1. Heating for a period of time, the temperature does not change. The ambient temperature of the site (e.g. room temperature 25°C) is displayed at all times.
In case of such a fault, first check whether the SV value setting value is set, whether the 0UT indicator light of the meter is lit, and whether the No. 3 and No. 4 terminals of the meter are 12VDC output with the "multimeter". If the light is on, terminals 3 and 4 also have a 12VDC output. This indicates that the problem is with the control device of the heating element (e.g.; AC contactors, solid-state relays, relays, etc.), check whether the control device has an open circuit, whether the device specification is wrong (such as a 380V device connected to a 220 circuit), and whether the circuit is connected to the wrong one. Also, check the sensor for a short circuit (the meter always shows room temperature when the thermocouple is shorted).
2. After heating for a period of time, the temperature display is getting lower and lower.
In case of such faults, the positive and negative polarity of the sensor is generally reversed, and the input terminal wiring of the instrument sensor should be checked (thermocouple: 8 to the positive pole, 9 to the negative pole: PT100 thermal resistance: 8 to the monochrome wire, 9 and 10 to the two wires of the same color).
3. After heating for a period of time, the temperature value (PV value) measured by the instrument is very different from the actual temperature of the heating element (for example, the actual temperature of the heating element is 200°C, while the meter shows 230°C or 180°C).
In case of this type of fault, first check whether there is any loose contact between the contact point between the deep temperature head and the heating element, whether the temperature measurement point is selected correctly, and whether the specification selection of the temperature sensor is consistent with the input specification of the temperature controller (for example, the temperature control meter is a K-type thermocouple input, and the J-type thermocouple is installed on site to measure the temperature).
4. The PV window of the temperature control instrument displays HHH or LLL characters.
If this type of fault is encountered, it means that the signal measured by the meter is abnormal (LL is displayed when the measurement temperature of the meter is lower than -19°C, and HHH is displayed when the measurement temperature is higher than 849C). Solution: 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 instrument 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 (thermocouple or PT100 thermal resistance) has an open circuit (broken wire), 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 0UT indicator light of the meter is lit at this time, and whether the No. 3 and No. 4 terminals of the meter with the DC voltage level of 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.).
Solution: 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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