Wohler DC 100PRO Bedienungsanleitung Seite 58

3. Signal menu, 4-Pa-test
3.5 Humidity measurements
Humidity measurements are activated when the ± key in the Signal Mode
menu is repeatedly pressed until the text "Humidity" appears with the unit of
measurement "%". The ENTER key confirms the selected measuring mode
and returns to the display. The diffusion aperture on the rear of the housing
should not be obstructed.
Fig. 3.5: Position of the humidity sensor
when the battery compartment
cover is removed
The humidity sensor is a laser-trimmed, capacitive sensor element with chip-
integrated signal processing. It can be retrofitted or replaced by the user as
well (order no. 7203) after the two calibration values Zero offset (here 0.833
V, Figure 3.6) and Slope (here 31.31 mV) have been entered under the Setup
menu. The slope value taken from the provided calibration record must be
rounded off to two decimal places (here 31.311 mV —> 31.31 mV).
Figure 3.6: Calibration record for a humidity sensor
3.6 Automatically alternating display
The program item Signal and then AUTO causes the display to alternate
between pressure, temperature, and air humidity values in the pressure and
temperature units chosen last.
58 Hotline: +49 2953 73-211
humidity sensor
Fax: +49 2953 73-250
Wöhler DC 100
PRO