Adjustment of the temperature measurement range for K-type thermocouples.
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For a K-type thermocouple with a temperature range of 0 to 500 degrees, what is the current when the temperature is set at 100 degrees? But the PV value shows around -27.
Is the thermocouple wired backwards? The preliminary judgment is that the wiring is incorrect.
This post was last edited by 659zhulinfeng on 2019-8-25 at 22:18. The current corresponding to 100 degrees should be 4 + 16 * (100 + room temperature; if the temperature at the temperature compensation point is around 20 degrees), / 500 = 7.8 mA. Often, the minimum current set by the transmitter is 3.8 mA. An alarm is triggered if the value is below this level. There could be several possible reasons for this; please consider the following: 1. Is there a problem with the thermocouple? If the temperature is 100 degrees, remove the compensation wire and measure the potential of the thermocouple. 2. Could there be an issue with the temperature sensor itself? 3. Is there a problem with the safety barrier? Try swapping it with other temperature safety gates. 4. Connect the compensation wire in reverse