Vaisala HMP60 Guide de l'utilisateur télécharger pdf (Page 52)

User's Guide ______________________________________________________________________

50 __________________________________________________________________ M211060EN-C

7. When your serial connection is working, use the L command to see

the current user adjustment parameters.

8. Use the ERRS command to see that no errors are active:

errs

9. Give the CRH command, with the %RH value of the reference as a

parameter (in this case 11 for LiCl):

crh 11

10. Check with the L command that the user adjustment parameters

have changed.

If you wish to remove the effects of RH calibration (returning the

RH measurement of the HMP110 to the factory calibrated state),

see section Clear Adjustment of RH Measurement on page 41.

Two-Point Adjustment of RH

Measurement (HMP110)

To perform a two-point adjustment to the capacitance measurement of

the HMP110 you need:

- The Vaisala USB cable (Vaisala order code: 219690)

- PC with a terminal application.

- Two humidity references. The first point requires a < 50 %RH

humidity reference, the second point must be > 50 %RH. There must

also be at least 30 percentage point difference between the references.

The procedure below uses the HMK15 Humidity Calibrator. LiCl salt

(11 %RH) is used as the first reference point, NaCl (75 %RH) as the

second.

1. Connect the USB cable to the PC, but do not connect it to the probe

yet.

2. Insert the probe in the LiCl salt chamber of the humidity calibrator

(11 %RH).

3. Start a terminal application and set the correct connection settings.

The default serial settings are 19200 8 N 1. Remember to check

which COM port the USB cable is using.

4. Wait for 20 – 40 minutes for the humidity to stabilize.

5. Start the terminal session and connect the USB cable to the probe.

If your probe is in the analog output mode, you need to press Enter

a few times to start it in RS-485 mode.

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Vaisala HMP60 Guide de l'utilisateur Page 52