Instrument Mechanician Trade Test Practice Questions - South Africa Artisan Trade Test - Instrument Mechanician Exam

Why does the standard current loop use 4 mA rather than 0 mA to represent 0% of the measured range?

To save power in the transmitter To provide a live zero that allows broken-loop detection Because 4 mA is easier to calibrate To match the supply voltage

Correct Answer:

To provide a live zero that allows broken-loop detection

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