 00/00 Next Edit For a description of how to appropriately set each gas, please see the earlier Define Gas section.

CC GASES CC Gases The next submenu is CC Gases. This menu allows the user to edit A1 CC On 21/00 the closed circuit diluent gases. The options contained here are 2 CC Off 00/00 the same as those in the “Define Gases” subsection of the “Dive 3 CC Off 00/00 Setup” section contained earlier in this manual. This menu page 4 CC Off 00/00 conveniently displays all five gases simultaneously. 5 CC Off 00/00 Next Edit For a description of how to appropriately set each gas, please see the earlier Define Gas section.

Operations Manual Perdix 64 Manual DocRev A Auto SP Switch AUTO SP (SETPOINT) SWITCH Up: 0.7>1.3 Auto This menu page is only available in CC mode when Up Depth 070ft PPO2 mode is set to internal (see Dive Setup page).

Down: 1.3>0.7 Auto Auto Setpoint Switch configuration sets up the setpoint Down Depth 040ft switching. It can be set up to auto switch up only, down Next Edit only, both, or neither. First, you set whether the “Up” switch occurs automatically or manually. If “Up” is set to “Auto”, then you can set the depth at which the auto switch occurs.

The menu options are the same for the down setpoint switch. Auto SP Switch Example: Up: 0.7>1.3 Auto Up: 0.7 > 1.3 = Auto, Up Depth = 70 ft. Up Depth 070ft Down: 1.3 > 0.7 = Auto, Down Depth = 41ft The dives starts at the 0.7 setpoint. As you descend past Down: 1.3>0.7 Auto 70ft, the setpoint switches “up” to 1.3. Down Depth 041ft Change Next You finish your bottom time, then begin ascending. When you ascend above 41ft, it switches “down” Auto SP Switch to 0.7. Up: 0.7>1.3 Auto When a switch is set to “Auto”, you can always manually Up Depth 070ft override the setting at any time during the dive.

Down: 1.3>0.7 Manual The automatic switches only occur when crossing the specified depth. Say for example, the switch up depth is Change Save set to 50ft. You start the dive on the low setpoint, then as you descend past 50ft, the setpoint automatically switches up to high. If at say 80ft you then manually switch back to the low setpoint, the setpoint will remain low. If you ascend shallower than 50ft then re-descend deeper than 50ft again, the automatic setpoint switch will occur again. The Perdix enforces a 20ft (6m) gap between switch up and switch down depths to prevent rapid automatic switching between setpoints for small depth changes. The values 0.7 and 1.3 are shown as examples only. Other values for the low and high setpoint can be adjusted in the Dive Setup menu.

Operations Manual Perdix 65 Manual DocRev A DISPLAY SETUP Display Setup Units Feet Brightness Auto Altitude SeaLvl Flip Screen

Next Edit

Units Two options are available:

Feet: Imperial units (depth in feet, temperature in °F) Meters: Metric units (depth in meters, temperature in °C)

Display Setup Display Setup Units Feet Units Feet Brightness Med Brightness Auto Altitude SeaLvl Altitude SeaLvl Flip Screen Flip Screen

Change Save Change Save

Brightness Screen brightness can be set to fixed levels or an automatic setting.

Fixed options: Cave: Made specifically for cave conditions. Longest battery life. Low: Second longest battery life. Med: Best mix of battery life and readability. High: Easiest readability, especially in bright sunlight.

The “Auto” option measures ambient light levels and then adjusts the screen brightness to best performance. It provides maximum brightness in bright sunlight, but then lowers brightness to save battery life when the environment gets darker.

Operations Manual Perdix 66 Manual DocRev A Altitude The altitude setting when set to ‘Auto’ will compensate for pressure changes when diving at altitude. If all your diving is at sea level, then setting this to ‘SeaLvl’ will assume that surface pressure is always 1013 mBar (1 atmosphere). Display Setup Display Setup Units Feet Units Feet Brightness Auto Brightness Auto Altitude Auto Altitude SeaLvl Flip Screen Flip Screen

Change Save Change Save

If the Perdix measures the surface pressure to be less than 965 mbar, then the Altitude setting will be forced to "Auto" and cannot be changed.

