Insert stem damage reason and protection methods temperature sensor1

Most temperature sensor is inserted into the model, the temperature sensor inserted rod is in front of the sensor end, once the damage is serious influence the measuring accuracy of the temperature sensor. 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 sensor inserted rod broken, find the reasons, found the cause of temperature sensor inserted rod fracture basically has the following several aspects:

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

temperature sensor inserted rod itself defects, lead to stress concentration, easy to cause inserted rod fracture;

pipeline vibration, temperature sensor inserted rod fatigue damage;

when fluid flows through the temperature sensor inserted rod, inserted rod vibration induced by temperature sensor, the temperature sensor inserted rod vortex shedding frequencies and fluid resonance frequency. This resonance phenomenon can lead to temperature sensor insert stem damage faster, so that the fracture.

how to protect the temperature sensor inserted rod is damaged?

mainly from the following strict control 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 only will be inserted rod inserted into the fluid in the isothermal temperature sensor area, 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 case of the necessary sensor inserted rod strength, insert the diameter of the rod optimization selection of temperature sensor. Because when the temperature sensor into the diameter of the stem increases, the fob stress increase 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 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 sensor 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 sensor 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 sensor and digital temperature sensor