Convert Thermistor Reading VI
- Updated2025-01-28
- 3 minute(s) read
Convert Thermistor Reading VI
Converts a thermistor voltage into a temperature. This VI has different modes of operation for voltage-excited and current-excited thermistors. Wire data to the Voltage input to determine the polymorphic instance to use or manually select the instance.
The Convert Thermistor Reading VI has two modes of operation for use with different types of thermistor circuits. The following illustration shows how the thermistor can be connected to a voltage reference.
The following illustration shows a circuit where the thermistor is excited by a constant current source.
If the thermistor is excited by voltage, the following equation shows the relationship of the thermistor resistance, RT, to the input values.
If the thermistor is excited by current, the following equation shows the relationship of the thermistor resistance, RT, to the input values.
The following equation shows the standard formula the VI uses for converting a thermistor resistance to temperature.
The values used by this VI for A, B, and C are given below. If you are using a thermistor with different values for A, B, and C (refer to the thermistor data sheet), you can edit the VI diagram to use different A, B, and C values.
A = 1.295361E-3
B = 2.343159E-4
C = 1.018703E-7
The VI produces a temperature in degrees Celsius. Therefore, TC = TK – 273.15.