Transmitter no output
1 Transmitter no output, check the transmitter power is reversed;
The power polarity is connected correctly
2 measuring transmitter power supply, whether there is 24V DC voltage;
It must be ensured that the power supply voltage supplied to the transmitter is ≥12V (ie the voltage at the input of the transmitter power supply is ≥12V). If there is no power, you should check whether the circuit is broken, whether the instrument is selected wrong (input impedance should be ≤ 250Ω); and so on.
3 If it is integrated with the header, check the header is damaged (you can short the first two lines of the header, if the short-circuit is normal, then the header is damaged);
If the header is damaged, you need to change the header.
4 Connect the current meter into the 24V power supply circuit and check if the current is normal.
If it is normal, the transmitter is normal. At this time, check whether other instruments in the loop are normal.
Transmitter output accuracy is not satisfactory
, transmitter power is normal
If it is less than 12 VDC, check whether there is a large load in the loop. The input impedance of the transmitter load should meet RL ≤ (transmitter supply voltage -12V) / (0.02A) Ω
, whether integrated debugging
, thermal resistance (or thermocouple) and housing insulation meet the requirements
If insulation is not required, appropriate insulation treatment is required.