According to the wiring diagram of the meter, the correct wiring is connected. After the power is turned on, the meter first displays the thermocouple index number of the meter, and then displays the range of the meter. The digital tube of the lower row of the meter is then used to display the set temperature. The upper row of the meter displays the measured temperature.
If the digital display of the upper row of the meter is not the temperature of the heating element, and the status of “overâ€, “0000â€, or “000†is displayed, indicating that the input part of the instrument is malfunctioning, the following test should be performed:
a) Remove the thermocouple from the input of the instrument thermocouple and short-circuit the thermocouple input using any wire. When the power is on, the digital display on the upper row of the instrument is about room temperature, indicating that the thermocouple's internal connection is open, and the same type of thermocouple should be replaced. If it is still the above-mentioned condition, it means that the meter's input terminal is damaged during the transportation process, and the meter must be replaced.
b) Remove the thermocouple of the above-mentioned fault meter and replace it with a thermocouple connected to the meter with the same kind of index number running next to it. After the power is turned on, the upper-line digital tube of the original fault meter shows the temperature of the heating element, indicating the thermocouple. Open the internal connection, replace the same type of thermocouple. If it is still the above-mentioned situation, it means that the meter's input terminal is damaged during the transportation process, and the meter should be replaced.
c) Remove the faulty thermocouple from the meter, use a multimeter to measure ohms (r)*1, and measure the two ends of the thermocouple with a multimeter. If the multimeter shows a large resistance, Thermocouple internal connection open circuit, replace the same type of thermocouple. Otherwise there is a certain resistance, indicating that there is a problem with the input of the instrument, and the instrument should be replaced.
d) According to the wiring diagram of the meter, the wiring is correct. If the meter is powered on, the digital tube on the meter shows a negative value, indicating that the thermocouple “+†and “―†connected to the meter are connected incorrectly. Just change it again.
e) Correct wiring When the instrument is running, the temperature displayed on the digital tube on the upper line of the instrument is different from the actual measured temperature by 30c~60c. The difference is even greater, indicating that the meter's index number is wrong with the thermocouple's index number. According to the thermocouple index b, s, k, e and other thermocouple temperature (oc) and millivolt (mv) value of the relationship between the same temperature (oc), the resulting millivolt value (mv )b The smallest division number, the smallest s division number, the larger k division number, and the largest e division number, are distinguished by this principle.
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