One-point adjustment using a calibrator, Field checking and adjustment using a calibrated, Reference probe – Vaisala HMT120 User Manual
Page 57
Chapter 5 _______________________________________________________________ Maintenance
VAISALA ________________________________________________________________________ 55
NOTE
From this point onward, the local adjustment buttons at HMT120 are
disabled and adjustment is carried out using the MI70 indicator.
HMT120 display and analog outputs will always follow the actual
measured RH/T value when in MI70 adjustment mode. When operating
the MI70, do not press the buttons too quickly or the calibration may
fail. Wait for one second between each press.
6.
Press OK to start adjustment.
7.
Check the environment settings if needed. Otherwise, press
NO
.
Select
RH
or
T adjustment
. Continue according to the directions of the
desired adjustment method.
Field Checking and Adjustment Using a Calibrated
Reference Probe
Follow steps 1 to 7 on page 54 and continue as follows:
8.
Check that the probes are located in equal conditions and wait
until the readings have stabilized. This may take 30 minutes or
more. If you are close to the probes, do not breath in their
direction.
9.
Press
ADJUST
to continue adjusting.
10. Choose
To same as RH
I/II
from the MI70 adjustment menu, press
SELECT
(MI70 automatically recognizes which port the HMP70
series probe is connected to).
11. Confirm the adjustment by pressing
YES
.
12. The adjustment is done. Press
BACK
and
EXIT
to return to the
basic display.
13. Turn off the MI70 and detach the connection cable.
One-Point Adjustment Using a Calibrator
When adjusting the transmitter in only one reference condition, please
take care that the reference condition represents the measuring
environment. 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 54 and continue as follows:
8.
Remove the filter from the transmitter's probe and insert the
probe head into the reference condition.
9.
Press
ADJUST
to continue adjusting.
10. Choose
1-point adjustment
from the MI70 adjustment menu and
press
SELECT
.