| 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 » | over 6 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 » | over 6 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 » | 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 years ago | |||
| mathew | "rotameter on the table reading .25L/m rotameter on a block of foam for vibration isolation, reading .3L/m " | Read more » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 years ago | |||
| mathew | "I broke the tip off the tube with a pair of pliers. I do need a proper tip breaker-- my method left a good mess. " | Read more » | almost 9 years ago | |||
| mathew | "Can i get a 250ml pipette? My choice of graduated cylinder volume was based on a desire to make the time period I measured long enough that my reac..." | Read more » | almost 9 years ago | |||
| mathew | "the pump's output seems fairly consistent without a warm-up. I wanted to see if the setup retained its configuration from yesterday, so I ran thre..." | Read more » | almost 9 years ago | |||
| DavidMack | "Looks like a nice setup! For bubbles, the cheap ready made option would be any liquid bubble--the kid's toy to blow bubbles. @danbeavers I think ..." | Read more » | almost 9 years ago | |||
| danbeavers | "Looks like you had problems breaking the tip of the tube. What process did you use? I am really curious to find out how much flow variation there..." | Read more » | almost 9 years ago |