9.3 O2 analyser interference
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Codes - NOx Technical Code (2008) - Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines - Appendix 4 - Calibration of the analytical and measurement instruments - 9 Interference effects with CO, CO2, NOx and O2 analysers - 9.3 O2 analyser interference

9.3 O2 analyser interference

  9.3.1 Instrument response of a PMD analyser caused by gases other than oxygen is comparatively slight. The oxygen equivalents of the common exhaust gas constituents are shown in table 6.

Table 6 Oxygen equivalents

Gas O2 equivalent
%
Carbon dioxide (CO2) – 0.623
Carbon monoxide (CO) – 0.354
Nitric oxide (NO) + 44.4
Nitrogen dioxide (NO2) + 28.7
Water (H2O) – 0.381

  9.3.2 The observed oxygen concentration shall be corrected by the following formula:

  9.3.3 For ZRDO and ECS analysers, instrument interference caused by gases other than oxygen shall be compensated in accordance with the manufacturer’s recommendations and with good engineering practice. Electrochemical sensors shall be compensated for CO2 and NOx interference.

Parent topic: 9 Interference effects with CO, CO2, NOx and O2 analysers
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