Vaisala HM70 - Manual (Page 46)

User's Guide ______________________________________________________________________
44 __________________________________________________________________ M210297EN-E
Two-Point Adjustment Using a
Calibrator
Note that the difference between the two reference humidities must be
at least 50 %. 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 42 and continue as follows:
8. Remove the filter from the transmitter's probe and insert the
probe into the lower humidity reference condition.
9. Press ADJUST to continue adjusting.
10. Choose 2-point adjustment from the MI70 adjustment menu,
press SELECT .
11. Press READY when the reading has stabilized in the first reference
condition (may take 30 minutes or more). You can follow the
stabilization from the
GRAPH display.
12. Enter the correct reference value in the first condition with the
arrow buttons. Press OK .
13. Remove the probe from the first reference conditions and insert
the probe into the higher humidity reference condition.
14. Press READY when the reading has stabilized in the second
reference condition (may take 30 minutes or more). You can
follow the stabilization from the
GRAPH display.
15. Enter the correct reference value in the second condition with
the arrow buttons. Press OK .
16. Confirm the adjustment by pressing YES (by pressing NO you
return to adjustment mode display and no changes are made). If
the difference between the two reference conditions is less than
50 %RH, adjustment can not be done.
17. The adjustment is done. Press BACK and EXIT to return to the
basic display.
18. Turn off the MI70 and detach the connection cable.