Vaisala HUMICAP MM70 Guide de l'utilisateur télécharger pdf (Page 52)

USER'S GUIDE____________________________________________________________________

have to feed the reference values, the MM70 displays the accurate

value based on the measured temperature and the Greenspan table

stored into the memory of the MM70. Make the adjustment as

instructed in the section below (select LiCl-NaCl autom. on item 8

and follow the display instructions).

2-point Adjustment

Low humidity references 0 % (Nitrogen)/ 11.3 % (LiCl) and higher

humidity references 75 % (NaCl)/ 97 % (K2SO4) are recommended

for two-point adjustment. Ensure that the difference between the

humidity references is more than 50 %.

1. When adjusting both relative humidity and temperature, please

make the temperature adjustment first.

2. Check that the MM70 is switched on.

3. Take out the screw from the probe handle to expose the

calibration button. Press the button with a small screwdriver.

When pressing the button, indicator turns to adjusting mode.

4. Press the OK key to start the adjustment mode.

5. Select RH, press the SELECT key.

6. To check the environmental settings, press the YES key. To

continue directly to adjustment mode, press the NO key.

7. Now the adjustment mode is on, press the ADJUST key to

select the adjustment method.

8. Select 2-point adjustment, press the SELECT key. Press the

OK key to continue.

9. Set the probe to a lower reference relative humidity. If using

HMK15 calibrator, use the adapter fitting (13.5 mm hole).

10. You can follow the stabilization from the graph display, by

pressing the GRAPH key. When the reading is stabilized, press

the READY key.

11. Enter value for the lower reference humidity by using the arrow

keys. Press the OK key.

12. Set the probe to the higher reference humidity. You can follow

the stabilization from the graph display, by pressing the

GRAPH key. When the reading is stabilized, press the READY

key.

13. Enter value for the higher reference humidity by using the arrow

keys. Press the OK key.

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Vaisala HUMICAP MM70 Guide de l'utilisateur Page 52