DETERMINATION OF SURFACE PRESSURE

Accurate depth measurements and decompression calculations require knowing the ambient atmospheric pressure at the surface. Regardless turn on method, the surface pressure is determined the same way. While in the off state the surface pressure is measured and saved every 15 seconds. A 10 minute history of these pressure samples is kept. Immediately after turn-on this history is examined and the minimum pressure is used as the surface pressure. The surface pressure is then remembered, and not updated again until the next turn-on.

Operations Manual Perdix 67 Manual DocRev A

Flip Screen Flip

This function displays the contents of the screen upside Exit

Flip Screen Flip ‣

down. Altitude SeaLvl

Brightness Auto

Units Feet

Display Setup Display The Flip Screen is of limited use on the Perdix model, but can be used if you wish to wear the Perdix such that the button are on the top of the device.

In the normal orientation, buttons are at the bottom of the display. If you flip the display, the buttons will be up top when the Perdix is worn on the wrist.

Operations Manual Perdix 68 Manual DocRev A COMPASS SETUP Compass Compass View 90 Calibrate True North +0

Next Edit

Compass View The Compass View setting can be set to:

Off: The compass is disabled.

60°, 90°, or 120°: Sets the range of the compass dial that is visible on the main screen. The actual amount of arc that there is room for on the screen is 60°, so this may feel the most natural. The 90° and 120° settings allow a wider range to be seen at once. The default is 90°.

Compass Compass View 90 Calibrate True North +0

Next Edit

True North In most places, a compass does not point towards True North, but rather to Magnetic North. The difference in angle between these two directions is called the magnetic declination (also called magnetic variation), and varies around the world. The declination in your location can be found on maps or by searching online.

This setting can be set from -99° to +99°.

If you only need to match an uncompensated compass, or your navigation is all based on relative directions, then this setting is not necessary and can be left at 0°.

Operations Manual Perdix 69 Manual DocRev A Calibrate Compass Calibration of the compass may be needed if the accuracy drifts over time or if a permanent magnet or ferromagnetic metal (e.g. Enable On iron or nickel) object is mounted very close to the Perdix. To be Calibrate calibrated out, such an object must be mounted with the Perdix so Adjust True North that it moves along with the Perdix.

Next Calibrate BATTERY AFFECTS THE Compass Cal. COMPASS CALIBRATION Calibrate Each battery has its own magnetic signature, mostly due Factory Reset to its steel case. Therefore, recalibrating the compass when Exit changing the battery is recommended.

Next Calibrate Compare the Perdix with a known good compass or fixed references to determine if calibration is needed. If comparing against fixed references, remember to consider the local deviation between Magnetic North and True North (declination).

Calibration is typically not needed when travelling to different locations. The adjustment needed then is the True North (declination).

When calibrating, rotate the Perdix smoothly through as many 3D twists and turns as possible in 15 seconds. Keep metal and magnetic objects away during calibration. The calibration can also be reset back to the factory values. After calibration, it is recommended to compare the compass accuracy with a known good compass or fixed references

TIPS FOR A GOOD COMPASS CALIBRATION

Stay away from metal objects. For example, Rotate to as many 3D positions as wrist watches, metal desks, boat decks, possible. Upside down, sideways, on desktop computers, etc. can all interfere edge, etc. with the Earth's magnetic field. Compare with another compass (not a smartphone as those are terrible) to check your calibration.

Operations Manual Perdix 70 Manual DocRev A SYSTEM SETUP System Setup System Setup System Setup Date 8-Aug-2015 Date 8-Aug-2015 Date 8-Aug-2015 Time 08:08AM Time 12:28PM Time 12:28PM Unlock Unlock Unlock Load Upgrade Load Upgrade Load Upgrade Reset to Defaults Reset to Defaults Reset to Defaults Next Edit Next Edit Next Unlock

Date Time Unlock Code The first ‘System Setup’ The next ‘System Setup’ The next ‘System Setup’ changeable option is changeable option is changeable option is ‘Date,’ which allows ‘Time’, which allows the ‘Unlock’ which allows the the user to set the user to set the current user the VPM-B Unlock current date. time. The format can in a code in order to add be set to AM, PM or 24 a 2nd decompression hour time algorithm

System Setup System Setup Date 8-Aug-2015 Date 8-Aug-2015 Time 12:28PM Time 12:28PM 8567000000000000 Unlock Load Upgrade Load Upgrade Reset to Defaults Wait PC 2:58 Reset to Defaults Next Unlock Cancel Next Reset

Load Upgrade See the section Reset to Defaults Use this option to load ‘Firmware Upload and The final ‘System Setup’ firmware upgrades. Dive Log Download’ for option is ‘Reset to This starts a Bluetooth detailed instructions Defaults’. This will reset connection and then all user changed options waits for commands to factory settings and from a laptop or desktop clear the tissues on the computer. Perdix. ‘Reset to Defaults’ cannot be reversed.

