ABB AO2000 Series - Magnos27: Substitute Gas Calibration

260 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Magnos27: Substitute gas calibration
Example
Substitute gas calibration of the Magnos27 analyzer module is described
using the example of "Oxygen measurement in flue gas".
Oxygen measurement in flue gas
The sample gas composition is known in the case of oxygen measurements.
Test gases
Zero gas: 16 vol.% CO
2
in N
2
Span gas: 10 vol.% of O
2
and 8.3 vol.% of CO
2
in N
2
Calibration with substitute gas
Since these test gases are not available everywhere, the analyzer module is
factory-set for calibration with a substitute gas.
In this case an additional measurement range is calibrated for 0 to 25 vol.%
of O
2
in N
2
(N
2
and O
2
/N
2
mixtures are available practically everywhere).
Measuring ranges
Component 1 O
2
in flue gas Meas. range 1 0 to 5 vol.%
Meas. range 2 0 to 10 vol.%
Component 2 O
2
in N
2
(substitute gas) Meas. range 1 0 to 25 vol.%
Calibration parameters
Calibration method Substitute gas calibration
Zero component Component 2 Meas. range 1
Span component Component 2 Meas. range 1
Calibration
• Calibrate zero with N
2
(component 2).
• Calibrate span with dried air (contains 20.96 vol.% of O
2
) or with an
O
2
/N
2
mixture.
Other measurement tasks
For other measurement tasks select the test gases and measurement ranges
in a similar manner according to the sample gas composition.