The use of the second standard mercury thermometer

The mercury thermometer is one of the expansion thermometers. It not only can measure the temperature simply and intuitively, but also can avoid the error of the external remote thermometer. Used to measure temperatures in the range of 0--150°C or 500°C. It can only be used as an on-site monitoring instrument. After a long time use, there will be some failures. The following Xiaobian gives you a detailed introduction to the correct use and maintenance methods.

(1) Check before use. (Standard liquid temperature multi-comparison method can be used for calibration or more accurate thermometer verification.

(2) It is not allowed to use a measurement value whose temperature exceeds the maximum scale value of the thermometer.

(3) The thermometer has thermal inertia and should be read after the thermometer has reached a steady state. The reading should be read in the direction of the highest tangent to the temperature convex meniscus, looking straight.

(4) The mercury thermometer should be perpendicular to or inclined to the flow direction of the measured working fluid.

(5) Mercury thermometers often break mercury columns. The elimination methods are:

1 Cold repair method: insert the thermometer's temperature measurement bag into the dry ice and alcohol mixture (the temperature must not exceed -38 °C) to shrink, so that all the mercury in the capillary tube shrinks to the temperature measurement package.

2 Thermal repair method: Slowly insert the thermometer into a thermostatic bath slightly above the upper limit of the measurement, connect the mercury breakage section with the entire mercury column, slowly remove the thermometer, and gradually cool to room temperature in the air.

The above is the correct use and maintenance of the second-class standard mercury thermometer provided by Xiao Bian for everyone. We can do some reference based on the above content, hoping to help users understand more maintenance methods during use and reduce the use of the instrument during use. In the measurement error occurs, often maintenance and maintenance of the instrument can effectively improve the performance of the instrument.