Vaisala HMP240 - Manual (Page 48)

HMP240
User's Guide
M210300en
46
• Insert the sensor head into the measurement hole of the
LiCl chamber.
• Wait at least 10 minutes for the reading to stabilize.
• Give command CRH <cr>, enter the first point value and
press <cr>.
>CRH <cr>
RH : xx.x Ref1 ? yy.y <cr>
Press any key when ready...
• If you want to see how the sensor stabilizes to the humid-
ity in the calibrator, enter c <cr>:
RH : 11.9 Ref1 ? c <cr>
RH : 11.5 Ref1 ? c <cr>
RH : 11.5 Ref1 ? 11.3 <cr>
Press any key when ready...
• Insert the sensor head into the measurement hole of the
NaCl chamber.
• Wait at least 20 minutes for the reading to stabilize.
• Press any key, enter the second point value and press
<cr>.
RH : xx.x Ref2 ? yy.y <cr>
• The stabilization of the sensor can be monitored by
entering c<cr>.
6.1.2.2 With display / keypad commands
• Leave the calibrator and the transmitter for at least 4 hours
in the same space so that their temperatures have time to
equalize. Remove the filter cap on the transmitter.
Disconnect the security lock jumper!
• Insert the sensor head into the measurement hole of the
LiCl chamber.
• Wait at least 20 minutes for the reading to stabilize.
• Select Cali in the main menu and then RH cal; select Not
changed and then two-point calibration RH 2 point cal.
Change the first point reading with the arrow keys to cor-
respond to the reference humidity and press ENT; pressing
an arrow once changes the reading by 0.05 %RH.