Point adjustment by using a calibrator – Vaisala MM70 User Manual
Page 49
Chapter 5 ___________________________________________ CALIBRATION AND ADJUSTMENT
8.
Adjustment is done. To return to the basic display, first press the
BACK key, then the EXIT key.
9.
Detach the calibration cable.
2-point Adjustment by Using a
Calibrator
If you use humidity calibrator HMK15, use the adapter fitting (13.5
mm) on the measurement hole.
When using this adjustment method, start with the steps 1 through 4 in
the section Calibration and Adjustment of MMT318 Transmitters on
page 45. Then proceed as follows:
1.
Select the quantity and press the SELECT key.
2.
Remove the filter from the transmitter´s probe and insert the
probe head into the reference condition.
3.
To continue adjusting, press the ADJUST key.
4. Select
2-point adjustment, press the SELECT key.
5. Press
the
READY key when the reading is stabilized in the
reference condition (takes about 30 minutes or more).
6.
Enter correct reference value by using the arrow keys. Press the
OK key.
7.
Remove the probe and insert the probe head into the second
reference condition. You can follow the stabilization from the
graph display, by pressing the GRAPH key.
8. Press
the
READY key when the reading is stabilized in the
second reference condition.
9.
Enter the higher reference humidity value by using the arrow
keys. Press the OK key.
10. Confirm the adjustment by pressing the YES key. (By pressing
the NO key you will return to adjustment mode display and no
changes are made.) Note that if the difference between two
references is less than 50%, adjustment cannot be done.
11. Adjustment is done. To return to the basic display, first press the
BACK key, then the EXIT key.
12. Detach the calibration cable.
VAISALA _______________________________________________________________________ 47