1. After heating for a period of time, it is found that the temperature has not changed, and the temperature has been displayed at the time of the ambient temperature.
In this case, you need to check whether the SV value setting value is set, whether the OUT value indicator of the meter is not lit, and whether the No. 3 and No. 4 segments of the universal meter have 12VDC output. If the light is on, and the No. 3 and No. 4 terminals also have 12VDC output, the problem is that the control part of the heating element is to check whether there is an open circuit during the control, the device specification is not correct (for example, the 220V circuit is connected to the 380V device), whether the line connection is wrong, etc. At the same time, it is also necessary to see if there is a short circuit problem with the sensor, when the thermocouple is short-circuited, the temperature control instrument will always display the room temperature!
2. After heating, the temperature is getting lower and lower
In this case, the positive and negative poles of the sensor are generally reversed, and you need to check the input terminal wiring of the instrument sensor, thermocouple: 8 to the positive pole, 9 to the negative pole; PT100 thermal resistance: 8 to monochrome wire, 9 to negative electrode; PT100 RTD: 8 to monochrome wires, 9 and 10 to two wires of the same color
3. After heating for a period of time, the temperature displayed by the thermostat is quite different from the actual temperature of the heating element, such as about 100 degrees
For example, the temperature control meter is a K-type thermocouple input, but the J-type thermocouple is actually installed to measure the temperature.
4. The PV window of the meter displays HHH or LLL characters.
In this case, there is a problem with the signal measured by the instrument, the meter measurement temperature Du Yu -19 °C is to display LLL, and HHH is displayed when it is higher than 849 °C. If the temperature sensor is a thermocouple, you can remove the sensor, directly use the wire to short the thermocouple input terminals (8 and 9 terminals) of the instrument, after powering on, if the meter can display the room temperature normally (on-site ambient temperature such as: 30 °C), then the problem lies in the temperature sensor, use a multimeter tool to detect whether the temperature sensor (measuring thermocouple or PT100 thermal resistance) has an open circuit (disconnection), whether the sensor wire is reversed, wrong, or the specifications of the sensor are inconsistent with the instrument.
If all of the above problems are ruled out, the internal temperature measurement circuit of the meter may be burned due to leakage of the sensor.
5. The control is out of control, the temperature exceeds the set value, and the temperature has been rising.
In case of such a fault, first check whether the OUT indicator of the meter is lit at this time, and whether the No. 3 and No. 4 terminals of the DC voltage level measuring instrument with the "multimeter" have 12VDC output. If the lights are not on, there is no 12VDC output at terminals 3 and 4. This indicates that the problem is with the control device of the heating element (e.g.; AC contactors, solid state relays, relays, etc.). It is necessary to check whether the control device has a short circuit, the contact cannot be opened, and the wrong line is connected in real time.
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