Regarding the insertion depth of the temperature element
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HG/T20507 states that \"when the temperature sensing element is installed vertically on a fully filled fluid pipeline or at an angle of 45° to the pipe wall, the length of the end of the temperature sensing element that is submerged within the inner wall of the pipeline should be no less than 50 mm and no more than 125 mm.\" Does this length refer to the length of the end perpendicular to the pipe wall, or to the distance from the end of the sensing element to the opening? According to the data sheet provided by another project design institute of the company, the insertion depth for just any temperature value exceeds 125 mm; as shown in the figure, it’s 300 mm. How can this be explained?
This is related to the process and installation. You can discuss it with the designer.
We usually insert it in the middle of the pipe
According to the **specifications: 1. For high-temperature and high-pressure steam pipes, the diameter shall not exceed 250 mm; the insertion depth is 70 mm. When the diameter is greater than 250 mm, the insertion depth is 100 mm； 2. For general fluid medium pipeline projects, when the diameter is not greater than 500 mm, the insertion depth is 1/2 of the pipe diameter; when it is greater than 500 mm, the insertion depth is 300 mm
Further question: Are there any standards for the specifications of ordinary armored thermocouples?
There are standards, and these standards are easy to find. Here is a link to a database; this is one of them: http://wenku.baidu.com/link?url=1u0mq5KLqbE1EaheAvq5jji7RyBFbYE04a7hXoLzbAI00vgw1vgKln06nPUb8M8ZeW-BSJEhnw_0Vd8UT48Tw3DP7koIcGbU0i2fSifMe8a
Yes, GBT 18404-2001: Armored thermocouple cables and armored thermocouples
Insertion depth refers to the distance from the sensor probe to the process connection, something like that.