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Old 06-28-2012, 05:41 PM   #1
ArcLight
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I just ordered the Williams Brewing O2 system. (2 micron stone)
The person I spoke to said the suggested rate is 20 seconds at a moderately high rate.

In Jamil Zainashefs book (Yeast) he mentions 60 seconds, but I don't think he specifies a flow rate.

The regulator doesn't have a gauge, but supposedly you can open/close the valve to regulate flow.


1. How long (in seconds) do you Oxygenate the wort?

2. What flow rate do you use?

3. After aerating, some (a lot) of the O2 bubbles break the surface and are released into the atmosphere. Do you use a lower flow rate, and then seal up the fermentor and shake it for 45 seconds, trying to dissolve the O2 in the head space back into the wort?

4. Anything to look out for? Mistakes to avoid?



 
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Old 06-28-2012, 06:09 PM   #2
Magnanamous
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I believe Zainashef suggests 1 minute at one liter/minute flow to acheive the desired 10 ppm O2. I don't think that its necessary to shake the wort to dissolve more oxygen-- Thats part of the joys of having an O2 set up!


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Old 06-28-2012, 06:16 PM   #3
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I have one of the older, pre- recall gauges that only has one working setting- Cranked all the way open. I do that and give it a minute's blast.
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Old 06-28-2012, 06:23 PM   #4
RmikeVT
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I have the Williams Brewing set up and I turn mine up just enough to see turbulence in the wort but no bubbles breaking the surface. I am assuming Im not seeing bubbles because the o2 is dissolving into the Wort -- I am pretty arbitrary on how long I let it go. Usually give it a 45-60 swirls around the fermentor.

 
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Old 06-28-2012, 06:54 PM   #5
ArcLight
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How many "uses/aerations" do you get out of an 02 bottle (2.1L or 1.4L)?

 
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Old 06-28-2012, 09:59 PM   #6
ODI3
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Hi Arclight,

I just ordered one of these, used it once and it got stuck.(I couldnt open or close it) on the top of the dial it says "do not force knob" and "to open turn left and close turn right"

I contacted Williams for advice and they simply said they will ship me a new one. Even though its difficult for me to order from williams(since i am canadian, and they dont ship to canada) I will definately order from them again.(pick it up at the border)

In terms of advice on flow rate, this is the response I got from williams on the unit:

"Ryan,

Our oxygen regulator is really just a dispensing unit and does not have a flow rate. However, we have found that with the regulator fully open it will drain a 2.1 Bernzomatic tank in about 1 minute. I know this doesnít help much, but we really canít tell the flow rate without a gauge and there are no gauges available for this type of regulator. If you really want to get the flow rate dialed in then I suggest getting a refillable oxygen tank with a gauged regulator from a welding supplier"

Also, mOn the package it says,
"To use: To aerate 5 gallons of wort to 70% of its oxygen holding capacity (a good level for quick yeast growth), sanitize the wand and dip into 5 gallons of freshly made cooled wort in a glas or plastic fermenter. Put on safety glasses. Turn on the regulator until you see steady bubbling (not a huge bubbling spurt), and keep it going for 20 seconds. Turn off and remove and your wort is ready for the yeast. Aeration becomes more important as the starting gravity of the wort increases."

According to Jamil and Chris White, from their book "Yeast", they recommend 8-10 ppm for average wort and yeast pitching rates.
The book also outlines an experiment that it injected pure oxygen into 5.3 gallons of 1.77 wort using a .5 micron stone with a flow rate of 1 liter per minute. results were:

shaking 5 mins 2.71 ppm
30 seconds pure O2 5.12ppm
60 seconds pure O2 9.20 ppm
120 seconds pure O2 14.08 ppm

So at the end of the day, I have no idea...

 
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Old 06-28-2012, 10:04 PM   #7
ODI3
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edit: double post

 
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Old 06-28-2012, 10:13 PM   #8
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I'd love to have a better idea on this, and maybe one of these days I'll plunk down the money for a real tank and reg.

In the meantime, I've been turning it on somewhere in the half-way range, and looking for a healthy but not excessive flow of bubbles out the stone, and waving the wand around in the wort for one minute.

The ferments have all gone great, but I really have no idea if the O2 amount is right or simply "close enough"

As of now, I've run 6 batches off my first little red O2 cylinder. It hasn't run out yet. I bought a second cylinder to be able to hot-swap as needed.
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Old 06-29-2012, 02:02 AM   #9
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I get it going so it just breaks the surface then do 60 seconds. I guess that is plenty because every single fermentation since I started that has blown off for like 3 days straight.

 
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Old 06-29-2012, 02:54 AM   #10
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Quote:
Originally Posted by ResumeMan View Post
I'd love to have a better idea on this, and maybe one of these days I'll plunk down the money for a real tank and reg.

In the meantime, I've been turning it on somewhere in the half-way range, and looking for a healthy but not excessive flow of bubbles out the stone, and waving the wand around in the wort for one minute.

The ferments have all gone great, but I really have no idea if the O2 amount is right or simply "close enough"

As of now, I've run 6 batches off my first little red O2 cylinder. It hasn't run out yet. I bought a second cylinder to be able to hot-swap as needed.
that's what i did, went to harbor freight down in union city and bought a tank and regulator for $140 or so. the tank is still going and i have no idea how many batches i've done i the yr that i've had it. i started out with the disposable tanks and the dinky "regulator" - that was too make shift for me.



 
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