Using a calibrator – Vaisala MM70 User Manual
Page 46
USER'S GUIDE____________________________________________________________________
4.
Wait until the reading is stabilized (takes about 30 minutes).
You can follow the stabilization from the graph display, by
pressing the GRAPH key.
5. Press
the
READY key when the value is stabilized in the
reference humidity.
6.
Enter the correct humidity value by using the arrow keys. Press
the OK key.
7. Confirm
by
pressing
the
YES key.
8.
To return to the basic display, first press the BACK key, then
the EXIT key twice.
2-point Relative Humidity
Adjustment by Using a Calibrator
You can use Vaisala humidity calibrator HMK15 in calibration and
adjustment. Note that the difference between the two reference
humidities should be at least 50%. MI70 indicator is working as a
communicator in the calibration procedure. When using this
adjustment method, start with the steps 1 through 12 in the section
Calibration and Adjustment of HMP228 Series Transmitters on page
42. Then proceed as follows:
1.
Insert the transmitter probe to the first reference humidity.
2. Press
the
ADJUST key.
3.
Select 2-point adjustment. Press the SELECT key.
4.
Wait until the reading is stabilized (takes about 30 minutes).
You can follow the stabilization from the graph display, by
pressing the GRAPH key.
5. Press
the
READY key when the value is stabilized in the first
reference humidity.
6.
Enter the first referenc humidity value by using the arrow keys.
Press the OK key.
7.
Insert the transmitter probe to the second reference humidity.
8.
Wait until the reading is stabilized (takes about 30 minutes or
more). You can follow the stabilization from the graph display,
by pressing the GRAPH key.
9. Press
the
READY key when the value is stabilized in the second
reference humidity.
44 __________________________________________________________________ M210498EN-C