2.1 Analysers
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 8 – Implementation of the direct measurement and monitoring method(Refer to 6.4 of the NOx Technical Code 2008) - 2 Analysing equipment - 2.1 Analysers

2.1 Analysers

  2.1.1 The exhaust gases shall be analysed with the following instruments. For non-linear analysers, the use of linearizing circuits is permitted. Other systems or analysers may be accepted, subject to the approval of the Administration, provided they yield equivalent results to that of the equipment referenced below:

  • .1 Nitrogen oxides (NOx) analysis

  • The nitrogen oxides analyser shall be of the chemiluminescent detector (CLD) or heated chemiluminescent detector (HCLD) type. The exhaust gas sampled for NOx measurement shall be maintained above its dewpoint temperature until it has passed through the NO2 to NO converter.

  • Note: In the case of raw exhaust gas this temperature shall be greater than 60°C if the engine is fuelled with ISO 8217: 2005 DM-grade type fuel and greater than 140°C if fuelled with ISO 8217: 2005 RM-grade type fuel.

  • .2 Carbon dioxide (CO2) analysis

  • When required, the carbon dioxide analyser shall be of the non-dispersive infrared (NDIR) absorption type.

  • .3 Carbon monoxide (CO) analysis

  • When required, the carbon monoxide analyser shall be of the non-dispersive infrared (NDIR) absorption type.

  • .4 Hydrocarbon (HC) analysis

  • When required, the hydrocarbon analyser shall be of the heated flame ionization detector (HFID) type. The exhaust gas sampled for HC measurement shall be maintained at 190°C ±10°C from the sample point to the detector. Optionally, for gas-fuelled engines (without liquid pilot injection), the hydrocarbon analyser may be of the non-heated flame ionization detector (FID) type.

  • .5 Oxygen (O2) analysis

  • When required, the oxygen analyser shall be of the paramagnetic detector (PMD), zirconium dioxide (ZRDO) or electrochemical sensor (ECS) type. ZRDO shall not be used for dual fuel or gas-fuelled engines.

Parent topic: 2 Analysing equipment
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