1.3 Pure and calibration gases
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Statutory Documents - IMO Publications and Documents - Resolutions - Marine Environment Protection Committee - Resolution MEPC.103(49) - Guidelines for On-Board NOx Verification Procedure - Direct Measurement and Monitoring Method - (adopted on 18 July 2003) - Annex - Guidelines for On-Board NOx Verification Procedure - Direct Measurement and Monitoring Method - 1 Analysing Equipment - 1.3 Pure and calibration gases

1.3 Pure and calibration gases

  1.3.1 Pure and calibration gases, as required, should comply with the NOx Technical Code, appendix 4, paragraphs 2.1 and 2.2. Declared concentrations should be traceable to national and/or international standards. Calibration gases should be in accordance with the analysing equipment manufacturer's recommendations.

  1.3.2 Analyser span gases should be between 80%-100% of the analyser scale being spanned.

Note Under certain conditions, only a span gas for the NOx analyser could be necessary for calibration of the analytical instruments. A NO span gas for a NOx analyser can be applied as a zero gas for an O2 or CO2 analyser if that span gas is balanced only with nitrogen. Ambient air may be applied both as a span gas for an O2 analyser (i.e. 20.9% O2) and as a zero gas for a NOx analyser, provided that the ambient air is uncontaminated by exhaust gas.

Parent topic: 1 Analysing Equipment
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