Piezoresistive Pressure Transducer ENDEVCO MODEL 8534A Model 8534A -10, -20, -50 and -100 • • • • 10 to 100 psia 300 mV Full Scale Rugged, Subminiature 0.065 Inch Diameter DESCRIPTION The ENDEVCO® Model 8534A is a rugged, subminiature piezoresistive pressure transducer for measuring absolute pressure. It has a case diameter of only 0.065 inch (1.65 mm) and is available in ranges from 10 to 100 psia full scale. Full scale output is 300 mV with high overload capability and high frequency response. Actual size .050 (1.27) DIA. X 27/33 (686/838) 4 CONDUCTOR CABLE ENDEVCO pressure transducers feature an active fourarm strain gage bridge diffused into a sculptured silicon diaphragm for maximum sensitivity and wideband frequency response. Self-contained hybrid temperature compensation provides stable performance over the wide temperature range of 0°F to +200°F (-18°C to +93°C). ENDEVCO transducers also feature excellent linearity (even to 3X range), high shock resistance, and high stability during temperature transients. .450 (11.43) TINNED LEADS .063/.067 DIA. (1.60/1.70) SILVER PLATED SHIELD PRESSURE VESSEL BONDED IN PLACE WITH RTV CASE The Model 8534A can be installed in locations which are difficult to reach. Its small size permits flush mounting on curved surfaces. Its high sensitivity combined with small size and high resonance makes the 8534A suitable for use on small-scale models in wind tunnels. RED + IN NO RTV .10 MIN. (2.5) NOMINAL .30 (7.6) GRN + OUT .071/.075 DIA. (1.80/1.90) BLK - IN ENDEVCO Model 136 Three-Channel System, Model 4430A Signal Conditioner, or Model 68207 BCAS™ Computer Controlled Systems are recommended as signal conditioner and power supply. MOUNTING DETAIL WHT - OUT STANDARD TOLERANCE INCHES (MILLIMETERS) .XX = +/- .03 (.X = +/- .8) .XXX = +/- .010 (.XX = +/- .25) SPECIFICATIONS CERTIFIED PERFORMANCE: All specifications assume +75°F (+24°C) and 10 Vdc excitation unless otherwise stated. The following parameters are 100% tested. Calibration data, traceable to the National Institute of Standards and Technology (NIST), is supplied. RANGE [1] SENSITIVITY [1] COMBINED: NON-LINEARITY, NON REPEATABILITY, PRESSURE HYSTERESIS [2] Non-Linearity, Independent Non-Repeatability Pressure Hysteresis ZERO MEASURAND OUTPUT [3] ZERO SHIFT AFTER 3X RANGE THERMAL ZERO SHIFT From 0°F to +200°F (-18°C to +93°C) THERMAL SENSITIVITY SHIFT From 0°F to +200°F (-18°C to +93°C) UNITS psia mV/psia 8534A-10 0 -10 30 ±10 -20 0 - 20 15 ±5 -50 0 - 50 6 ±2 -100 0 - 100 3 ±1 % FSO RSS Max % FSO Typ % FSO Typ % FSO Typ mV Max ±% 3X FSO Max (Typ) 1.0 0.5 0.1 0.1 ±10 0.2 (0.02) 0.50 0.2 0.1 0.1 ±10 0.2 (0.02) 0.50 0.2 0.1 0.1 ±10 0.2 (0.02) 0.50 0.2 0.1 0.1 ±10 0.2 (0.02) ±% FSO Max 3 3 3 3 ±% Max 4 4 4 4 ENDEVCO Piezoresistive Pressure Transducer MODEL 8534A SPECIFICATIONS—continued TYPICAL PERFORMANCE CHARACTERISTICS: The following parameters are established from testing of sample units. RESONANCE FREQUENCY NON-LINEARITY AT 3X RANGE THERMAL TRANSIENT RESPONSE PER ISA-S37.10, PARA. 6.7, PROCEDURE l [4] PHOTOFLASH RESPONSE [5] WARM-UP TIME [6] ACCELERATION SENSITIVITY Longitudinal Lateral BURST PRESSURE (Diaphragm) ELECTRICAL FULL SCALE OUTPUT SUPPLY VOLTAGE [5] ELECTRICAL CONFIGURATION POLARITY