Model 2228C Piezoelectric accelerometer Features • NEW! 2228C-R available as replacement sensor • Triaxial • Ground isolated • Light weight (15 gm) • Requires no external power • Vibration measurement in three orthogonal axis The Endevco® model 2228C is a small triaxial piezoelectric accelerometer designed specifically for vibration measurement in three orthogonal axes on small structures and objects. The transducer features three 10-32 receptacles for output connection and can be screw or adhesively mounted. Its light weight (15 gm) effectively minimizes mass loading. The accelerometer is a self-generating device that requires no external power source for operation. The model 2228C features Endevco’s Piezite® type P-8 crystal elements operating in annular shear mode. This unit exhibits excellent output sensitivity stability over time. Signal ground is isolated from the mounting surface of the unit. Low-noise, flexible coaxial cables are supplied for error-free operation. Endevco signal conditioner models 133, 2771C, 2775B, 6634C or OASIS 2000 computer-controlled system 4990A-X are recommended for use with this high impedance accelerometer. TYPICAL TEMPERATURE RESPONSE MATES WITH ENDEVCO 3000 SERIES CABLES WITH 10-32 UNF-2B CONNECTOR CHARGE SENSITIVITY MOUNTING SURFACE MUST BE FLAT WITHIN .001. STANDARD TOLERANCE INCHES (MILLIMETERS) .XX = +/- .02 (.X = +/- .5) .XXX = +/- .010 (.XX = +/- .25) UNIT IDENTIFICATION TYPICAL AMPLITUDE RESPONSE TYPICAL CAPACITANCE

Model 2228C Piezoelectric accelerometer Specifications The following performance specifications conform to ISA-RP-37.2 (1964) and are typical values, referenced at +75˚F (+24˚C), 4 mA 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 2.8 Minimum pC/g 2.2 Frequency response See typical amplitude response Resonance frequency kHz 21 Amplitude response [1] ±5% Hz 1 to 4000 ±1 dB (ref) Hz 0.1 to 6000 Temperature response See typical curve at -67°F (-55°C) max/min...