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Types, characteristics and selection of contact and non-contact temperature sensors

Published on: September 26, 2020 by Zetian sensing

Generally speaking, according to the Temperature sensor Generally, there are two types of contact method and non-contact method. The characteristic of contact method is that the thermometer should have good thermal contact with the object to be measured. Generally speaking, the contact type temperature measuring instrument is relatively simple, reliable and has high measurement accuracy; however, due to the need for sufficient heat exchange between the temperature measuring element and the measured medium, it takes a certain time to reach the thermal balance, so there is a delay phenomenon of temperature measurement. At the same time, due to the limitation of high temperature resistant materials, it can not be applied to very high temperature measurement. Thermocouple, thermal resistance and other temperature sensors are generally in the form of contact, as shown in the figure platinum resistance rod temperature sensor is a typical form of contact temperature measurement.

 Temperature sensor test

The non-contact method uses the principle that the thermal radiation energy of the object changes with the temperature to measure the temperature of the object. Its characteristics are: it does not contact with the object to be measured, and does not change the temperature distribution of the object to be measured, and the thermal inertia is small. The temperature measurement is not affected by the temperature measurement principle of the object, such as the temperature measurement of the upper limit of the temperature measurement device, which is not affected by the temperature measurement of the upper limit of the temperature measurement device, and is not affected by the temperature measurement of the upper limit of the temperature measurement device. For example, infrared thermometer is a typical non-contact instrument.

The following table shows the types and characteristics of commonly used temperature sensors. Select the appropriate temperature sensor according to different measuring situations

principle type Operating temperature range (℃) Value transfer temperature range (℃) Accuracy (℃) Linearization response speed Record and control Price
expand Mercury thermometer organic liquid thermometer bimetal thermometer -50~650 -100~200 -50~500 -50~550 -100~200 -50~500 0.1~2 1~4 0.5~5 Can can can Medium medium slow Not suitable not suitable suitable Cheap
pressure Liquid pressure thermometer -30~600 -20~350 -30~600 -20~350 0.5~5 0.5~5 Not really Zhongzhong fit Cheap
resistance Platinum resistance thermometer -260~1000 -50~350 -260~961 -50~350 0.01~5  0.3~5 Good and bad Medium fast fit in
Thermoelectric EMF Thermoelectric thermometer B S·R 0~1800 0~1600 0~1600 0~1300 4~8 1.5~5 cocoa fast fit in
N K E T J 0~1300 -200~1200 -200~800 -200~800 -200~350 0~1200 -180~1000 -180~700 -180~600 -180~300 2~10 2~10 3~5 3~10 2~5 Good, good, good, good fast fit in
thermal radiation Optical pyrometer 700~3000 900~2000 3~10 wrong unsuited in
Photoelectric pyrometer radiation thermometer ; Colorimetric Thermometer 200-3000 , about 100-3000 180-3500 600~2500 — — 1~10 5~20  5~20 wrong Fast medium fast fit expensive

This article originates from Zetian sensing Please keep the source.