Vaisala HMP230 - Manual (Page 62)

HMP230 SERIES
User's Guide
M210225en-B
56
7.1.2.1. With serial 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 a measurement hole of the LiCl chamber in
the humidity calibrator.
• Wait at least 30 minutes.
• 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 humidity in the
calibrator, enter c <cr> instead of the first reference:
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 a measurement hole of the NaCl chamber.
• Wait at least 30 minutes.
• Press any key and 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>
instead of the reference value.
7.1.2.2. 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 30 minutes.
• 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 correspond the reference humidity and
press ENT; pressing an arrow once changes the reading by 0.05 %RH.