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How to differentiate between mercury thermometer first-class and second-class mercury thermometer?

2020-11-26

JVTIA

197

Mercury thermometer is the use of mercury in thermal bubble and is still within the capillary rise cold principle to measure temperature. Mercury thermometer standard mercury thermometer can be divided into a first-class and second-class standard mercury thermometer. A first-class standard mercury thermometer is made by measuring temperature range of 0 ~ - 60 ℃ mercury thermometer and temperature in the range of - 30 ~ 300 ℃ 9 group, and 300 ~ 500 ℃ of four groups of mercury thermometer, a total of 14. Scope of three thermometers can separate a range of verification. It is used as a measurement of the standard of second-class standard mercury thermometer. Index value of the thermometer and allowed error below: second-class standard mercury thermometer consists of temperature range of 0 ~ - 60 ℃ mercury thermometer and temperature in the range of - 7 group, 30 ~ 300 ℃ and 300 ~ 500 ℃ of four groups of mercury thermometer, a total of 12 teams. It is used as a verification work, by the standards of the thermometer can also be used for precise temperature measurement. The degree of the thermometer value and permissible error as below:

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