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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 Guida Utente Pagina 50