| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 9 years ago | |||
| warren | "And taking note that for the Thermofisher and the Speck, we're only doing spot readings, not averages. This should change: https://github.com/jywa..." | Read more » | over 9 years ago | |||
| warren | "And the Speck too: https://github.com/jywarren/opk-speck-cli now running. " | Read more » | over 9 years ago | |||
| warren | "Note that I did not zero out the TF, and the vertical scales are wrong. Just very very early testing of the drivers. " | Read more » | over 9 years ago | |||
| warren | "And over a longer period -- 2/3 of the way through, i lit a piece of paper on fire. " | Read more » | over 9 years ago | |||
| warren | "Thermofisher working! https://github.com/jywarren/opk-thermofisher-pdr1500-cli and https://data.sparkfun.com/streams/g6Gn19yp9yU6WaObjlYO Leavin..." | Read more » | over 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 » | over 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 » | over 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 » | over 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 » | over 9 years ago | |||
| warren | "Mathew also did some good research on the ThermoFisher PDR-1500 http://www.thermoscientific.com/en/product/i-personal-i-dataram-pdr-1500-aerosol-mo..." | Read more » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 9 years ago | |||
| warren | "We now have live graphs from it -- looking good! " | Read more » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 9 years ago | |||
| danbeavers | "After further discussions with my mechanical engineer friend: If you use the manometer with tees and an orifice between them the orifice should be..." | Read more » | over 9 years ago |