Filling station

[Uncle Pug]

Originally posted by omar
Pug,

Try running just air and monitor the O2 while you run it up to 3500 psi. When I did this I found that the O2 content increased about 1%. I have found that I need to run my compressor for about 15 minutes prior to doing any mixing. I set my oxygen analyzer to this air and then start mixing.

Hmmmm.... I'll give it a try.... but wouldn't the FO2 change anyway as the cfm slows down but the O2 flow remains the same into the blender???? I just averaged it out and my nitrox fills are very consistent....

I noticed that I was getting a little blow by and pulsing at the air intake when the compressor gets up to higher P. This may or may not work with your blender I don't know how Scott put it together.

I get pulsing too even at lower psi... I called Arnold and talked to him about it and he said that is the nature of things (my paraphrase)... The blender Scott built has a venturi machined inside where the He & O2 are introduced.... I have a large filter on top that I suspect acts as a blending reservoir....

I have a picture of the fill station on my profile...

 

[omar]

Pug,

For the O2 that's what I would expect to occur. I don't see mine creep that much when I set it the way I mentioned.

I have filter on the end of my intake as well. I have been thinking of adding a simple rubber flapper valve on the intake to stop any back pressure. But I need to give it some more thought before I do that.

omar