MODEL 144 ACCELEROMETER CONDITIONER
Description
The Model 144 is a compact vibration monitoring system consisting of two single-channel modules mounted in a 6”H x 8”W x 12”D portable 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 monitoring equipment. The Model 144 features three output modes: displacement output at discrete frequency, 3 1/2 digit readout of RMS-DC output, and relay trip protection.
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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: | Two-module desktop case, Model 4017-107 |