Vaisala HMP228 Guide de l'utilisateur télécharger pdf (Page 47)

Chapter 12 ________________________________ Calibration and adjustment of MM70 series probes

VAISALA _______________________________________________________________________ 45

1-point adjustment

Usually it is recommended to make an adjustment in two reference

humidities. If adjustment is done by using one reference humidity (1-point

adjustment), select the reference humidity so that it represents the

measuring environment. Make the adjustment in one point as instructed in

the previous section Two-point relative humidity adjustment (select 1-point

adjustment

and follow the display instructions).

Temperature adjustment

Temperature adjustment in one or two points can be done if there is reason

to believe that the adjustment is changed. If adjustment is done only in one

point, reference condition shall represent the measuring environment.

1. Take out the screw covering the calibration button (in the probe

handle).

2. Press the calibration button. For pressing, use tool with thin and

sharp point, such as small screwdriver. When pressing the button,

indicator turns to adjusting mode.

3. Select T, press SELECT.

4. Now the adjustment mode is on, press ADJUST to select the

adjustment method: 1-point adjustment or 2-point adjustment.

1-point adjustment

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

5. Select 1-point adjustment, press SELECT.

6. Set the probe to a reference temperature. You can follow the

stabilization from the GRAPH display. Press READY when the

reading is stabilized in the reference.

7. Give the reference temperature value by using the arrow buttons.

Press OK.

8. Confirm the adjustment, press YES. (By pressing NO you return

to adjustment mode display and no changes are made).

9. Calibration is carried out. Press BACK to exit the adjustment mode

and EXIT to return to the basic display.

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Vaisala HMP228 Guide de l'utilisateur Page 47