In order to resist the pressure and corrosion of the measurement medium during the measurement and use of the temperature transmitter, the temperature transmitter will choose to use a protective sleeve, which is sleeved outside the probe of the temperature transmitter and pre-installed on the equipment with pressure or inconvenient disassembly. The protective sleeve made of stainless steel is widely used in petroleum, chemical, environmental protection, industrial automation and other industrial fields, and plays a good role in protecting the temperature transmitter.
The protective tube of the temperature transmitter installed in the pipe is subjected to the flow impact of the medium liquid or gas and the biphasic flow, which exerts pressure on the casing. In this case, factors that affect the protective sleeve of the temperature transmitter are the insertion depth, the diameter of the sleeve, the medium flow rate and the pressure. Therefore, the following problems need to be paid attention to during the use of the protective sleeve of the temperature transmitter.
First of all, control the insertion depth of the protective sleeve of the temperature transmitter. As the depth of insertion increases, the force on the protective sleeve of the temperature transmitter increases by a square multiplier. Therefore, it is sufficient to insert the depth into the constant temperature area of the medium to be measured, and there is no need to insert it into the bottom of the pipe.
Secondly, the diameter and wall thickness of the casing are optimized under the condition of ensuring the strength of the protective sleeve of the temperature transmitter. As the casing diameter and wall thickness increase, the pressure also increases linearly.
Third, in strict accordance with the production testing standards, regularly inspect the equipment to prevent accidents.
Fourth, when the whole system starts and stops running, it is necessary to avoid the situation of instantaneous full opening. It is necessary to slowly open or close the valve to gradually increase the pressure, and reduce the pressure difference between the front and back of the temperature transmitter protective sleeve as much as possible, so as to avoid the occurrence of casing fracture accidents caused by excessive unidirectional force on the temperature transmitter casing.
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