Note: This will not delete dive logs, or reset dive log numbers.

Operations Manual Perdix 71 Manual DocRev A ADVANCED CONFIGURATION 1

Advanced configuration contains items that will be used Advanced Config infrequently and can be ignored by most users. They provide more detailed configurations. Enter Adv. Config Reset Adv. Config System Info The first screen allows you to enter the advanced configuration Battery Info area, or to set the advanced configurations settings to their default.

Title Colour Done Edit The title colors can be changed for added contrast or visual appeal. Adv. Config 1 Default is Cyan, with gray, white and blue also available. Title Color Blue Main Colour End Dive Delav 060s Main colours can also be changed for added contrast. Bat Icon Surf + Warn Default is white but can be changed to green. Gas Select Classic End Dive Delay Next Edit Sets the time in seconds to wait after surfacing before ending the current dive.

This value can be set from 20 seconds to 600 seconds (10 minutes). Default is 60s.

This value can be set to a longer time if you want brief surface intervals connected together into one dive. Some instructors use a longer end dive delay when teaching courses. Alternatively, a shorter time can be used to exit dive mode more quickly upon surfacing.

Battery Icon The behavior of the battery icon can be changed here. Options are:

Surf+Warn: The battery icon always displays when on the surface. During dive it displays only if there is a low battery warning.

Always: The battery icon always displays.

Warn Only: The battery icon only appears when there is a low battery warning (this is how the Predator operates).

Gas Select The style of Select Gas menu. Either Classic or New. Classic style shows one gas at a time in the large font. New style shows all gases at once, but in the small font.

Operations Manual Perdix 72 Manual DocRev A ADVANCED CONFIGURATION 1 ADVANCED CONFIGURATION 2

This section allows changing of PPO2 limits.

WARNING

Do not change these values unless you understand the effect.

All values are in absolute atmospheres [ata] of pressure Adv. Config 2 (1 ata = 1.013 Bar) OC Min. PPO2 0.19 OC Max. PPO2 1.65 OC Min. PPO2 OC Deco PPO2 1.61 PPO2 displays in flashing red when less than this value. CC Min. PPO2 0.40 (Default 0.19) CC Max. PPO2 1.60 Done Edit OC Max. PPO2 PPO2 displays in flashing red when greater than this value. (Default 1.65)

OC Deco. PPO2 The decompression predictions (TTS and NDL) will assume that the gas in use at a given depth is the gas with the highest PPO2 that is less than or equal to this value. Also, the suggested gas switches (when the current gas is displayed in yellow) are determined by this value. If you change this value, please understand its effect. For example, if lowered to 1.50, then oxygen (99/00) will not be assumed at 20ft/6m. (Default 1.61)

CC Min. PPO2 PPO2 displays in flashing red when less than this value. (Default 0.40)

CC Max. PPO2 PPO2 displays in flashing red when greater than this value. (Default 1.60)

Note: In both OC and CC mode, a “Low PPO2” or “High PPO2” alert is displayed when the limits are violated for more than 30 seconds.

Operations Manual Perdix 73 Manual DocRev A FIRMWARE UPLOAD Bluetooth communications are used for both Firmware Uploading Watch the video: and Dive Log Downloading. Update Firmware NOTE: Upgrading the firmware resets decompression tissue loading. Plan repetitive dives accordingly.

Ensure that you have the latest version of Shearwater Desktop. You can get it by clicking here

In Shearwater Desktop, go to Dive Computer Update Firmware

On your Perdix, navigate to System Setup System Setup Load Upgrade DEPTH TIME SURFACE System Setup System Setup Date Date Clock Clock Unlock Unlock Load Upgrade Load Upgrade Reset to Defaults Reset to Defaults System Setup

Shearwater Desktop will detect your Perdix and select the latest available firmware.

