3.1.3.
The critical change value is the smaller of the two following values: the quantity corresponding to half of the magnitude of the MPE in the upper zone on the measured volume; the quantity corresponding to the MPE on the quantity corresponding to one minute at maximum flowrate.
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Source: EUR-Lex (Cellar) · retrieved 2026-11-06 · Text as adopted (Official Journal); later amendments are not incorporated in this text.