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Why is the temperature inaccurate when the temperature controller is calibrated and rises from more than ten degrees to hundreds of degrees (voltage controls the temperature)

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it is normal for the temperature controller to conduct PID self-tuning. After the self-tuning, the thermostat will turn into normal operation.

the temperature controller generally has two differences, one is the error (generally positive or negative K1) and the other is the return tolerance (generally K2)
error is the difference of measurement. For example, the actual control value you set is 80 degrees (the ideal value you want to achieve), but considering the existence of error, the set value is: 1) for the upper limit that needs to be controlled, such as heater, it should be set as: (80 + K1); 2) For the lower limit of control, such as cooling fan, it should be set as: (80-k1)
the return tolerance is the degree to which the temperature needs to be changed after reaching the set value. The controller acts again. It does not mean that it acts immediately after exceeding your set value (such as 80 + K1), but there is a range, such as 7 and 8K. For the heater controlled by the upper limit, it acts after (80-k2) and for the cooling fan controlled by the lower limit, it acts after (80 + K2)

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