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The oxygen level in the calibration standard can be freely chosen in
Oxygen (%O2)
. If the air calibration standard is based on ambient
air or air saturated water, then this value should be kept at
20.95%O2 (default), representing the standard oxygen volume
fraction in ambient air. However, other values can be adjusted if
custom calibration gases are used, of e.g. 5%O2, which might be
useful when using trace oxygen sensors.
The temperature of the calibration standard needs to be adjusted.
Either, a
Fixed Temperature
is adjusted manually, or the
temperature is read from the external temperature sensor (placed
close to the oxygen sensor) by selecting
External Temperature
Sensor
.
Also the actual atmospheric
pressure
in the calibration standard
can be entered manually in
Pressure (mbar)
. Normal conditions
refer to 1013 mbar (default setting).
If the actual atmospheric pressure cannot be determined on site, it
is alternatively possible to enter the actual
Elevation
in meters (m)
above sea level
. For this click on
Elevation
and enter the actual
elevation. Please note, that this option takes only the elevation-
dependent pressure change into account, but not the variations
