Vaisala HMP228 Manuel d'utilisateur télécharger pdf (Page 55)

HMP228 Transmitters

M210282en-A Appendix 1: Serial commands

CALIBRATION COMMANDS

CRH Relative humidity calibration

Disconnect the security lock jumper!

CRH <cr>

With this command the transmitters can be calibrated against a reference. A

one-point calibration can be done against an accurate transfer standard in the

field and a two-point calibration using saturated salt solutions in controlled

conditions. A two-point calibration is performed as follows:

>CRH <cr>

RH : 12.00 Ref1 ? 11.3 <cr>

Press any key when ready ...

RH : 76.00 Ref2 ? 75.5 <cr>

In one-point offset correction, the Ref2 prompt is acknowledged with <cr>:

>CRH <cr>

RH : 12.80 Ref1 ? 11.3 <cr>

Press any key when ready ...

RH : 75.50 Ref2 ? <cr>

If the stabilization of the sensor to the humidity in the calibrator needs to be

monitored, the measurement output can be repeated by giving command c<cr>

at Ref1 and Ref2:

>CRH <cr>

RH : 12.00 Ref1 ? c <cr>

RH : 11.70 Ref1 ? c <cr>

RH : 11.50 Ref1 ? 11.3 <cr>

Press any key when ready ...

RH : 76.00 Ref2 ? 75.5 <cr>

FCRH Relative humidity calibration after sensor change

Disconnect the security lock jumper!

FCRH <cr>

After moisture sensor change the transmitter must be calibrated using this

command and the calibration must be done at two reference points. The cali-

bration is performed as follows:

>FCRH <cr>

RH : 1.90 Ref1 ? 11.3 <cr>

Press any key when ready ...

RH : 76.30 Ref2 ? 74.9 <cr>

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Vaisala HMP228 Manuel d'utilisateur Page 55