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  #1  
Old 10-10-2017, 09:34 AM
ScottB ScottB is offline
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Join Date: Apr 2016
Location: West side of Fort Worth
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Default Oxygenation of wort

Do any of you Brew Masters have experience with measuring dissolved oxygen in wort? Is there a practical way for home-brewers to measure it? If you use pure oxygen, how much/long do you use to aerate your wort (10 gallon batch)? I just bought an oxygen bottle and .5 micron stone and need to figure out how to use it properly.
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Old 10-10-2017, 10:52 AM
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vertigo vertigo is offline
Mike Treadway
 
Join Date: Feb 2013
Location: Keller, TX
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There are tools out there to measure it but I don't think it's necessary to measure it; and believe me when I tell you I measure everything.

I personally oxygenate beers with pure oxygen between 30 seconds and 1 minute depending on the OG of the wort. If it's a really large beer (i.e 1.110+) I'll give it another shot of oxygen 8 hours after pitching, although there have been times I wasn't able to because fermentation had already kicked off. I had one erupt on me like a volcano once when I did that so if there's already a sizable krausen layer on it, I don't disturb the monster.

According to a pod cast on the brewing network, Jamil said you'd have to go crazy (like over 5 minutes) to over oxygenate. I can't remember which episode or I'd post it. I hope this helps.
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Old 10-10-2017, 02:55 PM
ScottB ScottB is offline
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Default Oxygenation of wort

Thanks Mike, I really appreciate the reply. I've got a couple of follow up questions. What flow rate do you use on your regulator? Is that with a .5 micron stone? How big is your batch size? Thanks again.
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Old 10-10-2017, 03:14 PM
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vertigo vertigo is offline
Mike Treadway
 
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Quote:
Originally Posted by ScottB View Post
Thanks Mike, I really appreciate the reply. I've got a couple of follow up questions. What flow rate do you use on your regulator? Is that with a .5 micron stone? How big is your batch size? Thanks again.
I bought it so long ago, but I'm pretty sure it is .5 micron. There's only so much oxygen your wort will take so I open up the regulator enough where I can hear it bubbling to the surface. Any more than that and I feel like I'm just wasting oxygen. My guess is I could dial it back even further and I'd still be wasting oxygen. My regular doesn't indicate a flow rate so I can't tell you more than that.

Mine range from 5.5 gallons to 12 gallons. I don't open up the regulator any more for big batches than I do for smaller ones because again, I think most of the oxygen just escapes out of the top anyway.
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Old 10-11-2017, 10:33 AM
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Brandonovich Brandonovich is offline
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I will second what Mike said, just open the regulator enough that bubbles are barely coming out. If you don't, you will blow through oxygen tanks like crazy. I do the same, about 30 to 60 seconds depending on the beer and whether I am using dry or liquid yeast.
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