WARNING During the update process, the screen may flicker or go blank for a few seconds. Do not remove the battery during the upgrade process.

Operations Manual Perdix 74 Manual DocRev A Choose your language, then press “Yes, Update” to install the latest firmware.

After that, Shearwater Desktop will send the firmware update to your Perdix.

The Perdix screen will give percentile updates of receiving the firmware, and then the Personal Computer will read “Firmware successfully sent to the computer”.

After receiving the new firmware, the Perdix will reset and display a message stating either firmware update success or failure.

Changing Languages If you have chosen a language other than English, you will be asked to select the language you want to use when you start your Perdix the first time.

If you want to change the language, take out the battery briefly, and the next time you start your Perdix, you will be asked to select the language.

Operations Manual Perdix 75 Manual DocRev A DIVE LOG DOWNLOAD

Bluetooth communications are used for both Firmware Uploading and Dive Log Downloading.

In Shearwater Desktop, go to Dive Computer Download Dive Log

The Download Dive Log window should pop up.

On your Perdix, navigate to Dive Log Upload Log Upload DEPTH TIME SURFACE DEPTH TIME SURFACE 0 8hr15mn 0 8hr15mn GasPO2 GasPO2 .91 .91 Upload Log Initializing Dive Log Next Upload Cancel

Operations Manual Perdix 76 Manual DocRev A Now go back to Shearwater Desktop. Click start from the open “Download Dive Log” box. The PC will then connect to the Perdix.

Once connected it will download a list of available dive logs and you will see a screen like this.

You can unselect any dive logs you don’t want to download, or you can press “Download” to download all the dives on your Perdix. After that, Shearwater Desktop will transfer the dives to your computer.

The first time you download dives from your Perdix, you will be asked to give the Perdix a name. If you have multiple Shearwater dive computers, you will be able to easily tell which dive was downloaded from which dive computer.

Operations Manual Perdix 77 Manual DocRev A CHANGING THE BATTERY

NOTE: A large coin or washer is required for this section.

Remove the battery cap Insert the coin or washer into the battery cap slot. Unscrew by turning counter clockwise until the battery cap is free. Be sure to store the battery cap in a clean dry space.

Exchange the battery Remove the existing battery by tilting the Perdix computer. Insert the new battery positive contact first. A small diagram on the bottom of the Perdix shows the proper orientation.

Accepted battery types The Shearwater Perdix can accept a wide variety of AA sized batteries. The Perdix can accept any AA sized (or 14500 size) battery that outputs a voltage between 0.9V and 4.3V.

Reinstalling the battery cap It is very important that the battery cap O-rings are clear of dust or debris. Carefully inspect your O-ring for any debris or damage and gently clean. It is recommended that you lubricate your battery cap’s O-ring on a regular basis with an O-ring lubricant compatible with Buna-N (Nitrile) O-rings. Lubricating helps ensure that the O-ring seats properly and does not twist or bunch.

Insert the battery cap into the Perdix and compress the battery contact springs. While the springs are compressed rotate the battery cap clockwise to engage the threads. Be sure not to cross thread the battery cap’s threads. Tighten the battery cap until snug and the Perdix powers on. Do not over tighten the battery cap.

Operations Manual Perdix 78 Manual DocRev A BATTERY TYPES

After changing the battery, a screen will prompt for the battery type to be entered.

The Perdix attempts to guess what type of battery is being used. If the battery type is incorrect, it should be manually edited.

Having the battery type set correctly is important so that the Perdix can give low battery warnings at the proper voltage levels.

Supported battery types are:

1.5V Alkaline: The common AA battery type that can be purchased at most supermarkets and electronics stores around the world. Not rechargeable. Inexpensive and reliable, they provide 45 hours of operation. Recommended.

ALKALINE BATTERIES CAN LEAK!

Alkaline batteries are especially prone to leaking corrosive battery acid when completely discharged. Remove discharged batteries immediately, and do not store your Perdix for more than 2 months with an alkaline battery installed.

1.5V Photo Lithium: Fairly common, but more expensive than alkalines. They provide about 60 hours of operation. Common brand is the Energizer Ultimate Lithium. Not rechargeable. Good for use in very cold water. Recommended.

