What are the problems should be paid attention to in the pressure type thermometer use?

Pressure type thermometer is the use of the working medium of sealed container ( Gas, vapour or liquid) As the change of temperature, pressure change principle. In the use, installation, attention should be paid to the following questions: 1) Gas or liquid filling pressure type thermometer meter reading is not only related to the temperature of the bulb, and the influence of the capillary tube and spring temperature, which is influenced by ambient temperature, while adopted a certain amount of compensation method, but still can't make the influence of environment temperature fully compensated. Thus provides the scope when using the change of environmental temperature. Actual use should pay attention to this problem. 2) Should not be measured temperature close to room temperature. Because the measured temperature near the room temperature fluctuations, capillary and spring tube steam evaporation, condensation, can not correctly and timely reflect the changes of temperature. 3) When using measurement temperature must not exceed the limit. Once more than, wen bags all liquid vaporization, the saturated vapour pressure of the vapor pressure is not, so the relationship between the temperature response has changed, the measured results affirmation is not accurate, even due to the dramatic expansion of steam damage the instrument. 4) Pressure type thermometer capillary prone to rupture and leakage, when installation should pay attention to don't lay in the easily damaged or worn. After selecting the appropriate position slightly taut with clamps, with Angle iron protection, turning on the right angles. Capillary should not be high temperature heat source close to or contact with steam pipe, etc.