Piezoelectric Accelerometer Applications • Gas Turbine Engine Monitoring • Ground Test Application • APU Testing • Compressor or Gear Box Monitoring Features • Self-generated (no external power) • Balanced Differential Output • Operates to +500°F (+260°C) • Available in 10, 20 or 50 pC/g sensitivity Description The CEC Model 4-170 is a self-generating, piezoelectric accelerometer designed for medium temperature vibration measurement applications. This instrument provides a high sensitivity and stable output for continuous operation at temperatures as high as +500°F (+260°C). While the unit does not require power for operation, the accelerometer output must be operated into a charge converter that is designed to accept a 100,000 ohm source resistance. The 4-170 piezo ceramic sensing element is housed within a rugged case, where both the case and connector are made from Inconel 625. The mounting base incorporates a standard three-point mounting pattern on a 1.188” diameter B.C., common to many applications. The 4-170 series provides a balanced differential output that is isolated from the case ground. CEC Vibration Products • 746 Arrow Grand Circle • Covina, California 91722 • USA (626) 938-0200 • (800) 468-1345 • Fax: (626) 938-0202 www.cecvp.com ISO 9001:2000 AS9100 Certified Accelerometers 4-170

4-170 Piezoelectric Accelerometer Performance Specifications DYNAMIC Reference Sensitivity 4-170-0010: 10 pC/g RMS 5% referenced @ 100 Hz 4-170-0020: 20 pC/g RMS 5% referenced @ 100 Hz 4-170-0050: 50 pC/g RMS 5% referenced @ 100 Hz Frequency: 5 to 3000 Hz Frequency Response: 5 to 10 Hz, ±10% of reference 10 to 3000 Hz, ±5% of reference Transverse Sensitivity: < 5% Amplitude Linearity: 1% up to 100 g RMS ELECTRICAL Output: Balanced differential (2-pin floating) Transducer Capacitance: 1.14 nF Pin to Case Capacitance: 23 pF Transducer Resistance: 100k Ω minimum at +500°F (+260°C) Pin to Case Resistance:...