| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| Dave-O | "You're welcome, @nshapiro ! Is this the same EPA approved method that you used? https://www3.epa.gov/ttnamti1/files/ambient/airtox/to-11ar.pdf And ..." | Read more » | almost 8 years ago | |||
| nshapiro | "Thanks, @Dave-O ! We did some side by side testing of this method next to an EPA approved method and we found these tubes to be cross contaminated ..." | Read more » | almost 8 years ago | |||
| kkoerner | "LukeS good to know, thanks for testing out those pumps and posting your results! " | Read more » | over 8 years ago | |||
| mathew | "Great writeup, Luke! cool work. " | Read more » | over 8 years ago | |||
| LukeS | "@kkoerner, I tried a similar pump when I was researching this and it created too much turbulent/pulsed of the air stream to get a good measurement ..." | Read more » | over 8 years ago | |||
| nshapiro | "@kkoerner Hi Karl! Great find! It would be fantastic if you could request a quote on these. We are planning on have a lending library of these tool..." | Read more » | over 9 years ago | |||
| kkoerner | "Any thoughts on using a smaller pump? If you're only trying to draw 0.3 SLPM, there are a couple of pumps (see the attached datasheet and catalog) ..." | Read more » | over 9 years ago | |||
| danbeavers | "It appears you need some more ventilation or perhaps start using the remediation process. http://publiclab.org/notes/nshapiro/10-20-2014/diy-indoo..." | Read more » | over 9 years ago | |||
| mathew | "Just repeated this test today at 26 degrees, and temperature corrected we got 25ppb. So good news: consistency. Bad news: consistently hazardous c..." | Read more » | over 9 years ago | |||
| mathew | "I ran a formaldehyde test over by our shipping station, now that the flow on our lending kit is calibrated. We got 26ppb, or about 3.5x the chroni..." | Read more » | over 9 years ago | |||
| mathew | "Our portland office has .026ppm (26ppb) of formaldehyde when measured over by our packing and shipping area. That's over 3 times the chronic dange..." | Read more » | over 9 years ago | |||
| danbeavers | "Another observation: It would be good to have a check list for the measurement. For example: Verify that the humidity is above ?? and below ??..." | Read more » | over 9 years ago | |||
| danbeavers | "@Mathew The following is from a mechanical engineer friend of mine: Assuming you could pull a reasonably good vacuum on the orifice, you could ge..." | Read more » | over 9 years ago | |||
| danbeavers | "Mathew: That sounds like a mechanical engineer (which I am not) question. I SUSPECT that it will be the sum of the restrictions because of the lo..." | Read more » | over 9 years ago | |||
| nshapiro | "Here is a photo of the tip breaker that is on some of the analog pumps. We could also pre-score them in a standardized way to create consistent ope..." | Read more » | over 9 years ago | |||
| mathew | "@Danbeavers what if we put a standardized, small orifice on the broken end of the glass tube that is always smaller than a hole broken into the tub..." | Read more » | over 9 years ago | |||
| danbeavers | "Perhaps @Stevie could order them. " | Read more » | over 9 years ago | |||
| warren | "I'm arriving tomorrow -- if you could order those I'd buy them off of you when I arrive, or we could just order tomorrow night when I get in. I jus..." | Read more » | over 9 years ago | |||
| 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 » | over 9 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 » | over 9 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 » | over 9 years ago | |||
| mathew | "I have small plastic valves, had to order 5. I'll send one out. " | Read more » | over 9 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 » | over 9 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 » | over 9 years ago |