Fault resolution temperature control instrumentation system

Common faults in temperature control instrumentation systems

Temperature control instruments, all the machinery, equipment, kiln, container, liquid, gas, solid and other temperatures that need to be detected or controlled can be installed. It is an ideal experimental and production equipment for scientific research units, universities, industrial and mining enterprises. However, when used, the temperature control instrument system may have faults and errors due to various interference factors. Then the next small series will introduce you to the common faults of temperature control instruments:

(1) The indicator value of the temperature meter system suddenly changes to the maximum or minimum, which is generally the fault of the instrument system. Because the temperature meter system measures a large lag, no sudden changes will occur. The cause of the fault at this time is mostly caused by thermocouple, thermal resistance, compensation wire breakage or transmitter amplifier failure.

(2) The temperature control instrument system indicates that there is a rapid oscillation phenomenon, which is mostly caused by improper adjustment of the control parameter PID.

(3) The temperature control instrument system indicates that there is a large and slow fluctuation, which is probably caused by a change in process operation. If the process operation does not change at that time, it is likely to be a malfunction of the instrument control system itself.

(4) Failure analysis step of the temperature control system itself: check whether the input signal of the regulating valve changes, the input signal does not change, the regulating valve acts, the diaphragm of the regulating valve head is leaked; check whether the input signal of the regulating valve positioner changes, the input signal No change, the output signal changes, the positioner is faulty; check the positioner input signal changes, and then check whether the regulator output changes, if the regulator input does not change, the output changes, this is the regulator itself failure.

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