inconsistent Beer Gas mixes

[Draftguy]

I have a local gas supplier who claims that traditional beer gas has a tendency to be inconsistent in the volume of CO2 in the mixture. His claim is that CO2 in the cylinder is liquid (true but turns into a gas as the cylinder is used) and the Nitrogen is a gas. Therefore he claims that the mix will vary depending on the volume of the cylinder. I am presuming his claim would state that a fresh cylinder would pour 100% Nitrogen and as the cylinder is depleted would swing in the other direction to 100% CO2 or vice versa or some variance of the above proportions but not the correct proportion of gases. He claims to have patented a perforated dip tube in the cylinder to draw in the correct proportion of CO2/N to a 70/30% mix. I wish I had an analyzer to test his theory. Has this guy been inhaling to much CO2 or is this guy the used car salesman of the beverage gas industry or both.

[DCullender]

I'm not sure about his dip tube, how is it attached? I'm going to show this post to the gas supplier I use here in Richmond, see what they say.

[DCullender]

Spoke with my local suppliers today. They were dumb founded by this claim. Blended gas in a cannister has about a 10% error in purity because the mix is done by weight. According to my guys, to seperate gases the cannister would have to sit undisturbed for a very long time. Also, they have never heard of a dip tube that controls the blend.

[Mirko_S]

The tanks with dip tubes are for refilling purposes and not dispensing. I would imagine that the dispensing tanks are filled with seperate co2 and no tanks and not one that is combined.

[Draftguy]

The dip tube is within the cylinder and his claim is that the perforations in the tube allow for a consistent 70/30 mix from the start of a full cylinder to when it empties. Presumably the dip tube is attached to the tank valve. I am thinking he believes the gas separates at different height within the cylinder to coincide with their specific gravity.