Meggitt Sensing Systems Endevco® Model 2221D Piezoelectric Accelerometer
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Meggitt Sensing Systems Endevco® Model 2221D Piezoelectric Accelerometer - 1

Model 2221D Piezoelectric accelerometer Features • NEW! 2221D-R available as replacement sensor • High output, 17 pC/g • Light weight (12 gm) • 360° cable orientation • Low profile • Vibration measurement on small structures The Endevco® model 2221D is a piezoelectric accelerometer designed specifically for vibration measurement on small structures and objects. The unit is epoxy sealed and it is ideal for use in a controlled environment. Its light weight (12 gm) effectively minimizes mass loading. The accelerometer is a self-generating device that requires no external power source for operation. The model 2221D features Endevco’s Piezite® type P-8 crystal element operating in annular shear mode. This device exhibits excellent output sensitivity stability over time. Signal ground is connected to the outer case of the unit. When used with an isolated mounting screw, the accelerometer is electrically isolated from ground. A low-noise coaxial cable is supplied for errorfree operation. The transducer has a centrally located thru bolt, allowing for 360° cable orientation. The unit may also be adhesive mounted if the application permits. Endevco signal conditioner models 133, 2771C, 2775B, or Oasis 2000 computer-controlled system are recommended for use with this high impedance accelerometer.

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Meggitt Sensing Systems Endevco® Model 2221D Piezoelectric Accelerometer - 2

Model 2221D 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 17.0 Minimum pC/g 13.5 Frequency response See typical amplitude response Resonance frequency (typical) kHz 32 Amplitude response (1) ±5% Hz 1 to 6000 ±1 dB (ref) Hz 0.1 to 10 000 Temperature response See typical curve -67˚F...

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Meggitt Sensing Systems Endevco® Model 2221D Piezoelectric Accelerometer - 3

Model 2221D Piezoelectric accelerometer Accessories: Product Allen wrench 7/64 inch Cementing stud Mounting screw assembly Insulated adapter stud 10-32 In-line charge converter Signal conditioner Signal conditioner OASIS 2000 computer-controled system Notes: 1. Low-end response of the transducer is a function of its associated electronics. 2. Short duration shock pulses, such as those generated by metal-to-metal impact, may excite transducer resonance and cause linearity errors. Read TP290 for more details. 3. Maintain high levels of precision and accuracy using Meggitt’s factory...

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