6.4 P4.0: Entering the absolute pressure (Wöhler FA 430 only).
When measuring at high altitudes, take the pressure into consideration to obtain a pre-
cise CO
2
reading. Before beginning to take measurements at high altitudes, enter the
absolute pressure of your location .
In the P4.0 mode, press the HOLD/MIN/MAX
key to access the Absolute pressure setting
mode.
The preset absolute pressure is displayed in hec-
topascal (1013 hPa).
Fig. 17: Entering the absolute pressure
Using the Up and Down keys, set the absolute
pressure of the location where you are taking
measurements.
To return to the P4.0 mode after completing
the setting, press the HOLD/MIN/MAX key.