Sch 1F para 5
Any percentage of air or gas not easily detectable in the liquid shall not lead to a variation of error greater than: — 0.5 % for liquids other than potable liquids and for liquids of a viscosity not exceeding 1 mPa.s, or — 1 % for potable liquids and for liquids of a viscosity exceeding 1 mPa.s. However, the allowed variation shall never be smaller than 1 % of MMQ. This value applies in the case of air or gas pockets.