Thermocouple temperature sensor inserted rod damage causes and protection methods

Most of thermocouple temperature sensor are insertion, thermocouple temperature sensor inserted rod is in front of the sensor end, once damaged, seriously affecting the measuring accuracy of thermocouple temperature sensor. Thermocouple temperature sensor in use will inevitably occur the phenomenon of rupture, will directly affect the reliability of safe operation.

through the investigation on the phenomenon of thermocouple sensor inserted rod broken, find the reasons, found that the cause of thermocouple temperature sensor inserted rod fracture basically has the following several aspects:

temperature thermocouple sensor inserted rod is impacted by the high velocity, load too much negative, stress exceeds the limit, lead to insert rod burst;

insert the defects of the thermocouple temperature sensor, lead to stress concentration, easy to cause inserted rod fracture;

the pipe vibration is too large, thermocouple temperature sensor inserted rod fatigue damage;

when fluid flows through the temperature thermocouple sensor inserted rod, inserted rod vibration induced thermocouple temperature sensor, the temperature thermocouple sensor inserted rod vortex shedding frequencies and fluid resonance frequency. The resonance phenomenon will result in the destroy of thermocouple temperature sensor inserted rod speed, so that the fracture.

how to protect the thermocouple temperature sensor inserted rod is damaged?

mainly from the following strict control thermocouple sensor inserted rod insertion depth. With the increase of insertion depth, protect the stress of the inserted bar the increase of times square. So, when we measure the temperature just insert the thermocouple temperature sensor rod inserted into the fluid isothermal region, without having to plug into the center of the pipe, so conducive to shorten the length of cantilever thermometer bag, achieve the result that reduce the amplitude of the endpoint. In the necessary thermocouple sensor inserted rod strength cases, optimization choose the diameter of the thermocouple temperature sensor inserted rod. Because when the diameter of the thermocouple temperature sensor inserted rod increases, the fob stress increased linearly, so when selecting fob diameter, reasonable to ensure the strength of the inserting rod, and stagger the resonance of danger as soon as possible. Change of cross section shape, surface processing to turn it into a structural type, make the fluid does not produce whirlpool falls off phenomenon. Strictly control the quality of maintenance, completes the thermocouple sensor inserted rod material inspection, completes the inspection check, even at the same time keep a joint fracture, fracture and other abnormal accidents. When the system was put into operation, to avoid the line suddenly fully open valve. At the moment just put open valve, temperature thermocouple sensors inserted rod will suffer great ChanXiangLi, so just put into operation in the system, should slowly open valve, make the system pressure rise gradually, minimize temperature thermocouple sensors inserted rod of the front and back pressure difference, avoid inserted rod caused by excessive one-way bearing insert rod breaking accidents.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure thermocouple sensor, digital temperature thermocouple sensor