The thermistor is sensitive element a resistance value will slowly varies with temperature, it is in the range of operating temperature, the resistance value will slowly rising temperature increase is a positive temperature coefficient (PTC) resistor; and the resistance decreases with the temperature rising even negative temperature coefficient (NTC) thermistor. Let's talk about the thermal resistor
The metal thermistor, its resistance value with the increase of temperature increases linearly, while the temperature coefficient of resistance around +0.004K-1. While the average negative temperature coefficient thermistor. The resistance value will be with the increase of temperature decreases, room temperature coefficient of resistance temperature is -0.02K-1 ~ -0.06K-1. Finally, even if the critical thermal resistor (CTR), the resistance value will be in the vicinity of a specific temperature with the increase of temperature sharply reduced, and his change quantity can reach 2 ~ 4 orders of magnitude. Curve 4A and 4B are barium titanate positive temperature coefficient thermistor. The former is delayed, room temperature coefficient of resistance temperature is about +0.03 ~ +0.08K-1; the latter is a switch type, so it will be in the range of a low temperature resistance, sharp increase of several orders of magnitude, and the temperature coefficient of resistance can reach +0.10 ~ +0.60K-1.