1.2V NiMH: Common rechargeable batteries used in digital cameras and photo flashes. Can have high self discharge. Provide about 30 hours of operation per charge. Can die quickly, so care should be taken to ensure sufficient charge prior to diving.

3.6V Saft: The Saft LS14500 lithium batteries provide very high energy density. However, their high cost makes other battery types a better choice for most users. Provide about 130 hours of operation. Can die quickly, so care should be taken to ensure sufficient charge prior to diving.

3.7V Li-Ion: Rechargeable14500 Li-Ion batteries provide about 35 hours of operation per charge. Can be ordered from the internet. Have more gradual voltage drop as discharged, so easier to determine remaining capacity than NiMH rechargeables. Good in cold water.

NOTE: Battery operating lifetimes are given with screen on medium brightness and at room temperature. Higher brightness and lower temperature can reduce life. Lower brightness can increase life.

Operations Manual Perdix 79 Manual DocRev A BEHAVIOR ON BATTERY CHANGE

Settings

All settings are retained permanently. No loss of settings occurs when changing the battery.

Clock

The clock (time and date) is saved to permanent memory every 16 seconds when the Perdix is on, and every 5 minutes when off. When the battery is removed, the clock stops running. Once the battery is replaced, the clock is restored to the last saved value (so it is best to remove the battery while the Perdix is on for lowest error).

Quick battery changes will not require any adjustment, but the time should be corrected if the battery is removed for more than a few minutes.

After replacing the battery a screen appears for quick adjustments to the time

The Perdix uses a highly accurate quartz crystal for time keeping. Expected drift is about 1 minute per month. If you notice higher drift, it is likely due to clock stoppage during battery changes, and is easily corrected at the time of a battery change (see image above).

Decompression tissue loading

The battery may be safely changed between repetitive dives.

Like the clock, the decompression tissue loading is saved every 16 seconds to permanent memory when on, and every 5 minutes when off.

When the battery is removed the tissues remain stored in the permanent memory and are restored once the battery is replaced, allowing for battery changes between repetitive dives. However, the Perdix does not know for how long the battery was removed, so no surface interval adjustment is applied for the time that the battery is removed.

Operations Manual Perdix 80 Manual DocRev A For quick battery changes, the un-powered time interval is not significant. However, if the battery is removed shortly after a dive and then remains out for a long period, then residual tissue loading will remain when the battery is replaced. If you have not been diving for more than 4 days, it is safe to reset the tissues to their default levels (System Setup->Reset to Defaults->Tissues Only). Otherwise, just leave the tissues as is and accept the slightly higher conservatism for the next dive.

After a battery change the restored tissues are shown (with shortcut to reset)

Resetting the deco tissues sets them to saturated with air at the current atmospheric pressure

If at time of battery replacement any tissue is below saturated with air at the current pressure, then that tissue is brought up to being saturated with air. This might happen after a decompression dive that used 100% O2, where the faster tissues are often completely depleted of inert gas loading. Bringing such tissues back up to saturated with air after a battery change is the most conservative approach.

When deco tissues are reset, the following are reset:

Inert gas tissue loadings set to saturated with air at current atmospheric pressure CNS Oxygen Toxicity set to 0% Surface Interval time set to 0 All VPM-B values set to default levels

Operations Manual Perdix 81 Manual DocRev A LIMITATIONS OF ALARMS All alarm systems share common weaknesses.

They can alarm when no error condition exists (false positive). Or they can fail to alarm when a real error condition occurs (false negative).

So by all means respond to these alarms if you see them, but NEVER depend on them. Your judgement, education, and experience are your best defenses. Have a plan for failures, build experience slowly, and dive within your experience.

Operations Manual Perdix 82 Manual DocRev A ERROR DISPLAYS

The system has several displays that alert to error conditions.

LIMITATIONS OF ALARMS

All alarm systems share common weaknesses. They can alarm when no error condition exists (false positive). Or they can fail to alarm when a real error condition occurs (false negative).

Each of the alarms will display the message in yellow until dismissed. The error is dismissed by pressing the SELECT (right) button.

DEPTH TIME STOP TIME

45 5GasPO2 For example. this message will appear if the average PPO2 goes above 1.65 for more than 30 seconds. Error 1.68 Confirm HIGH PPO2

Other errors you may encounter are shown in the table below.

