Vaisala HMP42 - Manual (Page 21)

HMI41 AND HMP42
M210317EN-A Operating Manual
17
Then press MODE twice, and the following appears:
RH
set
Press ENTER to activate the one point calibration mode. A message similar to
the following appears with the first line blinking:
RH
set
%
The blinking number indicates the humidity reference value in the HMI41
memory. Check the salt chamber temperature, read the closest humidity value
in the calibration table and adjust the display with buttons ▲ and ▼ to
correspond to the value given in the table. For example, if the temperature in
the calibrator's NaCl salt chamber is 20.5 °C, adjust the value to 75.5 %RH:
RH
set
%
Each time the button is pressed, the value changes with 0.1 %. If you keep the
button pressed, the value changes in a faster mode. Press ENTER and the
HMI41 indicator shows the value that the probe is currently measuring,
displaying a message similar to the following:
RH %
Wait at least ten minutes for the reading to stabilize and press ENTER to
acknowledge the value. Press ENTER again to conclude the one point
calibration. If the calibration has been successful, the following message
appears: