Gas filling thermometer is introduced

A, the working principle of gas filling thermometer gas filling thermometer also called pressure type thermometer, principle is based on the sealing temperature measurement system and the change of the relationship between temperature, gas pressure in 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. Second, fill the thermometer component gas filling thermometer thermometer consists of temperature sensitive element package, the pressure of capillary and bourdon tube pressure gauges. Recharge system as a gas, such as nitrogen, upper limit of temperature can reach 500 ℃, pressure and temperature close to the linear relationship, but the bulb volume is big, thermal inertia. Three, gas filling all immersed in the characteristics of the thermometer bulb must be measured medium; Capillary the longest do not exceed 60 m; Instrument accuracy is low, but the ease of use, and shock resistant.