3. Theory on calibration
3.1 Multipoint adjustment
An ideal characteristic line of a sensor would be absolutely straight.
A real characteristic line of a humidity sensor curve is not straight, but slightly
bent. Hence, the aim must be to achieve a linearisation.
The Hygromer
®
sensor is by its nature linear between 30 and 100 %rh.
Below 30 %rh, there is a kink in the curve which needs linearisation.
Therefore, the adjustment point are set as follows:
1
st
point (Offset) 35 %rh
2
nd
point (Slope) 80 %rh
3
rd
point (Linearity between 30 and 10 %rh
4
th
point (Linearity between 10 and 0 %rh
Output
67
[F]
67
Output
Relative humidity
0
10 80
35
Adjustment points
\\Kalibrierung\Calibration_procedures_2.doc
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