Chapter 5.9.9 - Re-checking the analysers
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Statutory Documents - IMO Publications and Documents - Circulars - Marine Environment Protection Committee - MEPC.1/Circular.540 – Approved Unified Interpretations to MARPOL Annex VI and the NOx Technical Code – (24 November 2006) - Annex - Draft Unified Interpretations to MARPOL Annex VI and the NOx Technical Code and Related Implementation Issues - The NOx Technical Code - Chapter 5.9.9 - Re-checking the analysers

Chapter 5.9.9 - Re-checking the analysers

 Chapter 5.9.9 reads as follows:

 After the emission test, the calibration of the analysers shall be re-checked, using a zero gas and the same span gas as used prior to the measurements. The test shall be considered acceptable if the difference between the two calibration results is less than 2%.

 Interpretation:

 For application of this section the following interpretations shall be applied:

  • (a) The term “the calibration of the analysers shall be re-checked,” shall be interpreted as the zero and span response of the analysers shall be re-checked'.

  • (b) The term “if the difference between the two calibration results is less than 2%” shall be interpreted as 'if the difference between the two check results is less than 2%' where the 2% is understood to be 2% of the span gas concentration (and not analyser full scale), i.e.: Maximum permitted difference in span or zero check readings (ppm or % as appropriate):

  • = 0.02. Initial span gas concentration reading.

Parent topic: The NOx Technical Code
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