Operation and Maintenance of Wear resistant Thermocouples

Due to the use of different high-strength wear-resistant protective tubes and surface modification measures for different temperature ranges and measured media, wear-resistant thermocouples form a composite tube type solid structure. This series of products is suitable for temperature measurement of flowing powders and materials such as petrochemicals, coal transportation systems, fluidized bed boilers, cement clinker, and refractory materials with severe wear of protective tubes. Further improve the service life of thermocouples. Its performance is superior to current wear-resistant thermocouples and has won high praise from users. Having multiple high-tech products at a high level, its special wear-resistant materials effectively solve the service life of temperature measurement thermocouples in circulating fluidized bed boilers without affecting temperature hysteresis. The protective sleeve has many technologies such as wear resistance, high temperature oxidation resistance, sulfur resistance, liquid iron powder, limestone corrosion resistance, erosion resistance, and vibration resistance, making the service life of temperature measurement thermocouples generally one to two years.
Possible causes and solutions for fault phenomena
The thermoelectric potential is smaller than the actual value (the displayed instrument indicates a lower value)
Identify the cause of the short circuit in the thermoelectric electrode. If it is caused by moisture, it needs to be dried; If it is caused by damaged insulators, the insulators need to be replaced
Dust accumulates at the terminal of the thermocouple, causing short circuit cleaning and dust accumulation
Compensate for short circuits between wires, identify the short circuit point, strengthen insulation or replace the compensating wire
Thermocouple hot electrode deterioration
If the length allows, cut off the deteriorated section and re weld it, or replace the thermocouple compensation wire with a new one and reconnect it correctly by reversing the polarity of the thermocouple
Compensation wire and thermocouple are not compatible
Replace the matching compensating wire. If the installation position of the thermocouple is not recorded or the insertion depth does not meet the requirements, reinstall the thermocouple according to the regulations. If the cold end temperature compensation does not meet the requirements, adjust the cold end compensator
The thermocouple and display instrument are not compatible. If the thermocouple or display instrument is paired, the thermoelectric potential is greater than the actual value (the displayed instrument indicates a higher value)
The thermocouple is not compatible with the display instrument. If the thermocouple or display instrument is not compatible, the compensation wire should be replaced to match the thermocouple. There is a DC interference signal entering to eliminate the unstable output of the thermoelectric potential caused by DC interference
Poor contact between thermocouple terminal and thermoelectric electrode
Tighten the terminal screws of the thermocouple to measure insulation damage in the circuit, causing intermittent short circuits or grounding. Identify the fault point and repair the insulation