MODEL 144 ACCELEROMETER CONDITIONER features

• 3 output modes
  
• Displacement output at discrete frequency
  
• 3 1/2 digit DPM readout
  
• Relay trip protection

Description

The Model 144 is a compact vibration monitoring system, with two single-channel modules mounted in an 8" x 12" x 6" carrying case. Constant current excitation is provided for an accelerometer charge converter, whose signal is tightly filtered and monitored for exceeding a front-panel-set level. If the level is exceeded, relay contacts complete an external alarm circuit. A 4-20mA output also transmits the vibration level to other continuous monitoring equipment.

Specifications

Input signal: Voltage output from accelerometer's charge converter

Excitation: 4mADC constant current to charge converter; 24VDC compliance

Input sensitivity: Typically 50mV/g

Gain: Front panel switch selects pre-filter gains of 0.1, 1, or 10, with locking 10-turn scale adjustment pot for overall range of 0.1 to 200

Bandpass filter: Sharply tuned twin-tee filter at 120Hz (factory adjustable from 40Hz to 5kHz)

AC output: Acceleration signal, gained and 120Hz filtered (0-7VRMS max)

DC output: Jumper-selectable RMS/DC output (0-7VDC) or 4-20mA version of RMS/DC voltage

Display: 3 1/2 digit LED meter indicates RMS/DC output

Alarm level: Settable by front panel trimpot from 0.1-10VRMS

Alarm output: Front panel LED and one nonlatching form C (SPDT) relay contact operates on alarm condition

Power: Unregulated ±24V and +10V from rack-mounted supply

Carrying case: 2 module desktop case, Model 4017-107

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