Vaisala HM70 - Manual (Page 47)

Chapter 9 ______________________________________ Calibration and Adjustment of Transmitters
VAISALA _______________________________________________________________________ 45
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 42 and continue as follows:
8. Remove the filter from the transmitter's probe and insert the
probe into the LiCl salt chamber.
9. Press ADJUST to continue adjusting.
10. Choose LiCl-NaCl autom. from the MI70 adjustment menu, press
SELEC T. Press OK to accept the note telling about references.
11. Press READY when the reading has stabilized in the LiCl salt
chamber (may take 30 minutes or more). You can follow the
stabilization from the
GRAPH display.
12. Remove probe from the LiCl salt chamber and insert the probe
into the NaCl salt chamber.
13. Press READY when the reading has stabilized in the NaCl salt
chamber (may take 30 minutes or more). You can follow the
stabilization from the
GRAPH display.
14. Confirm the adjustment by pressing YES (by pressing NO you
return to adjustment mode display and no changes are made).
15. The adjustment is done. Press BACK and EXIT to return to the
basic display.
16. Turn off the MI70 and detach the connection cable.
Calibration and Adjustment of HMP230/240
Transmitters and HMM210 Modules
You are able to check and adjust only humidity channel, temperature
channel can only be checked. Calibrate your transmitter/module
against a calibrated reference probe of HM70 or against a calibrator's
reference humidity by using MI70 indicator in communication.
Follow the first 12 steps and continue according to the chosen
calibration method.
1. In case you have a transmitter provided with heated probe, carry
out these preparations before calibration.