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And for the 0% calibration the following types can be selected:
Factory 0% Calibration
(refer to chapter 0)
0% Calibration
(refer to chapter 7.1.4)
Most calibration types have been explained already in the
preceding chapters (see references in the above list). Only the air
calibration type
Custom Calibration
is a unique feature only
available in the
Custom Mode
. The
Custom Calibration
offers the
most flexible options for performing an air calibration as explained
in the following.
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, 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.
Depending on the calibration standard used, select either
Water
(DO)
for dissolved oxygen or
Gas Phase
. In the latter case the % of
relative
Humidity
(%RH)
of the gas needs to be determined with a
hygrometer and entered. If the calibration is performed in the