Highest priority error is listed first. if multiple errors occur simultaneously, the error with the highest priority will be displayed. Clear that error by pressing the SELECT (right) button to see the next error.

Error Description Solution

The PPO2 is below the limit set on the Change your breathing gas to one Low PPO2 Adv. Config. page (default 0.19) safe for the current depth.

The PPO2 is above the limit set on the Change your breathing gas to one High PPO2 Adv. Config. page (default 1.65) safe for the current depth.

Descend to deeper than the currently displayed stop depth. Monitor A required decompression stop was Missed Stop for symptoms of DCS. Use extra violated. conservatism for future repetitive dives.

Operations Manual Perdix 83 Manual DocRev A Error Description Solution

Use a slow ascent rate. Monitor The ascent was sustained at faster than for symptoms of DCS. Use extra Fast ascent 10m/min (33 feet/min). conservatism for future repetitive dives.

The decompression tissue inert gas Tissues Cleared Plan repetitive dives accordingly. loading has been set to default levels.

Low Battery Int. The internal battery is low. Replace the battery.

Switch to a gas with a lower PPO2 Central Nervous System (CNS) toxicity High CNS or ascend shallower (decompression clock high exceeded 90%. ceiling allowing).

The computer has reset to recover from Please report to Shearwater Research Watchdog Reset an unexpected software condition. Inc.

Not really an error, just notification that Reset to Defaults N/A the reset has been completed.

Not really an error, just notification that New Unlock N/A a new unlock has been applied.

Firmware update failed, possibly due Try the firmware upgrade again. Upgrade Failed to a communications error or corrupted Contact Shearwater if problem file. persists.

Various other system Other messages than those above may Please report to Shearwater Research level errors be shown for system level failures. Inc.

The center row also shows permanent "Low PPO2" or "High PPO2" messages when the PPO2 is not in a safe range. These message will clear automatically once a safe PPO2 is restored.

DEPTH TIME STOP TIME DEPTH TIME STOP TIME 6 1 220 22 130 1 Low PPO2 High PPO2 1.2 1.2 O2/HE NDL TTS O2/HE NDL TTS OC 10/50 99 1 OC 15/40 0 56 Sample Errors on Center Row

Operations Manual Perdix 84 Manual DocRev A TROUBLESHOOTING

Symptom Troubleshooting

The Perdix uses a highly accurate quartz crystal for time keeping. Expected drift is about 1 minute per month. If you notice higher Time of day is not accurate drift, it is likely due to clock stoppage during battery changes. Adjust the time in the System menu.

Ensure the battery type setting is correct. The battery gauge will Battery life is short not function correct if the setting does not match the actual. This can be adjusted when the battery is changed.

Ensure the battery type setting is correct. The battery gauge will Battery dies without warning not function correct if the setting does not match the actual. This can be adjusted when the battery is changed.

Operations Manual Perdix 85 Manual DocRev A ERROR DISPLAYS The system has several displays that alert an error condition.

Each of the alarms will display the message in yellow until dismissed. The error is dismissed by pressing SELECT.

DEPTH TIME STOP TIME 45 GasPO2 PPO2 1.2 This message will appear if the average PPO2 goes Error Confirm above 1.6 for more than 30 seconds. HIGH PPO2

DEPTH TIME STOP TIME This message will appear if the average PPO2 goes 45 below 0.4 (.19 for OC or SC) for more than 30 seconds. GasPO2 It is not unusual to get this error immediately after 1.2 submerging with a manual CCR and a hypoxic mix. Error Confirm The first breath after submerging floods the loop with low PPO2 gas. The situation is usually resolved LOW PPO2 by increasing depth such that when the error is noticed, the PPO2 is no longer low.

DEPTH TIME STOP TIME This condition will also cause the “LOW PPO2” 45 display to appear. Here, the computer does not GasPO2 have two sensors that have confirming values. There is no way to know the actual PPO2, and the 1.2 average PPO2 will be calculated as 0.11 (the lowest Error Confirm value is the most conservative for decompression LOW PPO2 calculations).

