Vaisala HUMICAP HMP155, User Manual, Page: 75 / 102

2. Open a terminal program.
3. Carry out chemical purge, if available.
See Chemical purge option (page 14) .
4. Press the ADJ button.
The green LED lights up.
5. Remove the filter from the probe and insert the probe into a measurement hole of the dry
end reference chamber (for example, LiCl: 11 % RH).
6. Type the FCRH command and press ENTER .
7. Wait at least 30 minutes for the sensor to stabilize.
8. Press ENTER a few times to check if the reading has stabilized.
9. When the reading has stabilized, give the reference humidity after the question mark and
press ENTER .
>fcrh
RH : 25.19 Ref1 ? 11.3
Press any key when ready ...
RH : 70.02 Ref2 ? 75.5
OK
>
The device is waiting for the high end reference.
10. Insert the probe into the measurement hole of the high end reference chamber (for
example, NaCl: 75 % RH chamber in the humidity calibrator HMK15) and press any key.
11. Let the probe stabilize for about 30 minutes. You can follow the stabilization by pressing
ENTER .
12. When stabilized, type the high end reference value after the question mark and press
ENTER .
RH : 75.45 Ref2 ?
RH : 75.57 Ref2 ?
RH : 75.55 Ref2 ?
RH : 75.59 Ref2 ? 75.5
OK
OK
indicates that the adjustment has succeeded and the new calibration coefficients are
calculated and stored.
13. Type the calibration information, date and text, to the memory of the probe.
See the commands CTEXT and CDATE .
6.4 User adjustment commands
You can use the
L
and
LI
commands to display adjustment parameters. You can use the
L
command in normal mode but you can only use the
LI
command in the adjustment mode.
Chapter 6 – Calibration and adjustment
73