Pressure thermometers are made using the principle that the working medium (gas, vapour or liquid) in a sealed container changes in pressure as the temperature changes. In the use, installation to pay attention to the following issues.
Filled with gas or liquid pressure type thermometer instrument readings not only with the temperature of the temperature packet, and by the capillary tube and spring tube temperature, that is, the impact of the surrounding environment temperature, although the use of certain compensation methods, but also can not make the impact of the ambient temperature to be completely compensated. Therefore a range of ambient temperature variations during use is specified. This should be borne in mind in actual use. The static pressure of the liquid then acts on the manometer, producing a reading error that should be corrected.
