gas
gas


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danbeavers "The cheapest flow meters in the appropriate range that I could find: $18.90 http://www.ebay.com/itm/0-1-1-5L-Oxygen-Air-Flow-Meter-Gas-Flow-Meter-..." | Read more » about 7 years ago
danbeavers "Mathew: The "super simple" flow meter you linked to is what DavidMack was describing in the first post comment. That is real good to calibrate a ..." | Read more » about 7 years ago
warren "Actually that'd be super great. If they'd arrive before next Thursday, Nick and Mathew, could you send them to Propeller? Propeller c/o Public Lab..." | Read more » about 7 years ago
mathew "I have small plastic valves, had to order 5. I'll send one out. " | Read more » about 7 years ago
warren "Oh I see! I had read it as 2IN. My brains a little slow right now, sorry. I need to be watered. " | Read more » about 7 years ago
nshapiro ".1-1 is correct. I have three right now. i can send you one. but you would need to get the valves. my supplier just ran out. " | Read more » about 7 years ago
warren "1 VWR FLOW METER ACR 2IN.1-1LPM ($74.62 + shipping). Is that supposed to be 1-10 LPM? Thanks! " | Read more » about 7 years ago
warren "Just size, really. I have to order one of these too so I can use it in the video I'm working on. " | Read more » about 7 years ago
mathew "it has to be upright, yes. what other options are you thinking of? " | Read more » about 7 years ago
warren "OK, cool. Are there options for the flow meter Nick's used above, in terms of size, etc? It has to be upright, right? " | Read more » about 7 years ago
mathew "I think for the neck unit-- we need to have a flow meter in the flow. That is a perfect configuration to use in the buy your own kit, whereas we'r..." | Read more » about 7 years ago
warren "Hey @mathew, do you think the goose neck thing I put together is worth pursuing, or is compatible with the box idea you posted? Just want to know h..." | Read more » about 7 years ago
mathew "@danbeavers I am interested in making our data usable in court, but I'm also trying to be budget-sensitive. we're looking to mail these around fro..." | Read more » about 7 years ago
nshapiro "i actually have three of those pumps on my desk. they have a counter up to 10 and a thermal ring (that doesn't appear to work) for temp and a tube ..." | Read more » about 7 years ago
danbeavers "Answering my own question: "The KITAGAWA air sampling pump reproducibly draws 100cc of sample air" So that would be 90 pump cycles thus makiing i..." | Read more » about 7 years ago
danbeavers "Mathew: Perhaps I am not understanding some objectives here. Is the idea to be able to use one of our measurements in court? I doubt that that i..." | Read more » about 7 years ago
nshapiro "I think this looks great! The air intake is in one end of the tube. so we could have one less inlet to cut in the top panel and we could have it s..." | Read more » about 7 years ago
mathew "I'm trying to think about how everything might go together for shipping-- I'd like to put the monitor in a plastic suitcase with a top panel cut to..." | Read more » about 7 years ago
mathew "@Danbeavers If you ream it you're right-- I was thinking about just a drill hole and that note. Vibrations on either a cheap drill or a poorly secu..." | Read more » about 7 years ago
nshapiro "+1 to the time relay delay it could be adhered to the belly of the pump. Digging the flow meter debate! " | Read more » about 7 years ago
danbeavers "Mathew: Why would you doubt the accuracy of a stepped bore? A reamer will provide very accurate hole size and ball bearings have very accurate di..." | Read more » about 7 years ago
mathew "@danbeavers hmm... the variability in the break and its effect on flow could be quantified with a more accurate flow meter. I wonder how variable ..." | Read more » about 7 years ago
danbeavers "Another approach to this problem would be essentially what Drager does. We could construct a manual vacuum pump. It would essentially be like a b..." | Read more » about 7 years ago
danbeavers "Thanks Nate for posting my thoughts. I wanted to comment on Mathew's idea of calibrating the pump before shipment. I assume what is meant is that..." | Read more » about 7 years ago