Chapter 5 _______________________________________________________________ Maintenance
VAISALA ________________________________________________________________________ 63
Adjustment Procedure Using MI70 Indicator
(HMP110 and HMP113)
NOTE
The probe cannot be used with the MI70 hand-held indicator when the
probe is in analog mode. To use the probe with MI70, enable the serial
mode as instructed in Accessing Serial Line Command Interface (RS-
485 Mode) from Analog or Modbus Mode on page 36. To return to
analog mode, use the
smode analog
serial line command (see Set Serial
One-Point Adjustment of RH
Measurement (HMP110 and HMP113)
NOTE
If you want to perform a two-point adjustment instead of a one-point
adjustment, use the serial line. See Two-Point Adjustment of RH
Measurement (HMP110 and HMP113) on page 60.
To perform a one-point adjustment to the capacitance measurement of
the HMP110 or HMP113 using the MI70 indicator, you need:
- MI70 indicator.
- Connection cable for MI70 indicator (219980).
- One humidity reference. One-point adjustment with a single
< 50 %RH reference will adjust the
offset
parameter of the
measurement. One-point adjustment with a single > 50 %RH
reference will adjust the
gain
parameter of the measurement.
The procedure below uses the HMK15 Humidity Calibrator. LiCl salt (11
%RH) is used as the reference point.
1.
Connect the probe to Port I of the MI70 indicator.
2.
Turn on the MI70 indicator.
3.
Start the adjustment sequence from
Main menu > Functions >
Adjustments
.
4.
MI70 notifies you that automatic power off is disabled during
adjustment mode, press
OK
to acknowledge.
5.
Select the
RH
parameter when prompted.
6.
Now the adjustment mode is on, press
ADJUST
to select the
adjustment method.
7.
Select
1-point adjustment
, press
SELECT
. Press
OK
to continue.
