Homefill math

[Swampy]

...Check the DIY concentrator mod thread.

Here's the thread my learned friend Maestro is referring to.

[drew1492]

I think it sounds like two homefills could work good for them. Linking bottles and incresing the input pressure are going to give you better rates. One may do the job I would try one first and see if it holds up.

[metalbone]

I think the 2 lpm number is wrong. I am filling an equivalent of a K in 19 hours using 2 HFs and 2 platinums (it doesn't matter if is the platinum 5 or 10) filling 2 Ks. Dividing by 2, that is 1100 cf of O2 in 38 hours, which is way more than 2 lpm. Also, the Platinum doesn't put out anywhere near 15 psi and it is made for the HF. I upped the PSI on my Platinums, but no way they put out 15 psi...maybe 10 if I am lucky.

FWIW, I was runnung a mirage off the 2 HF system, no problems runnnung uit for 6 hours , still had plenty of oxy let over. I also did the math on the rix microboost a number of years back and it wasn't that much better than the HF, but it was a whole lot more expensive.

[Aussie]

Please disregard everything I said earlier, I opened my concentrator today and everything is not as it appears from the outside ...
The flow adjuster on the front of the unit is connected only to the outlet from a second flow adjuster on the inside of the unit via a Y connector. Opening the flow adjuster on the front to 2lpm in effect bleeds oxygen from the unit. Where does it go? Just to the inside of the casing ... no hose attached ... the output of the exterior flow adjuster just ... opens. In effect, setting the exterior adjuster to 2lpm lowers the pressure until the Homefill unit kicks in, then setting the lpm to 0 increases the pressure to the homefill to maximum ... hmmm.
The interior flow adjuster is set to 2lpm, which I increased a little bit and my setup seems to function better. I also found out that the sieve bed was last serviced in 2001 according to the service label ... I bought the unit in 2010 from UO. Whether UO serviced the sieve bed before selling it to me or not, I have no idea, but it's probably time for me to rejuvenate the sieve bed.

[STROKER]

mr. australia, i was told by the pro8 peeps that the sieve bed material is infinately good if its used in the right way.
moisture is its biggest enemy but under normal use it should have a very long shelf life.

i have seen a guy on the bay that offers seive bed repours for 80$ but i also understand that to be effective the zeolite must be tamped and packed to serious tight tolerence. if you just pour it in, it will work but not for long.

[Aussie]

Good, info, thank you mr. USA! While I know about the homefill backwards, now, I had no idea what the inside of my concentrator looked like until I had a look today.