Problems with the installation of temperature sensing elements
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Requirements for installing temperature sensing elements in fluid pipelines: (l) When measuring the temperature of a pipeline, the temperature sensing element should be inserted in the direction of flow of the medium being measured, and it must be at least orthogonal (at 90 degrees) to that medium. ), avoid creating a co-current flow with the medium being measured, and ensure full contact between the temperature sensing element and the fluid in order to reduce measurement errors ； Why is there a larger error when installing in the same flow direction as the medium being measured?
It is to ensure that the thermometer makes full contact with the medium, thereby enabling a faster temperature response. To give an example: when you want to feel the wind, with your face facing the wind or with your face turned away from it, you can clearly sense the wind in one direction more than the other.
It’s probably because the contact isn’t complete
I think the error should depend on the inherent properties of the temperature element, but the thermal response is a major issue; it may take 3-5 times longer to reach an even temperature. If the temperature of the fluid in the pipeline fluctuates, this co-current installation will be a complete failure.