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KING-GAGE® Acrasensor™ Effective: August 2009 Supplement 1100-25 KING-GAGE ® Liquid Level Transmitter AcraSensor™ ■ Flush mounting sanitary design ■ Electronic (4-20 mA) output or pneumatic output ■ Field replaceable sensor diaphragm ■ Consistent output during CIP cycles Reliable Liquid Level Measurement Sanitary Configurations These unique pneumatic sensors detect level by sensing These sensors are especially suited to a wide range hydrostatic pressure created by liquid depth. Acting of sanitary applications on storage or continuous on the force balance principle, a sensitive diaphragm processing vessels. The unique AcraSensor titanium is exposed to the liquid contents of the tank. Com- diaphragm satisfies the 3-A Sanitary Standard pressed air within the sensor creates a pneumatic and is appropriate for flush mount, clean-in-place pressure that balances the force of the liquid acting installation. An FDA-approved silicone rubber O-ring against the diaphragm. This compensating pneumatic seal forms a crevice-free, positive compression seal pressure is directly proportional to the depth of liquid between the diaphragm probe and mounting shell. in the tank. Flush weld mountings are available with product contact surfaces of 316L stainless. The pneumatic force balance technique is virtually free from long term drift, hysteresis and temperature The level sensor can be alternatively supplied with sensitivity unlike strain measurements (including load silicone rubber or Buna-N diaphragm surfaces. cells) since mechanical deflection of the diaphragm is These molded elastomers provide additional material not directly measured. The compensating pneumatic compatibility options. (Quick disconnect sanitary balance pressure which effectively isolates the sensor adapters are also available for sensor mounting.) is converted to a proportional 4-20 mAdc signal or can be directly output to a suitable gauge. In Conformance to Sanitary Standard actuality, the sensor is measuring the mass (weight) ® The AcraSensor diaphragm is authorized to carry the of fluid matter that can be correlated to units of 3-A symbol and conforms to 3-A Sanitary Standards standardized volume. 74-03, Sensors and Sensor Fittings and Connections. Page 1 AcraSensor - Liquid Level Sensor Supplement 1100-25 Tank Gauging Applications Transmitter Signal Loop Acting on the force balance principle, a pneumatic As is typical of two wire transmitters, electrical power sensor generates air pressure equivalent to the hydro- to the signal loop is supplied through twisted pair static force created by liquid depth. This pneumatic cable. Excitation voltage (+V) is provided by the re- pressure is directed into the D/P transmitter. Pressure ceiving device or from a separate Vdc power supply is converted to an electronic 4-20 mAdc output pro- installed in the loop. The actual voltage necessary for portional to liquid depth. Twisted pair cabling is used operation of the system will depend upon the overall to form the signal loop through which the remote load resistance of the loop. In most applications, the indicator receives the transmitter output. The KING- KING-GAGE Digital Indicator or LevelBAR indicator GAGE indicators shown in these system views correlate provide 24 Vdc excitation to power the transmitter the transmitter output to total volume or weight of signal loop. tank contents. This is determined by using a pressure versus capacity listing corresponding to the actual 4 to 20 mA tank dimensions. +VA The standard AcraSensor + 868 D/P Sensor Control TP1 – – + - 1 combination combines accuracy, rugged durability, METER 2 3 4 reduced maintenance and long term stability for liquid com V + TP2 level tank gauging. Its integral transmitter converts the RL + pneumatic isolation pressure to a proportional 4-20 mAdc signal suitable for process control or remote Internal connections level indication. at D/P Sensor Control AcraSensor + 868 D/P Sensor Control 4-20 mA Output The standard AcraSensor + 868 D/P Sensor Control combination combines accuracy, rugged durability, reduced maintenance and long term stability. Designed for liquid level tank gauging, it gen- erates a proportional 4-20 mAdc signal suitable for process control or remote level indication. Pneumatic force balance diaphragm sensor paired with regulator/transmitter provides two wire out- 868 D/P put compatible with tank level indicators or PLCs AcraSensor Sensor (with analog I/O modules). 3-tube bundled cable diaphragm unit Control is supplied to complete the pneumatic connections. LevelBAR KING ENGINEERING ® KING-GAGE Liquid Level Gauging Syst ™ CORPS. , ANN ARB ® OR, MICHIGA em TANK 1 N U. S. 100 A. 10000 KING-GAGE ® KING ENGINE ERING COR ® POR ATION 90 9000 80 8000 9982 70 TANK1 7 GAL 7000 8 9 1.019 60 4 Menu 5 6 6000 KING-GAGE 1 Select 50 2 Reset 3 Edit 5000 0 . 