The description of the main tectonic pressure type thermometer

Work pressure type thermometer features is generally determined by the filling material, when filling material for gas, Generally for nitrogen) , as a result of the nitrogen pressure coefficient can be approximately regarded as an ideal gas. Linear relationship between pressure and temperature, so scale indicator for uniform linear scale. Pressure type thermometer of the 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 pressure type 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.