The use of temperature sensors

According to the use of temperature sensor, usually divided into two categories, contact and non-contact.

a, temperature sensors, Thermocouple, heat resistance contact

by heat balance principle, the two objects after contact, after a long enough to reach thermal equilibrium, then their temperature must be equal. If one of them is the thermometer ( The thermocouple or heat resistance) , you can use to another object temperature measurement, this way of measuring temperature is called contact temperature measurement. Therefore, stable precision is very high. Contact temperature measurement, temperature sensing element to contact with a good object to be tested, tend to destroy the thermal equilibrium state of the object to be tested, and the assimilation object to be tested, make its temperature. Should this, structure, performance requirements for temperature sensing element is quite high.

2, temperature sensors, Thermocouple, heat resistance and non-contact

by using the principle of thermal radiation can change with the temperature of the object temperature measurement object. This way of measuring temperature is called the book of non-contact temperature. His characteristic is: no contact with the object being measured, also do not change the object to be tested temperature distribution, thermal inertia is small. Principle of temperature sensor from the point of view, in this way temperature without limit. Usually used to measure 1000 degrees above the move, rotate or reflect rapidly the temperature of the high-temperature object or surface temperature.

temperature sensors thermal resistance temperature measurement is based on the metal conductor resistance value increases with the increase of the temperature of the properties for temperature measurement. Thermal resistance temperature sensor mostly made of pure metal materials, the application at present most is platinum and copper, in addition, now has started using survey, nickel, manganese and rhodium materials such as thermal resistance temperature sensors.