Analog Signal Protection
Measuring circuits are mostly built as analog signal circuits. These are constructed as two-wire current loops or as voltage signals without a common reference potential. A current loop has a measurement setup from 0 (4) to 20 mA.
Another analog signal is provided by the temperature measurements with PT100 measuring resistors. Here the voltage drop in the three-wire or four-wire combination is measured at the measuring resistor. It is important that all wires are included in the protection plan.
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