Most temperature sensors are insertion type, and the insertion rod in front of the temperature sensor is its induction end. Once damaged, the measurement accuracy of the temperature sensor will be seriously affected.It is inevitable that the temperature sensor will break in use, which will directly affect the reliable and safe operation.

By investigating the rupture of the sensor insert rod and finding the cause, it is found that the main reasons for the rupture of the temperature sensor insert rod are as follows:

1: The insertion rod of the temperature sensor is impacted by the high-speed fluid, so the load is too large and the stress exceeds the limit, resulting in the fracture of the insertion rod;

2: The processing defect of the temperature sensor insert rod itself leads to stress concentration, which is easy to cause the insert rod to break;

3. Excessive vibration of the pipeline causes fatigue damage to the insertion rod of the temperature sensor;When the fluid flows through the temperature sensor insert rod, the vibration of the temperature sensor insert rod is induced, that is, the natural frequency of the temperature sensor insert rod and the fluid vortex shedding frequency produce resonance.This resonance phenomenon causes the temperature sensor insert rod to damage faster and break.

How to protect the temperature sensor insert rod from damage?The insertion depth of the sensor insertion lever is strictly controlled from the following points.As the insertion depth increases, the force on the protective insertion rod increases by a factor of two.

1: When measuring temperature, only the temperature sensor insertion rod needs to be inserted into the isothermal region of the fluid instead of the center point of the pipeline, which is conducive to shortening the length of the cantilever of the thermometer bag and reducing the amplitude at its end.

2. Optimize the diameter of the temperature sensor insert rod under the condition of ensuring the necessary strength of the sensor insert rod.Because when the diameter of the inserted rod of the temperature sensor increases, the force on the table bag increases linearly, so when selecting the diameter of the table bag, it is necessary to reasonably ensure the strength of the inserted rod, but also to stagger the resonance danger zone as far as possible.

3: Change the shape of the cross section, and process the surface into the structure so that the fluid will not produce vortex shedding phenomenon.Strictly control the maintenance quality, do a good job in the sensor insert rod material inspection, but also do a good job in the flaw detection inspection, strictly prevent welding crack, fracture and other abnormal accidents.

4. When the system is put into operation, avoid the sudden full opening of the valve on the pipeline.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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