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ArcLight 08-01-2012 09:08 PM

Oxygen Wand
 
My Oxygen system (form Williams Brewing) doesn't have a gauge so I have no way of knowing how fats the O2 is flowing.

I crack the valve just enough that I hear the flow in the wort, but don't see any big ripples. I do this for 60 seconds.

My question is - what does your wort look like, with respect to bubbles/ripples, when you oxygenate?

Am I not using enough O2?


(for what its worth, I first shake the fermentor for 60 seconds)

PacificTiger 08-01-2012 09:25 PM

I got the same setup a couple of years ago. Do about the same as you with a small amount of bubbles forming at the top of the fermenter. I typically let it run for 60-90 seconds.. It seems to do the job but I’ve never measured the amount.

tgmartin000 08-04-2012 03:48 PM

Yep. About a minute once I see bubbles. I know guys have upgraaaded their regulator with those systems to measure the flow.

Golddiggie 08-04-2012 04:08 PM

I got tired of having no idea how much O2 was flowing into the wort with that regulator. So, I picked up an O2 regulator with a flow meter and connected it to a standard O2 bottle. Now I can send different O2 LpM rates into my wort and not worry so much. I'm planning on getting an O2 meter soon, so that I'll be able to test the infusion level for different O2 worts. That way I can be even more certain of the O2 level (ppm) in the wort.

With the O2 regulator with flow meter being so cheap (easily found under $30) and how many batches you get even from a 20 cubic foot tank, it comes out to being as cheap, if not cheaper, than the tiny bottles you get form HD and Lowe's. At least around here it is.

ArcLight 08-05-2012 01:44 AM

>.I picked up an O2 regulator with a flow meter a

Please post a link to where you got it.


>>20 cubic foot tank,

How many 5 gallon batches is that good for? 100?

Golddiggie 08-05-2012 03:02 AM

http://www.amazon.com/Oxygen-Regulat...I2810UNJ8SQHNW

Still on my first fill of the 20 cubic tank. I'll have to check my records to see for certain but I believe I've already used it for 10-20 batches. Still plenty of O2 left in it.

Justintoxicated 08-05-2012 03:07 AM

Does oxygenating wart with a stone really work? I know for fish tanks Air stones primarily work by creating surface agitation, the bubbles release little to no air into the water itself.

Co2 on the other hand can be injected into fish tanks as micro bubbles and you can see the Co2 dissolve into the water on it's way to the top.

So for those of you injecting pure oxygen into wart, can you physically see the bubbles shrinking or disappearing into the wart?

ArcLight 08-05-2012 01:53 PM

>.So for those of you injecting pure oxygen into wart, can you physically see the bubbles shrinking or disappearing into the wart?

Typically you inject the O2 near the bottom. If you have a higher flow rate, you will see the wort ripple, as its displaced, and O2 is lost.
In other words - a high flow rate probably does nothing.
But at lower flow rates, you hear and feel the displacement, but don't really see the ripples.
I use a low flow rate, for a minute.


>>Does oxygenating wart with a stone really work?

I can't prove it, I only have anecdotal evidence for 1 batch (I haven't taken a FG reading on my second batch yet).
The first batch did attenuate more. But I also used yeast nutrient, and I mashed at 150.
I am bottling later today and will see how that is.

day_trippr 08-05-2012 02:36 PM

Quote:

Originally Posted by Justintoxicated (Post 4306004)
Does oxygenating wart with a stone really work?[...]

Of course, and as proven with DO meters in the hands of reputable individuals...

Cheers!

Justintoxicated 08-06-2012 05:31 AM

Quote:

Originally Posted by day_trippr (Post 4306507)
Of course, and as proven with DO meters in the hands of reputable individuals...

Cheers!

Well I have no doubt that adding surface agitation oxygenates the wort, what what I'm more curious about is if the oxygen is actually absorbing into the wort via the airstone, vs the airstone creating surface agitation that allows oxygen exchange.

In the case of a fish-tank airstone, it's the surface agitation that oxygenates the water, not the air passing through the water itself. I would imagine wort would be the same, but I could certainly be wrong. For fish, it's better to create a slight ripple in the surface of the tank vs using a noisy airstone for just that reason.

If this is the case though I would prefer other methods of creating surface agitation over pumping in oxygen, to reduce contamination risk, and cost.


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