How to measure the temperature of low-temperature gases (helium or nitrogen) inside 1/4 stainless steel tubes
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Experts, how can we measure the temperature of low-temperature gases (helium or nitrogen) inside 1/4-inch stainless steel tubes at temperatures around -100°C? The tubes can be cut open
Choose the appropriate thermometer; it is best to insert the probe into the pipe at the elbow, as this provides the most accurate readings. The next option is the surface-mounted type, in which the thermometer is placed closely against the pipe, with insulation applied on the outside
If it can be cut open, a thermometer should be installed; the position of the thermometer requires a change in diameter, and there are standard diagrams available – refer to the \"Specifications for the Installation of Thermal Instruments\".
The specifications clearly state that when installing temperature measurement devices on pipes with a diameter of less than 80 mm, an expansion tube must be used, and the temperature measurement device should be installed on this expansion tube.