Vaisala HMP260 User 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
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
RH : 1.90
Ref1 ?
11.3
Press any key when ready ...
RH : 76.30
Ref2 ?
74.9
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
RH : 1.90
Ref1 ?
11.3
FCRH 2
RH : 76.30
Ref2 ?
74.9
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
FCRH
RH : 12.00
Ref1 ? c
RH : 11.70
Ref1 ? c
RH : 11.50
Ref1 ? 11.3
Press any key when ready ...
RH : 76.00
Ref2 ? 75.5
CT
Temperature calibration
Disconnect the security lock jumper!
CT
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
T : 0.80 Ref1 ?
0.0
Press any key when ready ...
T : 56.20
Ref2 ?
55.0