The composition and classification of pressure type thermometer

The principle of pressure type thermometer is based on a closed gas evaporation of the liquid saturation pressure on the temperature measurement system and the change of the relationship between temperature, and 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. Today we will talk about the pressure type thermometer for the composition and classification. Pressure type thermometer by a temperature sensor, the pressure of capillary and bourdon tube pressure gauges. If as a gas recharge system, such as nitrogen, it is called a inflatable pressure type thermometer, temperature limit of up to 500 ℃, the relationship between the pressure and temperature is close to linear, but wen package volume is big, thermal inertia is big; If filled with liquids, such as dimethyl benzene, methanol, bulb, temperature measuring range, respectively 40 ℃ to 200 ℃ and - 40℃~170℃； If filled with low boiling point liquid, the saturation vapor pressure should be changed according to the measured temperature, such as acetone, used in 50 ℃ ~ 200 ℃, but due to the saturation vapor pressure and saturated steam temperature is nonlinear relationship, so the thermometer calibration is not uniform. Using pressure type temperature time, the temperature must be package in all tested medium; Capillary the longest do not exceed 10 m; Use simple remote, oil filled pressure type thermometer can be shock resistant.