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1. Fault instance 1
The temperature indication value of an industrial furnace after replacing the thermocouple is obviously lower than the actual value.
(1) On-site fault treatment
Thermocouple body is normal. After checking the maintenance record and the equipment manual, it was found that the original thermocouple was 1.3m. Although the metal body of the replaced thermocouple was the same, its length was 600mm. The replaced thermocouple was of the same model, and the fault was eliminated.
(2) Fault cause analysis
The length of the thermocouple in the furnace is not enough to measure the temperature effectively.
2. Fault instance 2
After the resistance furnace instrument is checked, the thermocouple is installed in situ, but the temperature measurement is too low, especially the temperature deviation is more obvious in the heating stage.
(1) On-site fault treatment
Rock wool insulation treatment for thermocouple installation hole, troubleshooting.
(2) Fault cause analysis
After the thermocouple is reinstalled, the installation hole has no insulation measures, which causes local air convection and affects the temperature measurement effect.
3. Fault instance 3
Newly installed electric furnace, temperature indicator fluctuates greatly.
(1) On-site fault treatment
Field observation shows that the fluctuation of temperature meter pointer is consistent with the change of heating current of electric furnace. Make sure the field compensation wire is bundled with the main power line for laying. Lay the compensation wire and instrument connection wire separately and isolate them from the main power line for troubleshooting.
(2) Fault cause analysis
The temperature measurement signal line is subject to electromagnetic interference
4. Key points of fault disclosure
Point 10: The length of the thermocouple should meet the requirements and go deep into the measured temperature area.
Point 11: Thermocouple installation hole should not be too large, after loading into the thermocouple to do insulation measures.
Point 12: The thermocouple and instrument signal lines should not be placed in the same pipe or close to the high-voltage power line to avoid electromagnetic interference.
5. conclusion
The equipment can not work normally and the quality of products is often affected by the improper configuration and operation mode of thermocouple. In the use and maintenance of a thermocouple, the installation and operation shall be carried out in a standardized manner. The standardization of thermocouple configuration and operation mode is an important subject in industrial production operation, which requires practitioners to constantly improve in combination with relevant professional knowledge in practice, so as to avoid equipment and production accidents.
On 2018-08-08 11:45:46