RESISTANCE Input Output Isolation NOISE MECHANICAL CASE MATERIAL CABLE, INTEGRAL DEAD VOLUME MOUNTING WEIGHT (excluding lead wires) ENVIRONMENTAL MEDIA TEMPERATURE [7] VIBRATION ACCELERATION SHOCK HUMIDITY Units Hz % 3X FSO psi/°F psi/°C Equiv. psi ms 8534A-10 140 000 1.0 0.001 0.002 0.1 1 -20 200 000 1.0 0.003 0.005 0.5 1 -50 370 000 1.0 0.005 0.009 1.0 1 -100 410 000 0.5 0.01 0.02 1.0 1 Equiv. psi/g Equiv. psi/g psi Min 0.00015 0.00006 100 0.0002 0.00005 150 0.0003 0.0002 200 0.0006 0.0004 400 300 ±100 mV at 10.0 Vdc 10.0 Vdc recommended, 18 Vdc maximum Active four-arm piezoresistive bridge Positive output for increasing pressure 2000 ±800 ohms 1600 ±500 ohms 100 megohms minimum at 50 Volts; leads to case, leads to shield, shield to case 5 microvolts rms typical, dc to 50 000 Hz; 50 microvolts rms maximum, dc to 50 000 Hz Nickel -Iron Alloy Four conductor No. 36 AWG Teflon® insulated leads, braided shield, Teflon jacket 30 ±3 inches, (760 ±76 mm) 0.000015 cubic inches (0.0002 cc) Bond into #49 drill hole (1.85 mm) using RTV, such as DOW CORNING Silastic® 738; RTV is not permitted within 0.10 inch (2.5 mm) of unit's face 0.08 gram (cable weighs 3.6 grams/meter) Internal seals are epoxy and are compatible with clean dry gas media. Media is exposed to nickel-iron alloy. Parylene C, and epoxy. For use in water or corrosive media, contact the factory for modifications and installation precautions which may be taken to extend service life. -65°F to +250°F (-54°C to +121°C) 1000 g pk 1000 g 20 000 g, 100 microsecond haversine pulse Isolation resistance greater than 100 megohms at 50 volts, per MIL-STD-202E, Method 103B, Test Condition B CALIBRATION DATA Data supplied for all parameters in Certified Performance section. Optional calibrations available for all parameters in Typical Performance section. OPTIONAL ACCESSORY 25034 4 CONDUCTOR SHIELDED CABLE NOTES 1. 1 psi = 6.895 kPa = 0.069 bar. 2. FSO (Full Scale Output) is defined as transducer output change from 0 psia to + full scale pressure. 3. Zero Measurand Output (ZMO) is the transducer output with 0 psia applied. 4. Use of excitation voltages other than 10.0 Vdc requires manufacture and calibration at that since thermal errors increase with high excitation voltages. 5. Per ISA-S37.10, Para 6.7, Procedure II. 6. Warm-up time is defined as elapsed time from excitation voltage "turn on" until the transducer output is within ±1% of reading accuracy. 7. Units can be compensated over any 200°F (93°C) span from -65°F to +250°F (-54°C to +121°C) NOTE: Tighter specifications are available on special order. Continued product improvement necessitates that Endevco reserve the right to modify these specifications without notice. Endevco maintains a program of constant surveillance over all products to ensure a high level of reliability. This program includes attention to reliability factors during product design, the support of stringent Quality Control requirements, and compulsory corrective action procedures. These measures, together with conservative specifications have made the name Endevco synonymous with reliability. ENDEVCO CORPORATION, 30700 RANCHO VIEJO ROAD, SAN JUAN CAPISTRANO, CA 92675 USA (949) 493-8181 fax (949) 661-7231 0298