Endevco® Model 7240C Miniature Piezoelectric Accelerometer
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Catalog excerpts

Endevco® Model 7240C Miniature Piezoelectric Accelerometer - 1

Model 7240C Piezoelectric accelerometer Features • Light weight (4.8 gm) • Hermetically sealed • High frequency measurement • High temperature operation (+260°C) • Wide bandwidth (flat to 30 kHz) The Endevco® model 7240C is a miniature, light-weight piezoelectric accelerometer designed specifically for high frequency vibration measurement. Its unique sensor design allows high seismic resonance and ruggedness in the same package. The unit is hermetically sealed against environmental contamination and its light weight (4.8 gm) effectively eliminates mass loading. The accelerometer is a self-generating device that requires no external power source for operation. The model 7240C features Endevco’s Piezite® type P-8 crystal element, operating in annular-shear mode. This device exhibits low base-strain sensitivity, wide bandwidth, and excellent output stability over time. Signal ground is connected to the outer case of the unit. When used with one of the supplied isolated mounting studs, the accelerometer is electrically isolated from ground. A specially designed low-noise coaxial cable is supplied for error-free operation. Endevco signal conditioner models 133, 2775B, 2771C, 6634C or Oasis 2000 (4990A-X with cards 428 and/or 433) computer-controlled system are recommended for use with this high-impedance accelerometer. TYPICAL AMPLITUDE RESPONSE, MODEL 7240C WITH ISOLATOR FREQUENCY IN HERTZ TYPICAL TEMPERATURE RESPONSE, MODEL 7240C TYPICAL CAPACITANCE CHARGE SENSITIVITY

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Endevco® Model 7240C Miniature Piezoelectric Accelerometer - 2

Model 7240C Piezoelectric accelerometer Specifications The following performance specifications conform to ISA-RP-37.2 (1964) and are typical values, referenced at +75˚F (+24˚C) and 100 Hz, unless otherwise noted. Calibration data, traceable to National Institute of Standards and Technology (NIST), is supplied. Dynamic characteristics Charge sensitivity (typical) pC/g 3.0 Minimum pC/g 2.3 Frequency response See typical amplitude response Resonance frequency (typical) kHz 90 Minimum kHz 80 Amplitude response [1] ±1 dB Hz 1 to 20 000 ± 5% Hz 1 to 10 000 Temperature response (from -67°F(-55°C)...

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