☑ Ntc Resistance Equation

The approximation of the relationship of temperature and resistance is good enough for most applications. An ntc thermistor is a thermally sensitive resistor whose resistance exhibits a large precise and predictable decrease as the core temperature of the resistor increases over the operating temperature range.

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Here r is the resistance in w and t the absolute temperature in k k kelvin.

Ntc resistance equation. Ntc thermistors steinhart and hart equation the steinhart and hart equation is an empirical expression that has been determined to be the best mathematical expression for resistance temperature relationship of ntc thermistors and ntc probe assemblies. This is a general curve fitting equation to accommodate all ntc type resistors. Calculate its resistive value at 25 o c and again at 100 o c.

Simply put as temperature increases the thermistors resistance decreases. Ntc negative temperature coefficient thermistors change their effective resistance over temperature. The steinharthart equation is a model of the resistance of a semiconductor at different temperatures.

Enter the thermistor values click calculate. Ntc thermistors are non linear resistors that alter their resistance characteristics with temperature. A 10kw ntc thermistor has a b value of 3455 between the temperature range of 25 o c and 100 o c.

1 t a 0 a 1 ln r a 2 ln r 2 a 3 ln r 3. The manner in which the resistance of a thermistor decreases is related to a constant known in the thermistor industry as beta b. Where r is the resistance of the thermistor at temperature t in kelvins.

R1 is the thermistors resistance at temperature t1 in ohms. With ntc thermistors resistance decreases as temperature rises. The equation is where is the temperature in kelvins is the resistance at in ohms.

The most common equation used to model this change is the steinhart hart equation. An ntc is commonly used as a temperature sensor or in series with a circuit as an inrush current limiter. Note that the equation needs the constants a b and c.

B 3455 r1 10kw at 25 o. Thermistor resistance value at target temperature. An ntc is commonly used as a temperature sensor or in series with a circuit as an inrush current limiter.

Based on a measured resistance value of an ntc thermistor the extended steinhart hart equations allows a simple calculation of the temperature. It uses three coefficients to characterize the ntc material with great accuracy. R2 is the thermistors resistance at temperature t2 in ohms.