Summary Of Thermometer Principle And Characteristics

How all thermometers work

1 Overview

Thermometer is a tool that can accurately judge and measure temperature. It is divided into pointer thermometer and digital thermometer.

Pointer thermometer is a kind of field testing instrument for measuring low and medium temperature. The pointer thermometer can directly measure the temperature of liquid, steam and gas medium in the range of -80 ℃ ～ + 500 ℃ in various production processes.

The digital thermometer can accurately judge and measure the temperature. It is displayed digitally instead of the pointer or mercury. So called digital thermometer or digital thermometer.

Digital thermometers are one of the types of temperature measuring instruments. According to the different temperature-measuring substances and temperature ranges used, there are kerosene thermometers, alcohol thermometers, mercury thermometers, gas thermometers, resistance thermometers, thermocouple thermometers, radiation thermometers, light thermometers, and bimetal thermometers.

2.Principle

Depending on the purpose of use, a variety of thermometers have been designed and manufactured. The basis of its design are: the use of solids, liquids, and gases that are subject to thermal expansion and contraction under the influence of temperature; under constant volume conditions, the gas (or vapor pressure changes due to the difference in temperature; the role of thermoelectric effects; resistance with Transform and transform; the effect of heat radiation and so on.