Vaisala HMP228 User's Guide download pdf (Page 41)

Chapter 10 _______________________________________Calibration and adjustment of transmitters

VAISALA _______________________________________________________________________ 39

6. Check that the probes are located in equal conditions and wait until

the readings are stabilized (can take 30 minutes or more). If you are

near the probes, do not breathe towards them.

7. Press ADJUST to continue adjusting.

8. Press To same as.., press SELECT. (MI70 recognizes always the port

to which the MMP70-series probe is connected).

9. Confirm by pressing

YES.

10. Adjustment is done. Press BACK and EXIT to return to the basic

display.

11. Switch off the MI70 and detach the calibration cable.

1-point adjustment by using a

calibrator

When adjusting a transmitter only in one reference condition, please take

care that the reference condition represents well the measuring

environment.

If you use humidity calibrator HMK15, please use the adapter fitting (13.5

mm) on the measurement hole.

Follow the steps from 1 to 4 and continue as follows:

5. Select the quantity press SELECT.

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

head into the reference condition.

7. Press

ADJUST to continue adjusting.

8. Select 1-point adjustment, press SELECT.

9. Press READY when the reading is stabilized in the reference

condition (takes about 30 minutes or more)

. You can follow the

stabilization from the GRAPH display.

10. Enter correct reference value by using the arrow buttons. Press OK.

11. Confirm by pressing YES.

12. Adjustment is done. Press BACK and EXIT to return to the basic

display.

13. Detach the calibration cable.

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Vaisala HMP228 User's Guide Page 41