Two-point adjustment using a calibrator, Licl-nacl adjustment – Vaisala HMT100 User Manual
Page 32
User's Guide ______________________________________________________________________
32 __________________________________________________________________ M210701EN-D
Two-Point Adjustment Using a Calibrator
Note that the difference between the two reference humidities must be at
least 50 %. MI70 indicator is used now only as a terminal for visualizing
and setting the transmitter's RH reading.
Follow steps 1 to 7 on page 30 and continue as follows:
8.
Remove the filter from the transmitter's probe and insert the
probe head into the lower humidity reference condition.
9.
Press
ADJUST
to continue adjusting.
10. Choose
2-point adjustment
from the MI70 adjustment menu and
press
SELECT
.
11. Press
READY
when the reading has stabilized in the first reference
condition (may take 30 minutes or more). You can follow the
stabilization from the
GRAPH
display.
12. Enter the correct reference value in the first condition with the
arrow buttons. Press
OK
.
13. Remove the probe from the first reference condition and insert
the probe head into the higher humidity reference condition.
14. Press
READY
when the reading has stabilized in the second
reference condition (may take 30 minutes or more). You can
follow the stabilization from the
GRAPH
display.
15. Enter the correct reference value in the second condition with
the arrow buttons. Press
OK
.
16. Confirm the adjustment by pressing
YES
(by pressing
NO
you
return to adjustment mode display and no changes are made). If
the difference between the two reference conditions is less than
50 %RH, adjustment cannot be done.
17. The adjustment is done. Press
BACK
and
EXIT
to return to the
basic display.
18. Turn off the MI70 and detach the connection cable.
LiCl-NaCl Adjustment
This adjustment is done using relative humidity references 11.3 % RH
(LiCl) and 75.5 % RH (NaCl).
Follow steps 1 to 7 on page 30 and continue as follows:
8.
Remove the filter from the transmitter's probe and insert the
probe head into the LiCl salt chamber.
9.
Press
ADJUST
to continue adjusting.