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Table 19-3. Typical Failure Rates for Sensing Elements (Reference 57) SENSOR/TRANSDUCER TYPICAL FAILURE RATE A>TD,B (failures/106 hours) Accelerometer 174.2 Hall effect switch 0.6 Pneumatic switch 23.3 Solid state device 13.2 Thermocouple 0.01 Torque sensing device 80.0 Fluid flow sensor 133.8 Air flow sensor 32.9 Pressure sensor 39.1 Fluid level sensor 77.8 Humidity sensor 20.4 19.4 REFERENCES 19. Hindhede, U., et al, Machine Design Fundamentals, John Wiley & Sons, NY, 1983. 28. MIL-HDBK-217, "Reliability Prediction of Electronic Equipment" 57. Deutschman, A.D., et al, Machine Design; Theory and Practice, MacMillan Publishing Co, NY, 1975 Sensors and Transducers 19-6 Revision _

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