Memmert HCP 108, Руководство по эксплуатации

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HCP page 36
17.2 Humidity 17.2 Humidity
User-calibration of the unit at the controller, using two humidity points:
RH 20
Humidity calibration at 20% relative humidity
RH 90
Humidity calibration at 90% relative humidity
Either a positive or a negative calibration correction can be applied to each selected calibration point.
General calibration instructions:
1. Select the required calibration humidity in SETUP and set the corresponding calibration
correction to
0.0
°C.
2. Measure the deviation from the selected calibration humidity under steady conditions, using a
reference instrument.
3.
Set the calibration correction in SETUP. If the measured reference humidity is too low, the
calibration correction setting has to have a negative sign.
4.
Carry out a check measurement using the reference instrument.
5. The procedure can be carried out for up to 2 calibration humidities.
Example: Humidity deviation at the load at 90% has to be corrected:
1. Set calibration humidity in SETUP on
RH 90
and set the corresponding calibration correction
to
0.0
%
2. Using a calibrated reference instrument, an actual humidity of 88% is measured in normal
operation for a humidity setting of
90
%.
3. In SETUP set calibration correction for
RH 90
to
-2.0
%
4. The reference instrument should read 90.0% after the unit has settled down.
5. An additional calibration can be programmed with
RH 20
at 20% relative humidity.
rh 20
+3 %
rh 90
-2 %
factory
calibration
60% 40%
0%
20%
80% 100%