Sensors¶
Measurement principal¶
The device carries out a temperature measurement at an adjustable interval for a connected NTC sensor, stores the values and, if possible, forwards them to the server.
The device has one integrated analogue digital converter (ADC) for connecting one NTC sensors.
NTC connections¶
| None | Either NTC connection can be attached. |  |
|---|---|---|
| None | Either NTC connection can be attached. |
Conversion of the resistance value into a temperature value
The resistance of an NTC thermistor, in a function of temperature is described as:
Rt = R25 x e((-B/T)-B/T25))
R25 is the resistance in at 25°C.
B is the constant, characteristic for a thermistor.
T is the absolute temperature.
T25 is 25°C in K (298.15K).
Characteristic Curve¶
Example of a characteristic curve of an NTC thermistor with the following parameters:¶
R25 = 2.7kٶ
B = 3900¶
