Pressure type thermometer maintenance1

Pressure type thermometer closure closed system to produce no seal, mostly is connected to the capillary tube joint welding not good, or bulb flat. Spring tube, capillary crack phenomenon is also some, but not common. Some thermometer placed a few months, low value, adjust good reuse or low, it is because of the closed system does not seal. The examination of the pressure, should pay special attention to. Package leak sealing system of welding temperature, available copper welding repair ( On a scale of 0 - Low boiling point liquid filling pressure of up to 100 degrees Celsius thermometer, temperature for soldering repair) 。 Capillary crack, break can be truncated, the capillary with method of casing connection. If the flat bourdon tube itself, it should be replaced. If use soldering repair, the change of the characteristics of spring tube or irregular errors. Of course more than repair is performed under the condition of the conditional and best send factory repair. Low boiling point liquid summary judgment according to the instrument pointer position judgment, hand bag, or in the hot water, if the pointer is motionless, the instrument and the parts before, so can conclude that the sealing system is not sealed. Referred to in the indicating instrument temperature value is charged by the low boiling point liquid boiling point temperature under atmospheric pressure, or gauge pressure is zero in the boiling point temperature. For example refers to to - 24 degrees Celsius is methyl chloride boiling temperature, mean to 12 degrees Celsius chloroethane boiling temperature, etc.