Pressure thermometer
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What medium is generally filled in the capillary of a pressure thermometer, and is it greatly affected by the ambient temperature? What are the common brands, domestic and foreign?
There are also this type of thermometer; it’s useful to know about it
There is one from Weika, called an air-bulb thermometer; this type is generally used in locations where installation conditions are quite demanding. It also has a wide temperature measurement range, allowing it to function at low temperatures down to -200°C. The interior is filled with an inert gas, and it operates on the principle of thermal expansion. The ambient temperature does have an impact, and high precision isn’t required of such local instruments
Thermometers with on-site readings are less costly than those using thermal resistance or thermocouples for temperature measurement, and they allow readings to be taken at a distance from the installation point compared to bimetallic thermometers.