Vaisala HMP46 - Manual (Page 18)

HMI41 AND PROBES
Operating Manual
M210316EN-A
14
Press ENTER to activate the two point humidity calibration mode. A message
similar to the following appears with the first line blinking:
RH
set
%
Lo
The blinking number indicates the value of the lower humidity reference
stored 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 of the LiCl salt chamber is 22 °C, adjust the value to
11.3 %RH:
RH
set
%
Lo
Press ENTER, and the HMI41 shows the value that the probe is currently
measuring, displaying a message similar to the following:
RH %
Lo
Wait at least ten minutes for the reading to stabilize and press ENTER to
acknowledge the value. Press ENTER again to conclude the lower point
calibration. A message similar to the following appears with the first line
blinking:
RH
set
%
Hi
The blinking number indicates the value of the higher humidity reference
stored in the HMI41 memory. Insert the probe to the higher reference
humidity. 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: