Ntc Thermistor B Parameter Equation

Ntc thermistor elements come in many styles such as axial leaded glass encapsulated do 35 do 34 and do 41 diodes glass coated chips epoxy coated with bare or insulated lead wire and surface mount as well as rods and discs. The variable t is the ambient temperature in kelvin t0 is usually room temperature also in kelvin 250c 29815k b is the beta constant r is the thermistor resistance at the ambient temperature same as rt above and r0 is the thermistor resistance at temperature t0.

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Thermistors t r curve can be described in equations.

Ntc thermistor b parameter equation. The t in the equation you reference is just the temperature that the thermistor is at. But when we buy a thermistor the most of times it has specified the b parameter so we will use the b parameter equation 1t1t 0 1blnrr 0. 1 t a b ln rt clnrt 3 where rt the thermistor resistance at temperature t kelvin.

Simply put as temperature increases the thermistors resistance decreases. Ntc thermistors are non linear resistors that alter their resistance characteristics with temperature. Measuring temperature with an ntc thermistor august 15 2016 by joseph corleto for this article we are only concerned with one type of sensor that can measure temperature.

This sensor is called a thermistor. The typical operating temperature range of a thermistor is 55 0c to 150 0c. The thermistor block represents an ntc thermistor using the b parameter equation.

Note however that both the temperature points of t1 and t2 are calculated in the temperature units of kelvin where 0 0 c 27315 kelvin. The resistance at temperature t is r r 0 e b 1 t 1 t 0. T represent the temperature in kelvin t 0 represent 25 o c or 29815k r 0 represent the resistance at t 0 in our case for model ntcm hp 50k 1 r50k.

The manner in which the resistance of a thermistor decreases is related to a constant known in the thermistor industry as beta b. If you want to find t as a function of r then you need the inverse of that function. The most commonly used form is the steinharthart equation shown below.

That is b t1t2 or b 25100 with typical ntc thermistor b values given anywhere between about 3000 and about 5000. A b c the thermistors constants. 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.

Therefore the b value will define the thermistors material constant between the range of t1 and t2. The assumption here is that you want to find the resistance r of the thermistor as a function of the temperature t.

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