Vaisala HMP243 Guide de l'utilisateur télécharger pdf (Page 50)

HMP240

User's Guide M210300en

6.1.3 Humidity calibration procedure after sensor change

Humidity calibration should be performed in stable conditions using saturated

salt solutions as a reference. If the transmitter has the re-gaining option, the

re-gaining has to be done manually before starting the calibration.

6.1.3.1 With 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 sensor head.

Disconnect the security lock jumper!

• Insert the sensor head into the measurement hole of the

LiCl chamber.

• Wait at least 20 minutes for the reading to stabilize.

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

press <cr>:

>FCRH <cr>

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

Press any key when ready...

• The stabilization of the sensor to the reference humidity

can be monitored by entering c <cr>:

RH : 11.9 Ref1 ? c <cr>

RH : 11.5 Ref1 ? c <cr>

RH : 11.5 Ref1 ? 11.3 <cr>

Press any key when ready...

• Insert the sensor head into the measurement hole of the

NaCl chamber.

• Wait at least 20 minutes for the reading to stabilize.

• Press any key, enter the second point value and press <cr>.

RH : xx.x Ref2 ? yy.y <cr>

• The stabilization of the sensor can be monitored by

entering c <cr>.

6.1.3.2 With display / keypad 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 sensor head.

Disconnect the security lock jumper!

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Vaisala HMP243 Guide de l'utilisateur Page 50