① The transmitter has no output. Check if the power supply of the transmitter is reversed;

Connect the power polarity correctly

② Measure the power supply of the transmitter to see if there is a 24V DC voltage;

It is necessary to ensure that the power supply voltage to the transmitter is ≥ 12V (i.e. the input voltage of the transmitter power supply is ≥ 12V). If there is no power supply, check whether the circuit is disconnected and whether the detection instrument is selected incorrectly (input impedance should be ≤ 250 Ω); and so on.

③ If it is an integrated device with a header, check if the header is damaged (you can first short circuit the two wires of the header, if they are normal after the short circuit, it means that the header is damaged);

If the header is damaged, it needs to be replaced with a new header,

④ Connect the ammeter in series to the 24V power circuit and check if the current is normal;

If it is normal, it means that the transmitter is normal. At this time, check whether other instruments in the circuit are normal.

1. Is the transmitter power supply normal

If it is less than 12VDC, check if there is a large load in the circuit, and the input impedance of the transmitter load should comply with RL ≤ (transmitter supply voltage -12V)/(0.02A) Ω

2. Has integrated debugging been conducted

Perform integrated debugging

3. Does the insulation between the thermistor (or thermocouple) and the casing meet the requirements

If the insulation does not meet the requirements, corresponding insulation treatment is required.