Licl-nacl adjustment – Vaisala HM70 User Manual
Page 57
Chapter 9 ______________________________________ Calibration and Adjustment of Transmitters
VAISALA _______________________________________________________________________ 55
16. Give the higher reference humidity value by using the arrow
buttons. Press
OK
.
17. Confirm the adjustment, press
YES
(by pressing
NO
you
return to adjustment mode display and no changes are made). If
the difference between two references is less than 50 %,
adjustment can not be done.
18. Adjustment is done. Press
BACK
to exit the adjustment mode
press
EXIT
to return to the basic display.
LiCl-NaCl Adjustment
This adjustment is done by using relative humidity references: 11.3 %
RH (LiCl) and 75.5 % RH (NaCl)
If you use humidity calibrator HMK15, please use the adapter fitting
(13.5 mm) on the measurement hole if you calibrate probes of
HMT334, HMT335, HMT337 and HMT338.
Follow the steps from 1 to 8 on page 52 and continue as follows:
9.
Remove the filter from the transmitter's probe and insert the
probe into 11.3 % RH reference humidity.
10. Press
ADJUST
to continue adjusting
.
11. Select
LiCl-NaCl autom.
, press
SELECT.
Press
OK
to accept the
note telling about references.
12. Press
READY
when the reading is stabilized in the first
reference condition (takes about 30 minutes or more)
.
13. Remove the probe and insert the probe into 75.5 % reference
humidity. You can follow the stabilization from the
GRAPH
display (takes about 30 minutes or more).
14. Press
READY
when the reading is stabilized in the second
reference condition
.
15. Confirm the adjustment, press
YES
(by pressing
NO
you
return to adjustment mode display and no changes are made).
16. Adjustment is done. Press
BACK
to exit the adjustment mode
press
EXIT
to return to the basic display.