Chapter 6 __________________________________________________ Calibration and Adjustment
VAISALA _______________________________________________________________________ 67
Manual Adjustment
Low End Adjustment
1.
Remove the filter and insert the probe into a measurement hole of
the dry end reference chamber (for example LiCl: 11 %RH) in the
humidity calibrator.
2.
Remove the filter and insert the probe into a measurement hole of
the dry end reference chamber (for example LiCl: 11 %RH) in the
humidity calibrator.
3.
Set the internal DIP switch
Calibration Enabled/Disabled
to
position
ON
and select RH calibration by using switches 3 and 4
DIP Switch Functions on page 45
4.
Press button
C
(
HMT360 without display
: press button
E
) to ignore
the automatic adjustment procedure. The humidity reading
measured by the transmitter appears on the display and on the
lower left corner you can see the text "Set Lo". If the transmitter
has no display, the LED indicator is blinking.
5.
According to the calibrator used, wait at least 10 ... 15 minutes for
the sensor to stabilize; use a multimeter or the transmitter display
to monitor the stabilization.
6.
Press buttons
Up
and
Dn
to adjust the display reading or
multimeter reading to correspond the reference value (when using
a multimeter calculate the current value corresponding to the
reference humidity by using the equations presented in
Correspondence of Current Values and Output Quantities on page
64
E
to conclude the low end adjustment.
7.
If the low end adjustment is sufficient, press button
E
again to
conclude the calibration and restore the DIP switch settings; set the
calibration DIP switch to position disabled (down). To continue
with the high end adjustment follow the instructions in next
section.
NOTE
If you use serial commands, please refer to section
.
