How to determine if the working status of a 4-20mA output transmitter is incorrect?

The transmitter is installed on-site and is often not removable, or there is no calibration device on-site to make a judgment. At this time, use a multimeter to connect in series with the transmitter and signal line, setting the range to mA. Close the valve; if the output is around 4.00mA, it is considered normal. If the output is less than 3.00mA or greater than 20.00mA, it should be judged as a fault in the sensor probe part. An output greater than 5mA and less than 20mA indicates a circuit fault, while no current also indicates a fault in the circuit board. After identifying the cause of the problem, replace the spare parts and restart the equipment to observe if it operates normally.

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How to determine if the working status of a 4-20mA output transmitter is incorrect?

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