Vaisala HM70 - Manual (Page 55)

Chapter 9 ______________________________________ Calibration and Adjustment of Transmitters
VAISALA _______________________________________________________________________ 53
From now on the adjustment is carried out by using the MI70
indicator.
7. Press OK to start adjustment.
8. Select RH or T, press SELECT.
9. If RH selected, check the environment settings, if needed.
Otherwise press
NO.
Field Checking and Adjustment by
Using a Calibrated Reference Probe
Follow the steps from 1 to 8 on page 52 and continue as follows:
9. Check that the probes are located in equal conditions and wait
until the readings are stabilized (can take 30 minutes or more). If
you are near the probes, do not breathe in their direction.
10. Press ADJUST to continue adjusting .
11. Press To same asRH
Ii/I
, press SELECT. (MI70 recognizes always
the port to which the HMP70-series probe is connected).
12. Confirm by pressing YES.
13. Adjustment is done. Press BACK and EXIT to return to the
basic display.
14. Switch off the MI70 and detach the calibration cable.
1-Point Adjustment by Using a
Calibrator
When adjusting a transmitter only in one reference condition, please
take care that the reference condition represents the measuring
environment. MI70 indicator is used now in communication.
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: