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Author Comment Last activity Moderation
mathew "@eustatic-- you definitely didn't kill momentum on the project! Once we had the calibration locked in, we needed something to test for. The Kitag..." | Read more » about 5 years ago
gretchengehrke "@eustatic, no worries -- Mathew got this pretty far (complete, perhaps?). The video is embedded in this page: https://publiclab.org/wiki/formaldehy..." | Read more » about 5 years ago
eustatic "I ended up with pump calibration kit...did i kill the momentum on this project? signs point to yes @gretchengehrke I think mat did a youtube video " | Read more » about 5 years ago
mathew "I've been in touch with Airmetrics over the issue. they're been very helpful and responsive. (see below) " | Read more » almost 6 years ago
mathew "Airmetrics got to scratching their heads over this difference as well! It turns out there is an additional variable that isn't listed in the manua..." | Read more » almost 6 years ago
warren "Do we have contacts who've used these instruments that we could reach out to for input on these calculations? " | Read more » almost 6 years ago
mathew "I contacted some folks at Airmetrics, and their initial reaction was that I appeared to be doing it correctly (but they didn't really dig in). The ..." | Read more » almost 6 years ago
mathew "@gretchengehrke 1) yes, P and T are pressure and temp. There's Pstd and Pact (P standard and P actual) same for temperature. Those are the tempera..." | Read more » almost 6 years ago
gretchengehrke "Hi Mathew, There are three things that come to my mind: (1) To think more through Equation 1, I'm curious what P and T are. Pressure and Temp? (2) ..." | Read more » almost 6 years ago
JSummers "Thanks Chris, I don't expect that anyone will be making much money off of open-source science stuff. I see this as more of a service to my discipl..." | Read more » over 6 years ago
cfastie "Wow, this is a gorgeous piece of equipment. It seems to represent a huge effort in design and construction. I was pleased to learn that continuous..." | Read more » over 6 years ago
mathew "ran some tests on the different Kitagawa tubes that have been used. I put the end into the drilled-out brass tube I've been using to break them, a..." | Read more » over 7 years ago
mathew "I bought and tried a 50ml pipette and made a dropout jar. The jar kind of works-- some condensation still seems to get through, but never bubble..." | Read more » over 7 years ago
DavidMack "@mathew I believe you have the VWR series FR2000 rotameter, which the accuracy is specified as +/- 5% of full scale, so that's +/- 0.05 lpm. see h..." | Read more » over 7 years ago
danbeavers "@mathew What do you mean by " small control orifice into a brass rod and put it at the intake"? I hope you are thinking manometer . . . What I s..." | Read more » over 7 years ago
nshapiro "@mathew were the two tubes that you are comparing opened by different means? perhaps if we can just standardize the tip breaking better we wouldn't..." | Read more » over 7 years ago
mathew "ok, looking at a photographic record of the flow rate between the two rotameter measurements it does seem like the change in flow is noticeable. F..." | Read more » over 7 years ago
mathew "@danbeavers I couldn't find that little heart. It may have been lost when the box arrived. @davidmack I ran the VWN rotameter with the valve all t..." | Read more » over 7 years ago
danbeavers " @mathew That heart shaped object is the abrasive chip. When @nshapiro and I did my first measurement Nick said the scoring chip should be in the..." | Read more » over 7 years ago
DavidMack "I think the rotameter is going to be easier to use than the critical orifice/differential pressure method, especially with a fluid manometer. You ..." | Read more » over 7 years ago
mathew "rotameter on the table reading .25L/m rotameter on a block of foam for vibration isolation, reading .3L/m " | Read more » over 7 years ago
mathew "hmmm.... the level of the rotameter goes and stays at .3L/m when I hold it down to the table at a level point. the vibration of the pump and level..." | Read more » over 7 years ago
mathew "I ran a test in our kit packing area and found 26ppb of formaldehyde. while running the test, a Rotameter from VWR arrived in the mail. I hooked ..." | Read more » over 7 years ago
danbeavers "@davidmack I don't know how much vacuum a 5lpm pump will produce but it needs to generate "below 7psia" to get sonic or choked flow. An aquarium ..." | Read more » over 7 years ago