Contact type and non-contact thermometer advantages and disadvantages

Thousands of thermometer can be divided into contact and non-contact two kinds big, today let me introduce what they each have advantages and disadvantages. Often contact thermometer table is simple, reliable, high measuring accuracy; But because of the temperature measuring element and need to be fully measured medium heat transformers, and need some time to reach thermal equilibrium, so there is temperature measurement delay phenomenon, at the same time restricted by high temperature resistant material, can not be applied to high temperature measurement. And non-contact thermometer temperature measurement, such as infrared thermometer is through the principle of thermal radiation to measure temperature, temperature measuring element does not need to contact with the measured medium, infrared thermometer temperature range is wide, not limited by temperature measuring limit, infrared thermometer will not destroy the temperature field of the object to be tested, reaction speed is generally faster; But by the object emissivity, measuring distance, the influence of external factors such as dust and moisture, its measurement error is bigger. So high temperature generally choose the non-contact measurement; As for the accuracy, generally choose contact.