| Type Function |
REAL |
| Input T |
REAL (temperature in °C) |
| RN |
REAL (resistance at 25°C) |
| B |
REAL (characteristic value of the sensor) |
| Output |
REAL (resistance) |
|
RES_NTC calculated the resistance of an NTC resistance sensor from the input values T (temperature in °C) and RN (resistance at 25°C). The input value B is a constant value which must be read in the data sheets of that sensor. Typical values are at NTC sensors 2000 - 4000 Kelvin. |
| The calculation is done using the formula |
|
|
The formula provides a sufficient accuracy for small temperature ranges, eg 0-100°C. For wide temperature ranges the formula according to Steinhart is more suitable. |
