What is the purpose of a loop calibrator in a 4 to 20 mA loop?
A. To measure current in the loop
B. To display the process variable
C. To provide electrical isolation
D. To generate a current signal for calibration
Answer:D
What is the purpose of a loop calibrator in a 4 to 20 mA loop?
A. To measure current in the loop B. To display the process variable C. To provide electrical isolation D. To generate a current signal for calibration
Explanation: A loop calibrator is a device used to generate a current signal for calibration purposes in a 4 to 20 mA loop. It typically consists of a potentiometer or other device that can be used to adjust the output current of the calibrator.