How pressure type thermometer temperature?

Pressure type thermometer is the use of liquid or gas pressure or volume made of the characteristics of non-contact temperature sensor with temperature change. As a result of the change of pressure change in the curvature of spring tube, and the free end displacement, through the connecting rod and direct drive gear drive the pointer on the dial indicator temperature changes in the value. About it how to measuring temperature, is also a concern of everyone, I'm afraid. The principle of pressure type thermometer is based on the sealing temperature measuring system of liquid evaporation changes in the relationship between saturated vapor pressure and temperature, the temperature measurement. When bulb feel temperature, saturated vapor produced the corresponding pressure in the closed system, cause the change of curvature elastic element, make its produce a shift in the free end, again by the displacement amplification mechanism of gear into the indicated value. The thermometer with a bulb small volume, fast response, high sensitivity, intuitive, can remote reading, etc. Pressure type thermometer bulb, capillary, spring tube ( Bourdon tube) , moving mechanism and pointer. Bulb contact measured object, carries on the heat equilibrium. Filling in airtight package, capillary pressure and the spring tube material ( Or volume) With the temperature changes. As a result of the change of pressure change in the curvature of spring tube, and the free end displacement, through the connecting rod and direct drive gear drive the pointer on the dial indicator temperature changes in the value. In addition, still should have sufficient strength, so that the vessel with thin wall under high pressure difference inside and outside. Usually, made of stainless steel or brass bulb, brass can only be used in the corrosive medium. After the bulb is heated, will make internal work material temperature and pressure, the pressure by the capillary to spring tube, spring tube to produce deformation, and driven by the transmission system pointer, indicating the corresponding temperature value. Current production of pressure thermometer according to different work within the material filling the closed system can be divided into filling gas pressure and steam pressure thermometer thermometer.