butterpants
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That's what I do as well.... no issues with clogging?
That's what I do as well.... no issues with clogging?
none, i've had this wand for 3 years and it's never clogged on me. hell, i've even touched it like they say you're not supposed to :rockin:
that's very generous of you to refer to that little black knob as a regulator it turns the gas on or off, no regulation involved. i'll look in my garage to see if i still have mine, i may have thrown it away, if i find it i'll send you a pm.
For that bernzomatic deal, use this as a guide:
...
Not sure if they had it all the way open or throttled some.
I guess my question then is whether it is throttled or not. If you open it fully it creates quite a bit of oxygen flow, a lot of it escapes as bubbles to the surface.
the O2 still makes it into solution in spite of the portion you see bubbling away. the williams O2 system with the disposable tanks does not have a real regulator, it's basically on or off.
I have an oxygen tank with welding regulator. Anybody have an idea where to set the outlet pressure for a 1 LPM flow rate? I've been adjusting it to just get bubbles and running for about a minute, but would like to be a bit more scientific about it.
I've been using a 2 micron stone, a medical regulator set at 3 LPM for 30-60 seconds, depending on type, gravity, etc. According to your formula,
time = (0.00265 * ppm * volume) / flowrate
if I want 10ppm, for 5 gallons, at 3 LPM i'd flow for .044 minutes, or 2.65 seconds. That can't be right.
But with respect to a true regulator that controls pressure, you can only control volume with a red tank setup.
A true regulator regulates the pressure that is leaving the tank. Best way.
But if you control volume dispensed,... well not as desirable, but,...still on the effective side. To a point.
Point I'm trying to make: Red tank setups are not the best,... but they are better than some other setups.
I used red tanks for several brews, then scored my current setup on the cheap. $50 med gas, big cylinder, full with regulator. 2000psi on gauge.
Would I go back? Yes,... it is my backup.
pb
When my DO meter worked, this is the data I collected.
This chart is for 5.25-5.5 gal batches in a 6.5 gallon carboy oxygenated with a .5 micron stone. They are listed chronologically, not by OG or temp or time so you have to study the data for a few minutes. There are too many dependents to graph it out.
The measurements shown on that table were the only ones I got from that meter before it wouldn't calibrate anymore. I was pretty disappointed with it. It is the older Milwaukee model that the MW600 replaced.
orangehero said:Temperature and SG both affect how much oxygen dissolves. Also how are you adding the oxygen? Are you dropping it into the fermentor or are you stirring? I don't think you can make a universal formula for oxygenation. In my opinion you should just try to be as consistent as possible and pay attention to how your yeast respond.
I didn't see anywhere in the thread where the data from White's Yeast book for aeration using o2 is reported. On page 79 from the book, it is reported that the author's measurements with 5.3g of 1.077 wort using .5 micron stone with a 1 LPM flow rate yielded 9.2 ppm for 60 seconds and 14.02 ppm for 120 seconds. Personally, I have followed these guidelines. The formula from the OP seems to be significantly different from this book's recommendation.
Alternatively.... for thrifty people.
Shaking or an aquarium pump provides basically perfect aeration for everything other than big beers. 8ppm. It actually is a quite controlled process since you saturate at 8ppm.
An initial aeration followed again in 8 hours provides the perfect levels for most big beers. 8ppm+8ppm = 16ppm
So, if I want to go this route, what "size" of aquarium pump are you using and how long do youe aerate to get 8 ppm??
I forget if it was mentioned earlier (I remember seeing a pic someone posted), but what flow meter have you guys found to be useful to work with your airstone O2 systems? I received a fermentap O2 system with a 0.5 micron stone for Xmas, and just picked up an O2 bottle from HD. So I can just adjust flow and time it, like some have said they do, but I too would rather see a flow value and be able to replicate that for a certain amount of time each batch.
So what model is the best for is kind of set up (something in-line with barbs attachments for the tubing, I assume?). Is it the pediatric models that to from 0-4 lpm? That seems to be the best for the low flow rates I see recommended. Thanks for any advice!
drunkenmonk said:I initially set out to find an in-line flow meter, but they're hard to find and pricey; especially at low flow rates. I ended up buying a regulator that controls flow rate for only $48. That's probably not good advice since you just got your fermentap system.
I have the Williams brewing wand and 'regulator' system for the bernzomatic tanks. Can someone with a real regulator and the same 2 micron air stone give some general observations for different flow rates? I've always turned it on just enough to get a decent stream of bubbles cresting the surface but the regulator can go much higher. What does 1 lpm or 3 lpm look like?
I've always aerated for 30 seconds as I recall reading somewhere that this was more than enough time for adequate aeration. I've never liked that answer and always wanted a DO meter to do exactly what you are doing. I applaud your effort OP.
How much are the bottles of O2 at a hardware store typically? Trying to decide whether investing in a larger setup is worthwhile as a long term investment ...
dstar26t posted some measured data which I did a new curve fit to in a previous post:
ppm = (8.4905 * LPM * minutes aeration time) / gallons wort + 7.9254
The curve fit is so-so and it doesn't have a zero intercept (i.e. you get PPM oxygen with no oxygenation). That said, it does an okay job at matching the data from White and Zainasheff. Where they predict 9.2 ppm, this equation predicts 9.5 and where they predict 14.0 ppm, this equation predicts 11.1. If you include this data, the equation changes slightly to:
ppm = (8.4294 * LPM * minutes aeration time) / gallons wort + 8.1019
I'll update the original post to this. It's not perfect as it ignores factors such as wort temperature, OG, saturation, etc. but it gives you a rough number to shoot for.
This just shows that there are more variables involved than those accounted for in the formula (i.e. flow rate, volume and time). In other words the formula is useless.Using a Dissolved Oxygen meter I found dosing for ~2 minutes yielded ~12ppm of additional O2 with the parameters listed above. This leads me to wonder how another formula based on test data could recommend 4 times the duration of O2.
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