Digital Panel Meters FAQ

Topic: Process Monitor

Why does my process monitor's display reading stay fixed at "000" as the 4-20mA signal is varied?

The most common cause for a process monitor not responding to changes in the loop current occurrs when a single-ended transmitter is driving two single-ended input process monitors. The second process monitor's grounded negative (-) input effectively shunts the transmitter's output current around the first monitor, that is, no loop current passes through the DMS-30PC-4/20s-24RL's input circuit. The solution is to either power the second process monitor from an isolated dc power supply or use one of DATEL's "-I" isolated-power process monitors.
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