What are the instruments for measuring temperature? What are the principles?
Expansion of their basic principle type pressure type thermocouple and thermal resistance type infrared radiation characteristics of the several physical properties of heat exchange with the help of different objects and objects between the hot and cold with hot and cold changes to the indirect measurement of oh
Thermometers are measured by thermal expansion and cold contraction of mercury column (mercury) because of the high mercury density and the fact that the liquid metal is affected by temperature
The thermal resistance temperature sensing thermocouple temperature measurement infrared optical fiber temperature measuring thermal resistance temperature measurement principle: thermal resistance is the use of the resistance value changes with the temperature and change of this principle will be converted into temperature resistance temperature sensor quantity. A temperature transmitter obtains a resistance value (voltage / current) by applying a known exciting current to the thermal resistance, and converts the resistance value to a temperature value so as to achieve temperature measurement. There are three kinds of connection modes between thermal resistance and temperature transmitter: two-wire, three wire and four wire. Thermocouple temperature measurement principle: the combination of two kinds of conductors, the temperature into the thermoelectric motive sensor is called thermocouple.
