What causes the standard 4 to 20 mA signal to jump between 0 and full scale?
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As the title suggests, I’m seeking advice from experts; thanks in advance. Specifically, it’s a CO optical analyzer: all its components are working properly, but there is no reading at the local display, and the remote transmission value changes suddenly
There might be interference or something of that kind; it’s possible to check for loose connections, as those can also cause significant fluctuations
For resistance signals, loose wiring that causes intermittent connections leads to sudden changes in the value between 0 and the full scale, which is easy to understand. Does the same thing happen with current signals?
Additionally, the casing of the analyzer has a positive voltage of around 15 volts with respect to the 0V wire; in other words, the voltage of the 48V positive wire relative to ground is only a little over 30 volts. I’m not sure what’s causing this.