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Old 11-04-2011, 03:13 PM   #1
McCue
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Default Anyone tried this low cost oxygen flow meter?

I've been looking for something for a while to measure the flow rate from my oxygen cylinder that didn't cost too much and came across this today. Anybody tried it?

http://www.activeforever.com/p-25637...-meter-_-50379

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Old 11-04-2011, 03:55 PM   #2
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It takes measurements in Liters/min....how are you going to know what that translates into ppm dissolved Oxygen?

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Old 11-04-2011, 04:07 PM   #3
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It won't translate to ppm. As I understand it there is no way to directly measure that for under about $1000. The next best thing is to have a repeatable process. The stuff I've read all lists oxygenation times assuming a flow rate of 1 lpm through a 0.5 micron stone, but I've never had a way to know if my flow rate was anywhere near 1 lpm. If this thing can help me keep the flow at that constant rate then at least I'll always be delivering the same amount of oxygen and I can adjust the rate over time based on the results.

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Old 12-17-2011, 03:47 AM   #4
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McCue, did you ever get that? I'm looking to do the same exact thing.

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Old 12-29-2011, 04:13 AM   #5
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Explains how to use l/min
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Old 12-31-2011, 01:30 PM   #6
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Quote:
Originally Posted by Hackrsackr View Post

Explains how to use l/min
Thanks for all your help.
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Old 01-01-2012, 04:01 PM   #7
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Yeah, I ordered 2 of them. They're not perfect for the job because they're designed to measure higher flows so 1 lpm is on the very low end of the scale. That being said it was certainly better than nothing because at first it wasn't reading anything and it turns out that my cylinder was nearly empty. Then with the new cylinder it was well over 2 lpm, so there is quite a range of flows comming out of the cylinder depending on how full it is. I found it easier to regulate at 1.5 lpm and will be basing my times on that rate.

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Old 01-01-2012, 06:16 PM   #8
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Quote:
Originally Posted by McCue View Post
Yeah, I ordered 2 of them. They're not perfect for the job because they're designed to measure higher flows so 1 lpm is on the very low end of the scale. That being said it was certainly better than nothing because at first it wasn't reading anything and it turns out that my cylinder was nearly empty. Then with the new cylinder it was well over 2 lpm, so there is quite a range of flows comming out of the cylinder depending on how full it is. I found it easier to regulate at 1.5 lpm and will be basing my times on that rate.
I hope it works out for you, but keep in mind that meters tend not to read as accurately at the extremes of their range as they do the middle. So that 1 lpm, right at the low end of the range, may not be 1 lpm at all.
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Old 01-01-2012, 06:27 PM   #9
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You can score actual O2 flow meters MADE to go onto standard O2 tanks on ebay in the $20-$30 range most of the time (used). New ones can run over $100-$125 though. If you get one that doesn't come with the barb fitting for the gas line (you can use the standard 3/16" beer line there) then your local welding gas supplier (same place you can get the tank) should be able to get one to work. I got two there for my flow meters, made of brass, so that they won't break when I put a clamp onto them.

The flow meters I have range up to 8 LpM of O2, which is pretty much all you need for most brewing purposes. They both start at below 1 LpM, allowing me to adjust the flow to get to where I want it to be easily.

You can also look on amazon.com for the meters.

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Old 01-02-2012, 03:41 PM   #10
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You can check the accuracy by pumping the oxygen into a balloon for 1 minute and then calculating the volume of the inflated balloon.

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