40 Enter 4000 LP2 Indicator 30 3000 20 4-20 mA signal via 2000 10 868 D/P Sensor 1000 EACH MARK = 1 PERCENT FULL 1.00 SP. GR. SP. MARK = 1 PERCENT FULL 1.00 EACH unshielded twisted 2 LVB-3 200 GR. 1.00 SP. GALS. MARK = 100 EACH 115 Vac Control Power pair cable KING-GAGE LevelBAR E Indicator V P Compressed Air Supply AcraSensor System Package with 868 D/P Sensor Control (4-20 mA Output) Page 2 AcraSensor - Liquid Level Sensor Supplement 1100-25 Pneumatic Operation Application Notes AcraSensor diaphragm unit is paired with a Sensor Location of the Sensor Control air flow regulator Control regulator to provide the continuous 1 CFH should be generally no greater than 50 feet (15 m) (cubic foot per hour) air flow to the underside of the from the AcraSensor unit. The level sensor includes 15 diaphragm to attain pneumatic balance pressure. feet (4.5 m) of bundled 3-tube cable for the pneumatic Constant back pressure regulation maintains a linear interconnections with the Sensor Control. Distances 1:1 response throughout the entire operating range greater than 50 feet may increase response time of the to ensure pneumatic pressure is directly equivalent to sensor to changes in liquid level in the tank. the hydrostatic head of liquid in the tank. Compressed Air Supply The AcraSensor + 860 Sensor Control combination Operation of the AcraSensor requires a compressed affords rugged durability and simple maintenance. air/gas source providing supply pressure of 35-150 Used in conjunction with compatible indicators (such psig (2.4-10.3 bar). Pneumatic components require as the KING-GAGE LevelBAR), this liquid level sen- instrumentation-grade compressed air that is clean, sor can provide reliable operation in even the most dry and oil-free to ensure trouble free performance. challenging environments. Alternative configurations include substitution of a molded silicone rubber or Buna-N diaphragm when appropriate. AcraSensor + 860 D/P Sensor Control Pneumatic Only The AcraSensor + 860 Sensor Control combination offers rug- ged durability and simplified maintenance. The pneumatic output pressure can be directed into compatible indicators (such as KING- GAGE LevelBAR) or a remote transducer up to several hundred feet away from the tank. Pneumatic force balance diaphragm sensor paired with a specialized regulator assembly. 3-tube bun- 860 dled cable is supplied to complete the pneumatic AcraSensor Sensor connections. (No electrical components are included diaphragm unit Control with this package.) Pneumatic Signal via ¼˝ tubing G V P LevelBAR Compressed KING ENGIN ® KING-GAGE Liquid EERIN Level Gau G CORPS., A ™ NN ARBging Syste Air Supply ® OR, MICHIG m TANK 1 AN U.S.A. 100 10000 90 9000 80 8000 70 7000 60 6000 50 5000 860 Sensor 40 4000 30 3000 Control 20 2000 10 1000 EACH MARK = 1 PERCENT FULL 1.00 SP. GR. FULL 1.00 SP. MARK = 1 PERCENT EACH 2 LVB-3 200 GR. SP. 1.00 = 100 GALS. MARK EACH Power KING-GAGE Indicator AcraSensor System Package with 860 Sensor Control (Pneumatic Output ) Page 3 KING-GAGE® - AcraSensor Liquid Level Sensor Specifications Span Adjustment Range Transmitter turndown ratio is 3:1 for the 0–15, Sensitivity 0–30, 0–50 psid nominal ranges. Less than .001 psi (± .02" water / .508 mm water) Nominal Minimum Range of Adjustment Repeatability 0–5 psid 0–3 psid 0–83 in. thru 0–138 in. water / Better than ± .002 psi (± .05" water / 1.27 mm water) 0–2.1 m thru 0–3.5 m water 0–10 psid 0–3 psid 0–83 in. thru 0–277 in. water / Accuracy 0–2.1 m thru 0–7.0 m water ± .007 psi (± .02" water / .508 mm water) 0–15 psid 0–3 psid 0–83 in. thru 0–415 in. water / Temperature Range 0–2.1 m thru 0–10.5 m water 30° F to 300° F (0° C to 149° C) 0–30 psid 0–10 psid 0–277 in. thru 0–830 in. water / 0–7.0 m thru 0–21.0 m water Pressure Range Sensor is a 1:1 pneumatic force balance diaphragm 0–50 psid 0–15 psid 0–415 in. thru 0–1384 in. water / capable of repeating hydrostatic pressure as an equivalent 0–10.5 m thru 0–35.1 m water pneumatic output. Functional pressure limit is 130 psi IMPORTANT! Accuracy, linearity, and non-repeatability (or 3598 inches @ 1.00 specific gravity) determined by values are based on nominal range. supply pressure (35-150 psi) less 20 psi. Operating Limit (Maximum Pressure) Maximum Depth Measurement 1937 in. water (49.0 m water) Pressure above 300% nominal range (overrange) will result in damage to the transmitter (200% may Wetted Materials cause a shift in calibration). Burst pressure is 200 psi Silicone rubber O-ring (certified to 3-A 18-02) Titanium and will cause catastrophic and physical failure of the diaphragm, commercially pure (certified to 3-A 74-03). pressure element. Optional diaphragm materials: Silicone rubber, Buna-N Fittings/adapter wetted surfaces are typically 316L Installation stainless steel (as supplied by King Engineering). For sanitary flush mount installation, shell is installed through the side of the tank and flush-welded to in- Air Consumption ner liner.
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