COSA Xentaur Hygrocontrol Type 86 Ex - Manual (Page 18)

3.2.3 When makes a Calibration Sens?
If you decide to do a recalibration, you first should detect the deviation
which arised from the last recalibration. Our probes are calibrated at 7
points at least, to get a very close fit to the real sensor characteristic. If
you see a deviation of more than 5%RH when trying to recalibrate a
point, you should stop the calibration and delete the calibration memory
totally.Otherwise you migth generate a characteristic with different
encreases from point to point. After a successfull delete of the memory,
you should now calibrate 0 and 80%RH values, which result in a linear
characteristic which has mostly less than 2%RH deviation from the
sensors real characteristic.
3.2.4 Calibrating more Fixpoints
To come to even more accurate values more points should be calibrated.
With 7 or 8 points a deviation of ± 0,5 % r. F. may be reached over the
total range. At Instruments without display Calibration is managed by
Code switch „S1” and Jumper „X4“. LED „H3“ gives informations about
the state of the calibration procedure.
HYGROCONTROL Manual for Type 86 Ex Page
17