What is the pressure type thermometer

What is the pressure type thermometer? Pressure type thermometer is based on the sealing temperature measuring system and saturated vapor pressure of liquid evaporation temperature, the change of the relationship between the thermometer for temperature measurement. 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. Bag when I feel the temperature change when 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 and direct reading, etc. Almost set the glass rod pressure type thermometer thermometer, bimetallic thermometer, gas pressure thermometer all advantages. Pressure type thermometer main structure: 1, the bulb: it is direct with contact to feel the temperature change of measured medium components, so it has high strength, small expansion coefficient, high thermal conductivity and corrosion resistance and other properties. According to the working material and filling of different measured medium, temperature, package can be produced from copper alloy, steel or stainless steel. 2, capillary: it is made of materials such as copper or steel cold pulling into seamless tube, used to pass the pressure change. The outside diameter of 1. 5 ~ 5 mm, inner diameter of 0. 15 ~ 0. 5mm。 The diameter of the if it is fine, the longer the length, the transmission pressure lag phenomenon is more serious. In other words, the temperature to be measured thermometer is slow. However, under the same length, the capillary is fine, the higher the precision of the instrument. Capillary are easy to be broken, broken, therefore, must be protected. To often do not bend the capillary available metal hose do protect casing. 3, spring tube: it is the general pressure gauge with elastic element. Pressure type thermometer is currently the most widely use scope, performance is one of the most comprehensive mechanical thermometer table. Pressure type thermometer is widely used in machinery, textile, chemical, pharmaceutical, food industry for the temperature measurement and control in the process of production.