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Home Brew Forums > Home Brewing Beer > DIY Projects > Other > inline o2 injector
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Old 08-16-2008, 09:09 PM   #1
beerthirty
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Default inline o2 injector

I've been wanting to do this for awhile and if I would have realized how cheap and easy it was I would have done it sooner. My injector is made from brass 1/2"FPT Tee, 1/4 compression x 1/2MPT, 3/8 compression x 1/2MPT, 5/8 compression x 1/2MPT and a .5 micron aeration stone. It all screws together and apart for easy cleaning. I had to drill out the 1/4 for the air line because it was not a bore through design and I replaced the 3/8 brass ferule with plastic so it could be removed from the chiller. The 5/8 connector is for 1/2" ID hose to go to the fermenter. I used a larger hose here so it might defoam a little on the way to the fermenter. It took longer to find the parts than to put it together. Cost was $16 plus the stone. It works with CFC's


I want to find an o2 flowmeter that will display less than the 1-15LPM of standard medical flowmeters but until I do will just have to guess.

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Old 08-17-2008, 05:05 AM   #2
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Here is a suggestion, look for a Dwyer VFA-1 acrylic flow meter and set flow rate to .5 SCFH and use a 3 minute duration for a 6 gallon batch size. The flow and duration numbers were developed over 3 years with average OG of 1.055 and using ready to pitch vials by white labs and wyeast without starters for repeatability. Higher flows and longer durations greatly increased attenuation unless so much O2 was used that there was foam instead of absorption, lag times were usually greater than 12 hours with FG numbers at spec for yeast strain used at flow and durations above.

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Old 08-17-2008, 06:46 PM   #3
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I like! (10 chars)

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Old 08-17-2008, 08:04 PM   #4
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Not sure how easy it would be to add, but a site tube downstream of the injector would be nice so you can monitor the bubbles. I know of one brewery that didn't have one (yet), there was a problem with their o2 system and ended up with 15bbl of unoxygenated wort.

Of course in a homebrew setting its a bit easier to know its working, but it'd be a nice toy to have.

Props on the idea, I've been thinking about doing something similar for a while now

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Old 08-17-2008, 08:52 PM   #5
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I figured it to be easier to use a flow meter on the O2 line. I'm currently researching what O2 flow to run at a given wort flow rate of 2.5LPM (equates to roughly 12.5 gallons in 20 min)to end up with 12-20 ppm of dissolved O2 @ 70F. Then I will just set the O2 flow meter to the desired rate and the wort into the fermenter should have the optimum O2 levels with no O2 wasted. I'm using the above wort flow rate as my standard because that is what my chiller flows in single pass chilling. I will post results eventually, since I'm having trouble with all the variables and math it might take awhile.

Thanks Klaude, after some searching I think I found some that will work and only $30.
John Beere, thanks, I always like the KISS principle, but am still hoping to someday integrate the DeepSix automation into my equipment.

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"I've got a fever... and the only prescription is, MORE CARBOYS!"
primary- Tangerine Dream, SWMBO slayer,
serving- amber ale hop experiment #6, Roggenbier, apfelwine
planning- Cru?
conditioning- 9/9/09 barleywine
Drink water?... Never, fish fornicate in it.--- W.C. Fields
Most problems can be solved with the proper application of force.

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Old 09-10-2008, 05:21 AM   #6
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Quote:
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Thanks Klaude, after some searching I think I found some that will work and only $30.
so what did you end up going with? links? pics? any more info??
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Old 09-10-2008, 08:08 PM   #7
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so what did you end up going with? links? pics? any more info??
yeah...
no teasing us, saying you found a new toy, and not telling us where we can get one ourselves...
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Old 09-11-2008, 12:17 AM   #8
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I have fallen flat on my face trying to do the math with temp corrections and converting ppm to LPM but here is the flow meters I have found. General Laboratory Supply: Products
here is a page of formulas that I was trying to work with
Correction Formulae & Sizing
the flowmeters only have a 150* temp range but since I was planning on installing at the output of my chiller I don't see temp as a problem for the liquid meters. They also have the gas meters to measure the O2 rate but since the math failed I have been winging it using a clear output hose so I can see the bubbles. I'm still looking for a hi temp flowmeter to use on the output of the mash tun and HLT for fly sparging. Metering got put on the back burner since I switched to keggles from pots and still calibrating the new rig. Anyone who wants to take a stab at figuring out O2 flow levels please have at it.

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Originally Posted by the_bird View Post
"I've got a fever... and the only prescription is, MORE CARBOYS!"
primary- Tangerine Dream, SWMBO slayer,
serving- amber ale hop experiment #6, Roggenbier, apfelwine
planning- Cru?
conditioning- 9/9/09 barleywine
Drink water?... Never, fish fornicate in it.--- W.C. Fields
Most problems can be solved with the proper application of force.
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Old 03-12-2009, 02:00 AM   #9
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very clever, beerthirty.

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Old 03-12-2009, 02:49 AM   #10
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you are almost there, build one like this :





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