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

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CO2 quench check

1.9.2.1.  A CO2 span gas having a concentration of 80 to 100% of full scale of the maximum operating range shall be passed through the NDIR analyser and the CO2 value recorded as A. It shall then be diluted approximately 50% with NO span gas and passed through the NDIR and (H)CLD with the CO2 and NO values recorded as B and C, respectively. The CO2 shall be shut off and only the NO span gas be passed through the (H)CLD and the NO value recorded as D.

  • The quench shall be calculated as follows:

  • and must not be greater than 3% of full scale,

  • where:

    A:undiluted CO2 concentration measured with NDIR%
    B:diluted CO2 concentration measured with NDIR%
    C:diluted NO concentration measured with CLD ppm
    D:undiluted NO concentration measured with CLD ppm

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