Adjustment using a hand-held meter – Vaisala GMW90 User Manual
Page 69
Chapter 5 _______________________________________________________________ Maintenance
VAISALA ________________________________________________________________________ 67
Adjustment Using a Hand-Held Meter
GMW90 transmitters can be adjusted using Vaisala hand-held meters
HM70 (for humidity and temperature) and GM70 (for carbon dioxide and
temperature).
1.
Connect the GMW90 series transmitter to the MI70 indicator using
the connection cable (Vaisala order code 219980). MI70 indicator
is the hand-held display device that is included with HM70 and
GM70.
2.
Depending on the connected devices, you may be prompted to
check the currently applied environment settings. Check the
settings when prompted.
3.
In the Functions menu of the MI70 indicator, select Calibrate
XMW9x and press Start.
4.
Confirm Yes. Confirm the automatic power off notification with
Ok.
5.
Select parameter for adjustment: CO
2
, RH, or T.
6.
Screen shows the measured values and their difference. Press
Adjust to select the Adjustment mode.
7.
Select the desired adjustment type using arrow buttons and press
Select:
- To same as reference: Adjusts the measurement of the GMW90
transmitter to the same reading as the reference that is connected
to the other port of the MI70 indicator. This option is not
available if no reference for the selected parameter is connected
to the MI70 indicator.
- 1-point adjustment: Adjusts the measurement of the GMW90
to a reference value that you specify. Follow the instructions
from the MI70 indicator when using this option.
- 2-point adjustment: Adjusts the measurement of the GMW90
at two points to reference values that you specify. This option is
not available when adjusting temperature (T).
- Revert factory calib.: This option removes the currently
applied user adjustment from the measurement module (GM10
module for CO
2
, HTM10 module for RH or T). Only the
adjustment for the selected parameter is removed.
8.
Complete the selected adjustment by following the instructions
from the MI70 indicator.