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64
8014084/ZWT7/V3-1/2020-06 | SICK
O P E R A T I N G I N S T R U C T I O N S | TRANSIC111LP
Subject to change without notice
5
SETTING AMBIENT PARAMETERS
The first effect is the dilution of the oxygen concentration of the measured gas (water
displaces oxygen so there is a lower oxygen concentration in the measured gas). This is not
compensated during measurement. Only the second effect is due to the measuring
principle and can be compensated.
The dependency due to the measuring principle is shown in the 4th column of
convert temperature and relative humidity to absolute humidity”, page 63
. This is
compensated and eliminated when the water content of the measured gas is entered into
the measuring device storage.
The 5th column of
“Table to convert temperature and relative humidity to absolute humid-
shows the dilution effect. This effect is much stronger than the measuring
principle effect. This is also valid for the water content compensation because it is the
actual decrease of oxygen content in the measured gas due to water displacing oxygen in
the gas mixture.
Setting the water content for compensation
●
Syntax for input via the serial interface,
see “Set water content for compensation (com-
.
●
Setting via the user interface,
see “Humidity in process gas setting”, page 37
0511-086
Setting the CO
2
concentration in background gas
The effect of CO
2
on the measured O
2
value is so small that in most circumstances CO
2
compensation is not necessary. The CO
2
dependency is expressed in terms of relative CO
2
concentration (percent per volume CO
2
).
Setting the carbon dioxide content for compensation
●
Syntax for input via the serial interface,
see “Set carbon dioxide content for compensa-
.
●
Setting via the user interface,
see “CO2 sample gas setting”, page 38
.
Influence of further background gases
●
For further information on the influence of further background gases on oxygen
measurement,
see “Influence of background gases on oxygen measurement”,
.
NOTICE:
The gas pressure value must be specified for CO
2
compensation.