Comparison of properties of three common temperature sensors in the customization of heating tube -----

Time：2022-11-12 15:13:01 Page view：

When we use the heating tube, many times we need to use the temperature sensor to detect the working temperature of the heating tube, so as to accurately grasp and control the heating temperature of the heating tube. The different use scenarios and functional requirements of the heating pipe are different, and the temperature sensor requirements used are also different. The properties and advantages and disadvantages of common temperature sensors are compared as follows:

Temperature sensor attribute comparison

Standard	Thermocouple	Thermal resistance (RTD)	Thermistor
temperature range	Very wide -450°F +4200°F	wide -400°F +1200°F	narrow -100°F +500°F
replaceability	Good	excellent	Fall short of
long-term stability	Fall short of	good	difference
accuracy	medium	high	medium
repeatability	ordinary	excellent	Average to good
Sensitivity (output)	low	medium	very high
reply	Medium to fast	medium	Medium to fast
linearity	moderation	good	difference
self-heating	not	Very low to low	high
Point (end) sensitive	excellent	moderation	good
Lead effect	high	medium	low
Size/Packaging	small to Medium	Medium to small	Small to medium

Comparison of advantages and disadvantages of temperature sensor

Sensor	Advantage	Drawback
Thermocouple	No resistance lead problem Fast reaction speed Simple and robust High quality and low price High-temperature operation Point temperature sensing	nonlinearity undervoltage Most unstable and repeatable Least sensitive
Thermal resistance (RTD)	The most stable and accurate contamination-resistant More linear than thermocouples Zone temperature sensing The most repeatable temperature measurement	Required current source Slow self-heating response time Low sensitivity to small temperature changes
Thermistor	High yield, fast speed Two-wire ohm measurement economical Point temperature sensing	nonlinearity Limited in scope Relatively vulnerable Requires current to be derived from heat

Comparison of advantages and disadvantages of temperature sensor In the heat pipe customization application temperature sensor, the three common temperature sensors can be selected according to the functional requirements of the actual customized heat pipe.

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