Dilution factor

Dilution factor

A ratio of diluting neutral gas to odourous sample gas.  According to ASTM E679, this is a ratio of diluting gas to the odour sample.  According to the EN13725, this is a ratio of the sum of the diluting gas and odour sample, to the odour sample.  It is calculated based on the flow rate.

Example:  5 parts of diluting air to 1 part of sample

ASTM E679:  Diluting gas/odourous sample = 5:1 = 5

EN 13725:  (diluting gas + odourous sample)/odourous sample = 6:1 = 6

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