8.3 O2 analyser interference

Clasification Society 2024 - Version 9.40

Statutory Documents - IMO Publications and Documents - International Codes - NOx Technical Code - Technical Code on Control of Emission of Nitrous Oxides from Marine Diesel Engines - Appendix 4 - Calibration of the analytical instruments - 8 Interference effects with CO, CO2, NOx and O2 analysers - 8.3 O2 analyser interference

8.3 O₂ analyser interference

8.3.1 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 5.

Table 5 Oxygen equivalents

100% gas concentration	Equivalent % O₂
Carbon dioxide, CO₂	- 0.623
Carbon monoxide, CO	- 0.354
Nitric oxide, NO	+ 44.4
Nitrogen dioxide, NO₂	+ 28.7
Water, H₂O	- 0.381

8.3.2 The observed oxygen concentration shall be corrected by the following formula if high-precision measurements are to be done:

(7)

8.3.3 For ZRDO and ECS analysers, instrument interference caused by gases other than oxygen shall be compensated for in accordance with the instrument supplier's instructions.

Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.