Vaisala MMT310 - Manual (Page 63)

Chapter 6 ____________________________________________________ Calibration and adjustment
VAISALA ________________________________________________________________________ 63
Use the arrow buttons to highlight RH or T and press SELECT to choose
the parameter for adjustment.
For RH adjustment instructions, see section Adjusting RH with MI70.
For T adjustment instructions, see section Adjusting T with MI70.
Adjusting RH with MI70
Selecting RH in the main adjustment menu brings up a notification about
checking environment settings. Select YES to access the environment
settings before performing the RH adjustment, or NO to continue to RH
adjustment without changing the current environment settings. Select
ADJUST to access the RH adjustment options.
The following RH adjustment options are available:
- 1-point adjustment
- 2-point adjustment
- LiCl – NaCl auto
1-point RH Adjustment
Usually it is recommended to make an adjustment in two reference
humidities. If the adjustment is done by using only one reference
humidity (1-point adjustment), select the reference humidity so that it
represents the measuring environment. Make the adjustment in one point
as instructed in the 2-point RH Adjustment section on page 63 (select 1-
point adjustment instead of 2-point adjustment and follow the display
instructions).
2-point RH Adjustment
Select 2-point adjustment in the RH adjustment menu and follow the
steps below:
1. Set the probe to a lower reference relative humidity. You can
follow the stabilization from the GRAPH display. Press READY
when the reading is stabilized.
2. Enter the lower reference humidity value by using the arrow
buttons. Press OK .
3. Set the probe to the higher reference humidity. Press READY
when the reading is stabilized. You can follow the stabilization
from the GRAPH display.
4. Enter the higher reference relative humidity value by using the
arrow buttons. Press OK .