How to ensure accurate pressure type thermometer

Pressure type thermometer is based in an airtight container of the pressure changes over temperature of heat medium principle for measuring temperature. The temperature measurement system is a warm bag, connection of capillary and bourdon tube, a closed system of the internal filling temperature inductive medium. Bulb after heating, the increased pressure along the connection capillary conduction and bourdon tube pressure gauge, and the elastic deformation of spring tube through the drive mechanism make the pointer along the scale plate deflection, which indicate the temperature. Because of the pressure type thermometer into the lab is usually a follow-up verification and use of verification, so the verification of the technical requirements and test methods as follows: 1, with the appearance of the visual check thermometer. Thermometer protection should maintain a transparent glass, use the meter shall not interfere with the correct reading of defective. The components of the thermometer should be assembled firmly, do not get loose, and can not have the phenomenon such as corrosion and anticorrosion layer falls off. 2, thermometer calibration methods: value for pressure type thermometer bulb need all permeated the measured medium, with standard thermometer and checked after a stable value for thermometer readings. The pressure type thermometer header and bulb height difference is not more than 1 cm. When pressure type thermometer after verification according to verification regulations, does not conform to the rules of error of requirements, but the value of error of close, namely for simple repair. Open the glass panel of the thermometer, needles with take out a pointer, relocation of a certain temperature point, again according to the procedures to check, give a new error value. When pressure type thermometer according to regulations after verification, does not conform to the rules of error of request, but a linear change of error, the transmission system of the need to adjust the pressure type thermometer. If pressure type thermometer according to the rules of irregular change of error after verification, the thermometer can only according to the regulations issued by the notice of verification results.