When there is a fault in the temperature instrument, before judging the fault, we should first pay attention to a problem, that is, whether the temperature instrument used in the system uses electrical instruments to measure, indicate and control the temperature. If the answer is yes, it means that there is a certain lag in the measurement of the system instrument.
Temperature instrument system generally does not have limit indication value, so once the maximum or minimum temperature value occurs, it can be generally judged as temperature instrument system fault. The temperature instrument system seldom changes suddenly, which is caused by the lag of the system itself, so the sudden temperature changes are mainly thermocouple, thermal resistance, compensation wire broken or transmitter power amplifier failure.
If the temperature value of the thermometer vibrates too fast in use, most of the control parameters PID are not adjusted properly. If the temperature instrument fluctuates slowly, the main reason is the process operation. If the process operation reason is eliminated, the temperature instrument fails.
The common feature of the temperature instrument system itself is that the control signal has not been changed. According to the control signal, the fault can be judged, which is constant. The input signal of the diaphragm valve of the control valve diaphragm head leaks, the signal fault of the valve positioner itself does not change, and the output signal fault of the system controller is the regulator itself.
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