Advantages of Current (4-20mA) Signal compared to Voltage of Process Transmitter

In this video discussed the advantages of Current signal transmission compared to voltage transmission of a process transmitter i.e. measuring any process variable. Advantages of current signal:
1) Resistance addition have a greater voltage drop but does not affect the current signal as long as voltage compliance is available in the circuit.
2) Voltage signals attenuate slightly over long distance because of wire resistance. This is especially problematic if the signal level is low (e.g. mV outputs from load cells). Unlike voltage signals, 4 to 20 mA current signals do not attenuate over a long distance (within limits).
3) Current signals are inherently more immune to EMI than voltage signals, especially over longer distances. This is one of the big advantages of using current instead of voltage to get process measurements to a control system.
4) A broken wire on a current loop results in a 0 mA current flow. A controller can easily detect this unusually low current level as a cable error. If voltage signals are used, broken wiring can act like an antenna, allowing local EMI to induce a voltage onto the signal wires. This makes it more difficult to detect a cable break if the controller is measuring voltage.

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