Vaisala HMP260 - Manual (Page 72)

HMP260 SERIES
HMP260-U017en-1.5 Appendix 1: Serial commands
FCRH Relative humidity calibration after sensor change
Disconnect the security lock jumper!
FCRH <cr>
After humidity sensor change the transmitter must be calibrated using this command and
the calibration must be done at two reference points. The calibration 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>
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>
With this command the transmitters can be calibrated against an accurate reference,
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>