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Division 3.3.2 Calculation of PM using the double dilution method

Original text. Later amendments are not shown.

Vep=Vset− Vssd

where:

Vep

  • is the volume of diluted exhaust gas flowing through the particulate sample filter under standard conditions;

    • Vset

  • is the volume of the double diluted exhaust gas passing through the particulate sampling filters under standard conditions;

    • Vssd

  • is the volume of the secondary dilution air under standard conditions.

    • Where the secondary diluted sample gas for PM measurement is not returned to the tunnel, the CVS volume shall be calculated as in single dilution, i.e.:

    Vmix=Vmix indicated+ Vep

    where:

    Vmix indicated

  • is the measured volume of diluted exhaust gas in the dilution system following extraction of the particulate sample under standard conditions.