Thermistor Beta Calculations

Those who work with coolants and air intake temperatures commonly deal with beta calculations. Beta calculations are used to help determine the types of thermistors that would be best employed in a device. Using Rt1, Rt2, t1, and t2, it is possible to acquire thermistors that give proper temperature measurement, control, and the ability to compensate. When you need to purchase a new or replacement thermistor, beta calculations will be a trusted friend.

The value gotten from beta calculations provides the shape of the curve. This curve represents the connection between the temperature of a thermistor and the resistance. The only way to achieve correct characteristics (at given temperatures when compared to the resistance of a particular application) is with the help of a beta value.

To calculate the beta value of a thermistor, you will need two-point calibrations. The Beta value is measured in the value °K (Kelvin). Four components are necessary to get the value. This includes:

Rt1 = Resistance at T. 1
Rt2 = Resistance at T. 2
T1 = T. 1 in °K
T2 = T. 2 in °K

If you are unfamiliar with this equation and these values, you should contact a thermistor company for more information. The engineers there will be able to help you pick the proper thermistors for your specific applications.

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