DEPTH TIME STOP TIME 45 Battery GasPO2 This message will appear when your internal battery is low for 30 seconds. The battery needs to be 1.2 changed. The computer will also flash the battery Error Confirm symbol red. LOW BATTERY INT

Operations Manual Perdix 86 Manual DocRev A DEPTH TIME STOP TIME Ascent 45 This alarm is a notification that there has either been a GasPO2 very fast ascent for a short period of time, or that there 1.12 has been an ascent of more than 66 fpm / 20 mpm Error Confirm maintained for over a minute. This alarm may return FAST ASCENT after being dismissed if the condition occurs again.

DEPTH TIME STOP TIME Deco 45 50 2 The alarm occurs when the diver has been above the GasPO2 minimum depth for a decompression stop for more 1.12 than one minute. This alarm will only appear once Error Confirm during a dive, but it will also appear once on the MISSED DECO surface after the dive.

DEPTH TIME STOP TIME Tissues Cleared 45 This alarm will show when the decompression GasPO2 tissues are cleared. All decompression information 1.12 has been lost. Error Confirm TISSUES CLEARED

DEPTH TIME STOP TIME Watchdog Reset 45 This alarm happens when the computer does not GasPO2 complete all of its tasks in the time allotted. It can 1.2 happen occasionally from a transient problem like a Error Confirm battery bounce after an impact. It can also be the WATCHDOG RESET result of a hardware problem.

DEPTH TIME STOP TIME Upgrade Reset 45 This reset shows up after a software update. This is GasPO2 the normal event that shows the computer has been 1.2 rebooted after the software update. Error Confirm UPGRADE RESET

The center row also shows permanent "Low PPO2" or "High PPO2" messages when the PPO2 is not in a safe range. These message will clear automatically once a safe PPO2 is restored.

DEPTH TIME STOP TIME DEPTH TIME STOP TIME 6 1 220 22 130 1 CONTACT SHEARWATER Low PPO2 High PPO2 This is not an exhaustive list. Please contact us if you 1.2 1.2 experience any unexpected errors: O2/HE NDL TTS O2/HE NDL TTS OC 10/50 99 1 OC 15/40 0 56 [email protected] Sample errors on center row

Operations Manual Perdix 87 Manual DocRev A STORAGE AND MAINTENANCE The Perdix dive computer should be stored dry and clean, and Specification Perdix Model without batteries installed. Operating Modes OC Tec OC Rec OC/CC (internal PPO2) Do not allow salt deposits to build up on your dive computer. Gauge Wash your computer with fresh water to remove salt and other Decompression Model Bühlmann ZHL-16C with GF contaminants. Do not use detergents or other cleaning chemicals VPM-B and VPM-B/GFS (optional) as they may damage the Perdix dive computer. Allow to dry naturally before storing. Display Full color 2.2" QVGA LCD with always on LED backlight

Do not wash under high pressure jets of water as it may cause Pressure (depth) sensor Piezo-resistive damage to the depth sensor. Calibrated Range 0 Bar to 14 Bar Accuracy +/-20 mBar (at surface) Store the Perdix dive computer out of direct sunlight in a cool, dry +/-100 mBar (at 14bar) and dust free environment. Avoid continuous exposure to direct Crush Depth Limit 27 Bar (~260msw) ultra-violet radiation and radiant heat. Surface Pressure Range 500 mBar to 1040 mBar Depth of dive start 1.6 m of sea water Depth of dive end 0.9 m of sea water SERVICING Operating Temperature Range +4ºC to +32ºC Short-Term (hours) Temperature -10ºC to +50ºC There are no user serviceable parts inside the Perdix. Range Long-Term Storage Temperature +5ºC to +20ºC Do not tighten or remove the faceplate screws. Range Battery AA Size, 0.9V to 4.3V Clean with water ONLY. Any solvents may damage the User replaceable dive computer. Battery Operating Life 45 Hours (AA 1.5V Alkaline) (Display Medium Brightness) 130 Hours (SAFT LS14500) Service of the Perdix may only be done at Shearwater Research, Communications Bluetooth Smary Ready or by any of our authorized service centers. Compass Resolution 1° Compass Accuracy ±5° Your nearest service center can be found at Compass Tilt Compensation Yes, over ±45° pitch and roll www.shearwater.com/contact Dive Log Capacity Appoximately 1000 hours Battery cap o-ring Dual o-rings. Size: AS568-112 Material: Nitrile Durometer: 70A Wrist Attachment 2 x 3/4" Elastic Straps with Buckles, or 2 x Bungee Cord (3/16" diameter cord) Weight 152 g Size (W X L X H) 81mm X 71mm X 38mm

