Vaisala HMP228 Guide de l'utilisateur télécharger pdf (Page 39)

Chapter 10 _______________________________________Calibration and adjustment of transmitters

VAISALA _______________________________________________________________________ 37

16. Wait until the reading is stabilized (takes about 30 minutes). You can

follow the stabilization from the GRAPH display.

17. Press READY when the value is stabilized in the reference

humidity.

18. Enter the correct humidity value by using the arrow buttons. Press

OK.

19. Confirm by pressing YES

20. Press BACK, EXIT, EXIT to return to the basic display.

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

shall be at least 50 %. MI70 indicator is working as a communicator in the

calibration procedure.

Follow the steps from 1 to 12 and continue as follows:

13. Insert the transmitter probe to the first reference humidity.

14. Press ADJUST

15. Select 2-point adjustment. press SELECT

16. Wait until the reading is stabilized (takes about 30 minutes). You can

follow the stabilization from the GRAPH display.

17. Press READY when the value is stabilized in the first reference

humidity.

18. Enter the first reference humidity value by using the arrow buttons.

Press OK.

19. Insert the transmitter probe to the second reference humidity.

20. Wait until the reading is stabilized (takes about 30 minutes or more).

You can follow the stabilization from the GRAPH display.

21. Press READY when the value is stabilized in the second reference

humidity.

22. Enter the second reference humidity value by using the arrow

buttons. Press OK.

23. Confirm by pressing YES

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Vaisala HMP228 Guide de l'utilisateur Page 39