Wear-resistant thermocouple is a kind of thermocouple classification of special materials. It is a wear-resistant protective tube made of plasma spraying technology, high-chromium cast iron and high-temperature alloy materials. It can be customized for different temperature environments and can be applied. In the use of circulating fluidized bed, fluidized bed furnace, cement rotary kiln tail gas chamber, there are more failures in the use of wear-resistant thermocouples, and some details need to be paid attention to. The troubleshooting mainly includes the following points for attention:. 1. The insulation layer of the compensation wire of the wear-resistant thermocouple is worn out, forming a signal loop to ground. This is mainly because the compensation wire is hard and has not been placed flat in the junction box. When dealing with the problem, the junction box cover is repeatedly screwed to touch the compensation wire and it will be worn out. This type of fault is reflected in the temperature indication on the operator's control station, which is generally too small. 2. The compensation wire of the wear-resistant thermocouple is connected reversely. This is primarily a problem that arises during infrastructure construction. The temporary formation of the wiring personnel is a human factor. When the compensation wire of the thermocouple is connected reversely, the display on the operator's control station is generally larger or smaller than the actual value (depending on the channel measurement loop). 3. The connection terminals in the junction box are in poor contact. Because the wires of the compensation wire and the thermocouple are relatively hard, it is difficult to fasten the wires during on-site maintenance. Sometimes the wires are tightened at the beginning, but after a while the wires are deformed and loosened again. Such faults are reflected in the temperature indication on the operator's control station as no indication or the indication value exceeds the range. 4. Compensation for resistance faults. This kind of fault is manifested as the temperature display value slowly rises or falls after the thermocouple is connected. 5. The fault rate of measuring thermocouple in the tail flue of the boiler is relatively high. The thermocouple was removed during the shutdown and maintenance. It was found that the head of the thermocouple, including the protective tube, was severely worn by the smoke. The protective tube was made of wear-resistant steel material to eliminate such hidden dangers. 6. The temperature input signal is faulty after passing through the isolator, and the temperature value signal reflected on the operator's control station is abnormal. It is normal after replacing the isolator. The above are the problems that are often encountered during maintenance, but when looking for these problems, it is recommended to use a multimeter to measure the input voltage value on the I/O terminal cabinet of the DCS, so that it can quickly determine whether the problem is the local measurement end or the DCS part. For the problem of multi-point input, it can also be compared with the signals of several other thermocouples. If the resistance value cannot be determined, the resistance value of the wear-resistant thermocouple is generally measured at about 100Ω. 7. Poor grounding in the DCS cabinet of the signal shielding system. This kind of fault is very easy to form a charge accumulation on the signal line, causing signal drift or shaking. Because this problem is difficult to find out, the general approach is to untie the signal line and discharge it to ground.
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