Question 3021 of 229 · California Water Distribution Operator Exam
A SCADA tank level transmitter outputs 4 to 20 mA. What does 4 mA normally represent?
Exactly one answer is correct.
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Correct answer to question 3021
- B: The bottom of the instrument's range, such as an empty tank
Explanation
4 mA is zero on the scale and 20 mA is full scale, which lets a broken wire (0 mA) be spotted as a fault. This live-zero design is standard.
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