What is temperature NTC?
NTC stands for “Negative Temperature Coefficient”. NTC thermistors are resistors with a negative temperature coefficient, which means that the resistance decreases with increasing temperature. They are primarily used as resistive temperature sensors and current-limiting devices.
What is NTC on thermostat?
NTC Thermistors are non-linear resistors, which alter their resistance characteristics with temperature. The resistance of NTC will decrease as the temperature increases. The manner in which the resistance decreases is related to a constant known in the electronics industry as beta, or ß.
How does NTC temperature sensor work?
With an NTC thermistor, when the temperature increases, resistance decreases. Conversely, when temperature decreases, resistance increases. This type of thermistor is used the most. Typically, a thermistor achieves high precision within a limited temperature range of about 50ºC around the target temperature.
How is the temperature of a NTC thermistor calculated?
The alpha value is used to calculate the temperature coefficient of a NTC thermistor at a temperature point. For NTC thermistors, the alpha or temperature coefficient is expressed in units of a minus percent resistance change per degree Celsius.
How to calculate the resistance with a NTC?
Common NTCs have β values in the 3’000 to 5’000 K range. With these parameters the resistance (or the temperature) can be calculated as follows: These equations use the absolute temperature in Kelvin (K), if you use a different scale, you should convert it first.
Which is better for temperature measurement PTC or NTC?
However, PTC thermistors have a sort of tipping point and greatly change the resistance at some temperature. This makes the PTC thermistor a little harder to interface with. For this reason, for most low-cost temperature measurement, NTC thermistors are preferred.
Is the Your 25 and β of a NTC factory calibrated?
Furthermore, NTCs are usually not factory calibrated: the actual R 25 and β vary from one NTC to another and some sort of circuit adjustment or calibration is always required to do absolute and precise temperature readings.