Operations Manual Perdix 88 Manual DocRev A SPECIFICATIONS

Specification Perdix Model Operating Modes OC Tec OC Rec OC/CC (internal PPO2) Gauge Decompression Model Bühlmann ZHL-16C with GF VPM-B and VPM-B/GFS (optional)

Display Full color 2.2" QVGA LCD with always on LED backlight

Pressure (depth) sensor Piezo-resistive Calibrated Range 0 Bar to 14 Bar Accuracy +/-20 mBar (at surface) +/-100 mBar (at 14bar) Crush Depth Limit 27 Bar (~260msw) Surface Pressure Range 500 mBar to 1040 mBar Depth of dive start 1.6 m of sea water Depth of dive end 0.9 m of sea water Operating Temperature Range +4ºC to +32ºC Short-Term (hours) Temperature -10ºC to +50ºC Range Long-Term Storage Temperature +5ºC to +20ºC Range Battery AA Size, 0.9V to 4.3V User replaceable Battery Operating Life 45 Hours (AA 1.5V Alkaline) (Display Medium Brightness) 130 Hours (SAFT LS14500) Communications Bluetooth Smary Ready Compass Resolution 1° Compass Accuracy ±5° Compass Tilt Compensation Yes, over ±45° pitch and roll Dive Log Capacity Appoximately 1000 hours Battery cap o-ring Dual o-rings. Size: AS568-112 Material: Nitrile Durometer: 70A Wrist Attachment 2 x 3/4" Elastic Straps with Buckles, or 2 x Bungee Cord (3/16" diameter cord) Weight 152 g Size (W X L X H) 81mm X 71mm X 38mm

Operations Manual Perdix 89 Manual DocRev A FCC WARNING a) USA-Federal Communications Commission (FCC) This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy. If not installed and used in accordance with the instructions, it may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.

If this equipment does cause harmful interference to radio or television reception, which can be determined by tuning the equipment off and on, the user is encouraged to try and correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna Increase the distance between the equipment and the receiver. Connect the equipment to outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help.

Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

Caution: Exposure to Radio Frequency Radiation. This device must not be co-located or operating in conjunction with any other antenna or transmitter. Contains TX FCC ID: T7VEBMU

INDUSTRY CANADA WARNING b) Canada - Industry Canada (IC) This device complies with RSS 210 of Industry Canada. Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of this device.

L‘utilisation de ce dispositif est autorisée seulement aux conditions suivantes : (1) il ne doit pas produire d’interference, et (2) l’utilisateur du dispositif doit étre prêt à accepter toute interference radioélectrique reçu, même si celle-ci est susceptible de compromettre le fonctionnement du dispositif.

Caution: Exposure to Radio Frequency Radiation. The installer of this radio equipment must ensure that the antenna is located or pointed such that it does not emit RF field in excess of Health Canada limits for the general population; consult Safety Code 6, obtainable from Health Canada’s website. Contains TX IC: 216QEbzzMU

Operations Manual Perdix 90 Manual DocRev A CONTACT

Shearwater Research Inc. Headquarters EU Service Center 13155 Delf Place, Unit 250 Narked at 90 Ltd Richmond, BC 109 Irthlingborough Rd V6V 2A2 Finedon, Northamptonshire Tel: +1.604.669.9958 NN9 5EJ, UK [email protected] Tel: +44.1933.681255 [email protected]

US Rep & Service Center Asia/Pac Rep & Service Center Curt McNamee Paul Trainor (Underwater Obsession) 1316 142nd PL SE 287 Happy Valley Road Mill Creek, WA Owhiro Bay, Wellington 98012, US 6023, NZ Tel: +1.425.418.1425 Tel: +64.27.6128265 [email protected] [email protected]

www.shearwater.com www.facebook.com/DiveShearwater

www.twitter.com/DiveShearwater www.youtube.com/shearwaterresearch

Operations Manual Perdix 91 Manual DocRev A OPERATING INSTRUCTION MANUAL