Vaisala HMP140 - Manual (Page 14)

HMP140A SERIES
Operating Manual
U175en-1.5
10 1999-12-08
•
Use the RH offset potentiometer (see Figure 4.2) to adjust the output
signal to the value given in the calibration table (Chapter 4.4).
•
Place the probe into the calibration hole of the NaCl bottle in the
calibrator.
•
Wait for 10 minutes.
•
Check that the reading corresponds within the desired accuracy to the
reading given in the calibration table. If not, adjust the reading with
the RH gain potentiometer (see Figure 4.2).
•
Check again the reading at the first point and adjust if necessary.
DISPLAY CONNECTOR
Tgain
Toffset
RHoffset
RHgain
PROBE CONNECTOR
Figure 4.2 Calibration potentiometers
4.3 Temperature calibration
One point temperature calibration can be performed with the HMI41 equipped
with an appropriate probe and optional calibration cable if the accuracy of
+0.5
°
C is sufficient. For further details, see the operating manual of the
HMI41 and calibration option.