It generally refers to a type of instrument that does not come into contact with a high-temperature object, but uses the radiation formula to calculate the temperature of the object by measuring its radiant heat.

Using non-contact temperature measurement, the temperature sensitive element does not contact the measured object, but exchanges heat through thermal radiation, or the temperature sensitive element receives part of the thermal radiation energy of the measured object, and the measured object is deduced from the size of the thermal radiation energy. the temperature of the object. With this method, the temperature measurement response is fast, and the interference to the measured object is small. It can measure the high temperature, the moving measured object, and the occasions with strong electromagnetic interference and strong corrosion. Disadvantage: low precision. Common contact temperature measurement: thermal resistance, thermocouple, bimetal thermometer, non-contact temperature measurement: photoelectric pyrometer, radiation thermometer, colorimetric thermometer, handheld infrared thermometer.
The radiation pyrometer is a non-contact simple radiation temperature measuring instrument. It measures the surface temperature of the object according to the principle of the thermal radiation effect of the object. It is suitable for continuous measurement of various furnaces, high temperatures in metallurgy, machinery, silicate and chemical industries. The temperature of the cellar, salt bath and other occasions, as well as other places where it is not suitable to install thermocouples, can be indicated and recorded to automatically adjust the measured temperature with appropriate display instruments.