3 Analysers
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 3 - Specifications for analysers to be used in the determination of gaseous components of diesel engine emissions - 3 Analysers

3 Analysers

 The gases to be measured shall be analysed with the following instruments. For non-linear analysers, the use of linearising circuits is permitted.

  • .1 Carbon monoxide (CO) analysis

    The carbon monoxide analyser shall be of the Non-Dispersive InfraRed (NDIR) absorption type.

  • .2 Carbon dioxide (CO2) analysis

    The carbon dioxide analyser shall be of the Non-Dispersive InfraRed (NDIR) absorption type.

  • .3 Oxygen (O2) analysis

    Oxygen analysers shall be of the ParaMagnetic Detector (PMD), ZiRconium DiOxide (ZRDO) or ElectroChemical Sensor (ECS) type.

    Note Electrochemical sensors shall be compensated for CO2 and NOx interference.

  • .4 Oxides of nitrogen (NOx) analysis

    The oxides of nitrogen analyser shall be of the ChemiLuminescent Detector (CLD) or Heated ChemiLuminescent Detector (HCLD) type with a NO2/NO converter, if measured on a dry basis. If measured on a wet basis, an HCLD with converter maintained above 333 K (60°C) shall be used, provided the water quench check (see 8.2.2 of appendix 4 of this Code) is satisfied.

Parent topic: Appendix 3 - Specifications for analysers to be used in the determination of gaseous components of diesel engine emissions
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