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Dilution Factor
Overview
A ratio of diluting neutral gas to odorous sample gas. According to ASTM E679, this is a ratio of diluting gas to the odour sample. According to 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