Termistors – (NTC, PTC, PT100, PT1000) Thermistors are made of semiconductor materials, and most of them have negative temperature coefficients, that is, the resistance decreases as the temperature increases. Temperature changes cause large resistance changes, so it is the most sensitive temperature sensor.

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However, the linearity of the thermistor is extremely poor and has a lot to do with the production process. The manufacturer cannot give a standardized thermistor curve. Thermistors are very small and respond quickly to temperature changes. But the thermistor requires a current source, and its small size also makes it extremely sensitive to self-heating errors. The thermistor measures absolute temperature on two lines and has better accuracy, but it is more expensive than a thermocouple and its measurable temperature range is smaller than a thermocouple. A commonly used thermistor has a resistance of 5kΩ at 25°C, and every 1°C temperature change causes a resistance change of 200Ω. Note that the 10Ω lead resistance only causes a negligible 0.05°C error. It is ideally suited for current control applications requiring fast and sensitive temperature measurements. The small size is advantageous for applications with space requirements, but care must be taken to prevent self-heating errors. Thermistors also have their own measurement techniques. The advantage of the thermistor is that it is small and can stabilize quickly without causing thermal load. However, it is also very fragile, and large currents can cause self-heating. Since the thermistor is a resistive device, any current source will cause heat to be generated by power across it. Power is equal to the square of the current times the resistance. Therefore use a small current source. If the thermistor is exposed to high heat, permanent damage will occur. Through the introduction of two temperature probes, I hope it will be helpful to everyone’s work and study.