Vaisala HMP228 - Manual (Page 56)

HMP228 Transmitters
Appendix 1: Serial commands
M210282en-A
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The command can also be divided into two commands, so the computer can be
used for other purposes while waiting for the sensor to stabilize to the higher
humidity.
>FCRH 1 <cr>
RH : 1.90
Ref1 ? 11.3 <cr>
FCRH 2 <cr> ...
RH : 76.30
Ref2 ? 74.9 <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:
>FCRH <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>
CT Temperature calibration
Disconnect the security lock jumper!
CT <cr>
Using this command the transmitters can be calibrated against an accurate ref-
erence, such as a Pt 100 simulator. A two-point calibration is performed as
follows:
>CT <cr>
T : 0.80
Ref1 ? 0.0 <cr>
Press any key when ready ...
T : 56.20
Ref2 ? 55.0 <cr>
In one-point offset correction, the Ref2 prompt is acknowledged with <cr>:
>CT <cr>
T : 0.80
Ref1 ? 0.0 <cr>
Press any key when ready ...
T : 75.50
Ref2 ? <cr>
If the stabilization of the sensor to the temperature of the calibrator or the ref-
erence needs to be monitored, the measurement output can be repeated by giv-
ing command c<cr> at Ref1 and Ref2:
>CT <cr>
T : 0.80
Ref1 ? c <cr>
T : 0.40 Ref1 ? 0.00 <cr>
Press any key when ready ...
T : 56.20
Ref2 ? 55.0 <cr>