Vaisala HUMICAP DMT132 Betriebsanweisung PDF herunterladen (Seite 63)

Chapter 5 ______________________________________________________________ Maintenance

VAISALA _______________________________________________________________________ 61

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

the current user adjustment parameters. Write down the Cp offset

and gain values so you can restore them manually using the

command, if necessary.

6. Use the

ERRS command to see that no errors are active:

>errs

7. Install the HMK15 calibrator fitting over the LiCl salt chamber of

the humidity calibrator (11 %RH). Make sure it sits tightly over the

salt chamber.

8. Insert the DMT132 into the chamber. Do not remove the filter.

Make sure all unused holes are plugged and the transmitter is

installed tightly on the thread.

9. Give the

CRH command. The output from the command shows the

currently measured RH value, and prompts you to enter the value

of the first reference (Ref1). This is the reference on the dry end,

which produces the offset correction for the measurement.

>crh

RH: 11.39800112 Ref1 ?

10. Wait for 20 ... 40 minutes for the reading to stabilize. Press ENTER

without typing anything to update the value shown by the

CRH

command.

RH: 11.39800112 Ref1 ?

RH: 11.38377201 Ref1 ?

RH: 11.37988329 Ref1 ?

11. When the measurement shown by

CRH is stable, you can either

apply the correction or exit the procedure:

- To apply the correction, press ENTER one last time to update

the value, type 11 and press ENTER again (assuming you are

using the HMK15 and the LiCl salt).

- To exit the

CRH command without adjusting the measurement,

press the ESC key and exit this procedure.

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Vaisala HUMICAP DMT132 Betriebsanweisung Seite 63