Vaisala HUMICAP HMP41 Podręcznik Użytkownika Pobierz pdf (Strona 67)

Chapter 5 ______________________________________________________________ Maintenance

VAISALA _______________________________________________________________________ 65

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 62 and continue as follows:

8. Remove the filter from the transmitter's probe and insert the

probe head into the lower humidity reference condition.

9. Press ADJUST to continue adjusting.

10. Choose 2-point adjustment from the MI70 adjustment menu and

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 condition and insert

the probe head 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 cannot 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.

LiCl-NaCl Adjustment

This adjustment is done using relative humidity references 11.3 % RH

(LiCl) and 75.5 % RH (NaCl).

Follow steps 1 to 7 on page 62 and continue as follows:

8. Remove the filter from the transmitter's probe and insert the

probe head into the LiCl salt chamber.

9. Press ADJUST to continue adjusting.

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Vaisala HUMICAP HMP41 Podręcznik Użytkownika Strona 67