Question 3028 of 223 · California Water Treatment Operator Exam
In a 4 to 20 mA instrument signal, 4 mA normally represents
Exactly one answer is correct.
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Correct answer to question 3028
- B: the bottom of the measuring range (zero)
Explanation
4 mA is the live zero. A reading of 0 mA indicates a wiring or instrument failure rather than a zero measurement.
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