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NTC Temperature Sensor

NTC temperature calculation method

1. B value calculation method
2. Steinhart-Hart equation.
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NTC temperature calculation method

There are two common NTC temperature calculation methods: 

 B value calculation method and Steinhart-Hart equation.

1. B value calculation method: R = R(25℃)•exp[B•(1/T-1/298.15)]

①T is the absolute temperature K (Kelvin temperature)

②R(25℃) is the resistance value of the thermistor at 25℃ (unit is Ω)

2. Steinhart-Hart equation calculation method:

1/T = A + B•ln(R) + C•[ln(R)]

①T is the absolute temperature K (Kelvin temperature)

②R is resistance value (unit is Ω)

③A, B and C are the coefficients of the equation. These three numbers depend on the style and model of the thermistor, and the temperature range.

QQ图片20200826152436.png


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NTC Negative Temperature Coefficient Thermistor R-T Characteristics

QQ图片20200826153853.png

Schematic diagram of R-T characteristic curves with the same B value and different R resistance values

QQ图片20200826153955.png

Schematic diagram of R-T characteristic curves with the same R resistance and different B values

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