Vaisala DMP248 Manuel de service télécharger pdf (Page 62)

OPERATING MANUAL_______________________________________________________________

56 _____________________________________________________________________ U263EN-1.4

NOTE

As relative humidity is a temperature dependent parameter, the probe

and the salt bath calibrator have to stabilize to the same temperature

for best accuracy.

Two-point calibration procedure

A two-point humidity calibration should be performed in stable

conditions using saturated salt solutions as references.

Using serial commands

• Leave the calibrator and the transmitter for at least 4 hours in the

same space so that their temperatures have time to equalize.

Remove the filter cap on the transmitter.

Disconnect the security lock jumper

before turning the transmitter on!

• Place the sensor head in the calibration hole of the LiCl bottle (dry

end reference) in the humidity calibrator.

• Wait for 10 minutes.

• Give command CRH <cr>, enter the first point value and press

<cr>.

>CRH <cr>

RH : xx.x Ref1 ? yy.y <cr>

Press any key when ready...

• If you want to see how the sensor stabilizes to the humidity in the

calibrator, enter c <cr> instead of the first reference:

RH : 11.9 Ref1 ? c <cr>

RH : 11.5 Ref1 ? c <cr>

RH : 11.5 Ref1 ? 11.3 <cr>

Press any key when ready...

• Place the sensor head in the calibration hole of the NaCl bottle

(wet end reference) in the humidity calibrator.

• Wait for 10 minutes.

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Vaisala DMP248 Manuel de service Page 62