Vaisala HUMICAP HMP155 Betriebsanweisung PDF herunterladen (Seite 63)

Chapter 6 ___________________________________________________Calibration and Adjustment

VAISALA _______________________________________________________________________ 61

One-Point Humidity and Temperature

Adjustment

To make a one-point humidity or temperature adjustment:

1. Carry out the chemical purge (if available). See section Chemical

Purge (Optional) on page 45.

2. Uncover the adjustme

nt buttons on the probe by removing the

protective cover and removing the calibration seal.

3. Open the protective plug and you can see three buttons marked

-, □

and

+. There is also a two-colored indicator LED. See Figure 13 on

page 58.

4. Remove the filter and insert the probe into a measurement hole of

the salt chamber to do the humidity adjustment.

5. Press the

ADJ button and hold it down until the green indicator

LED lights up. This puts HMP155 in RH calibration mode.

NOTE

Do not touch the adjustment buttons before the conditions have

stabilized.

6. Using the

- and + buttons, make sure the A

out

voltage is correct and

press the

ADJ button. Green indicator LED turns off and back on.

7. To move on to the temperature adjustment, press the

ADJ button

once and the red indicator LED lights up.

8. Insert the probe into the reference temperature.

NOTE

Do not touch the adjustment buttons before the conditions have

stabilized.

9. Using the

- and + buttons, make the temperature offset adjustment

by making sure the A

out

voltage is correct and press the

ADJ button. Red indicator LED turns off and back on.

10. Press the

ADJ button one more time so that the red LED turns off

to indicate the probe has quit the calibration mode.

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