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
Marking |
Function |
|
|---|---|---|
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 = 2.7kΩ
B = 3900
