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Juergensen Marine Juergensen Marine Hammerhead CCR Instruction Manual Revision 3.0 Written by Joseph Radomski Kevin Juergensen Copyright ©2003, Juergensen Marine All Rights Reserved 2 Table of Contents Introduction...........................................................................................................................3 Setup and Installation.............................................................................................................3 Hardware Revisions................................................................................................................ 6 Battery Life ............................................................................................................................. 6 System Overview ................................................................................................................. 11 Threat Matrix ........................................................................................................................ 13 Primary Wrist Unit ............................................................................................................. 15 Handset Display Details........................................................................................................ 15 Set-Point Operation............................................................................................................... 16 Options and Programming .................................................................................................... 17 Gas Selection ................................................................................................................ 17 FO2 Display................................................................................................................... 17 Open Circuit / Closed Circuit Selection........................................................................ 17 Opt Menu ...................................................................................................................... 17 Define Gas ............................................................................................................ 18 Conservatism......................................................................................................... 18 Custom Gradient ................................................................................................... 21 Important Decompression Information......................................................... 21 Define Set-Point.................................................................................................... 22 Calibrate Oxygen .................................................................................................. 22 Set Sea Level......................................................................................................... 23 Backlight Timer .................................................................................................... 23 Imperial Metric ..................................................................................................... 23 Solenoid Firing...................................................................................................... 24 Auto Shutdown Timer........................................................................................... 24 MV Display........................................................................................................... 24 Standard Error....................................................................................................... 24 Diagnostics.................................................................................................................... 25 Test Watchdog ...................................................................................................... 25 Volts Display ........................................................................................................ 25 About............................................................................................................................. 25 Secondary Wrist Unit.......................................................................................................... 26 Oxygen Sensors................................................................................................................... 27 Maintenance........................................................................................................................ 29 Illustrations Primary Handset Flow Chart...............................................................................................9 Secondary Handset Flow Chart ........................................................................................ 10 Alarms Flow Chart .............................................................................................................. 14 3 INTRODUCTION The Hammerhead is a replacement set of electronics and scrubber head for the Inspiration Rebreather. The Wrist Units are available for homebuilders, and retrofitting into commercial rebreathers. The Hammerhead will be available as a complete package utilizing a custom head for the KISS rebreather, or a replacement pod for Biomarine rebreathers. The electronics will be offered as a factory installed option on the Megladon Rebreather. For the purposes of instruction, this manual will assume use with the Inspiration but the programming, calibration, and other functions apply to all versions. The most important point an Inspiration diver must realize is that once equipped with the Hammerhead electronics the rebreather is no longer an Inspiration. The Wrist Units are truly independent; all calibration and set-point changes must be performed on each Wrist Unit. The standard Inspiration has two Handsets that are called the Master and Slave; each handset is capable of operating as the master controller. The Hammerhead has two Wrist Units called the Primary and Secondary. Each Wrist Unit serves a particular purpose. The Primary Wrist Unit is responsible for maintaining the chosen set-point, displaying the measured PO2 for the three main Oxygen sensors, time, depth and decompression information. The Secondary Wrist Unit is a backup display for the main Oxygen sensors, and controller for the DIVA Heads-Up display. The Secondary DOES NOT CONTROL the solenoid; this Wrist Unit enables the diver to manually maintain the breathing loop in the event of a Primary failure. The only common point between the Primary and Secondary are the Oxygen sensors that are wired with additional isolation between the Wrist Units. Each Hammerhead Wrist Units contain an independent and isolated power source. SETUP and INSTALLATION The first task is removal of the sensor plate to allow installation of the Oxygen sensors – Teledyne R22d. Other Oxygen sensors designed specifically for rebreather use may be utilized providing the mV reading is above 8.5mV and below 13.5mV in Air and at least 40mv in 100% Oxygen. This plate is held in place by a hand-tightened retaining nut. For convenience the Oxygen sensor plate has the positions numbered on both sides. The last position is only used when an external PO2 monitor or integrated dive computer is connected. The proper cable is available for the HS-Explorer and VR3 computers. The sensors should be installed such that the face is visible with the plate numbering on the outer edge. The sensors will work in either orientation but this arrangement permits easy identification while the plate is installed. The sensor o-ring should be removed 4 prior to installation and should be labeled with the installation date and position for future reference. The sensors should be returned to their previous position. Tracking the health of the sensors is easiest by using the cell position as a reference. WARNING! The Wrist Units have no way to recognize a sensor has been moved to another location. This will result erroneous PO2 readings until Wrist Units are recalibrated. Prevent potential problems ALWAYS use the same location for each cell. The Hammerhead electronics aids in sensor health tracking by permitting the user to display actual millivolt readings for each Oxygen sensor. This is done by utilizing the “MV DISPLAY” function available on both the Primary and Secondary Wrist Units. As we have said above, maintaining a log of the millivolt readings for each cell when exposed to air and Oxygen will potentially reveal cells that are beginning to degrade and that are non-linear. The actual Oxygen percentage used in calibration should also be recorded so the correct mV output for the cells can be calculated. A detailed explanation on oxygen sensors is presented later in the manual. The replacement scrubber lid has five ports. The first port is used for the Oxygen solenoid. This is where the short Oxygen hose used on the Inspiration is connected. This connector was designed for easy removal allowing easy o-ring and solenoid inspection and replacement. The Oxygen hose should only be hand-tightened, NEVER USE ANY TOOLS. Continuing clockwise the next port is equipped with a 1/4 inch NPT blanking plug. This port is for an external dive computer such as the HS-Explorer and VR3. The proper cable can be purchased from Juergensen Marine or may be obtained from the computer manufacturer. The blanking plug has to be removed and the appropriate cable installed using Teflon tape, DO NOT OVERTIGHTEN. Some of the sensor capable computers have differing polarity requirements depending on the vintage. If no reading is obtained from the sensor, try reversing the
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