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The Non-Road Mobile Machinery (Emission of Gaseous and Particulate Pollutants) Regulations 1999

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Test sequence

3.6.3  The test sequence shall be started. The test shall be performed in the order of the mode numbers as set out above for the test cycle.

  • During each mode of the test cycle after the initial transition period, the specified speed shall be held to within ± 1% of rated speed or ± 3 min−1 whichever is greater except for low idle which shall be within the tolerances declared by the manufacturer. The specified torque shall be held so that the average over the period during which the measurements are being taken is within ± 2% of the maximum torque at the test speed.

  • For each measuring point a minimum time of 10 minutes is necessary. If for the testing of an engine, longer sampling times are required for reasons of obtaining sufficient particulate mass on the measuring filter the test mode period can be extended as necessary.

  • The mode length shall be recorded and reported.

  • The gaseous exhaust emission concentration values shall be measured and recorded during the last three minutes of the mode.

  • The particulate sampling and the gaseous emission measurement should not commence before engine stablization, as defined by the manufacturer, has been achieved and their completion must be coincident.

  • The fuel temperature shall be measured at the inlet to the fuel injection pump or as specified by the manufacturer, and the location of measurement recorded.

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