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Commission Regulation (EC) No 692/2008 of 18 July 2008 implementing and amending Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information (Text with EEA relevance)
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The oxygen interference check shall be performed when introducing an analyser into service and after major maintenance intervals. A measuring range shall be chosen in which the oxygen interference check gases fall in the upper 50 per cent. The test shall be conducted with the oven temperature set as required. The specifications of the oxygen interference check gases are described in point 5.3.
The following procedure applies:
The analyser shall be set at zero.
The analyser shall be spanned with a 0 per cent oxygen blend for positive ignition engines and a 21 per cent oxygen blend for compression ignition engines.
The zero response shall be rechecked. If it has changed by more than 0,5 per cent of full scale, steps (i) and (ii) shall be repeated.
The 5 per cent and 10 per cent oxygen interference check gases shall be introduced.
The zero response shall be rechecked. If it has changed by more than ± 1 per cent of full scale, the test shall be repeated.
The oxygen interference E O2 shall be calculated for each oxygen interference check gas in step (d) as follows:
where the analyser response is:
where:
is the reference HC concentration in step (b) [ppmC 1 ]
is the reference HC concentration in step (d) [ppmC 1 ]
is the full scale HC concentration in step (b) [ppmC 1 ]
is the full scale HC concentration in step (d) [ppmC 1 ]
is the measured HC concentration in step (b) [ppmC 1 ]
is the measured HC concentration in step (d) [ppmC 1 ].
The oxygen interference E O2 shall be less than ± 1,5 per cent for all required oxygen interference check gases.
If the oxygen interference E O2 is greater than ± 1,5 per cent, corrective action may be taken by incrementally adjusting the air flow (above and below the manufacturer's specifications), the fuel flow and the sample flow.
The oxygen interference check shall be repeated for each new setting.]
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