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Live zero is a key advantage of 4-20mA instrumentation signals.

Using Ohms Law (E=IxR), with I = 4mA and R = 250 ohms, we see that the minimum measurement would be 1Vdc.

If the range of the voltage trend recorder is 0-5V, any measured value below 1V indicates an electrical problem. A supply fuse failure or tripped breaker will be immediately reported.

Where is this important? Depending on the software capabilities, this can be processed as an alarm or recorded in the data for analysis later.

The ROI-XMA is an improved way to read sensors. Multiple sensor types. Multiple signal ranges. High linearity. High precision. Fast response. Long transmission distances. True analog signal conditioning, not microprocessor based A-D conversion.

Robert Owen Inc.
PO Box 227
Albertson, NY 11507
516-815-3199

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