gas
gas


Author Comment Last activity Moderation
loganw "Cool! I was thinking about attaching a peltier cooler to it. I can't find much info on what that does to a thermopile sensor though, since they bas..." | Read more » almost 6 years ago
mathew "I found this handy thermoelectric cooler module calculator: http://tetech.com/peltier-thermoelectric-cooler-module-calculator/ " | Read more » almost 6 years ago
mathew "great to see these initial assumptions! and awesome work on finding both a low-cost sensor and a low-cost filter. The FLIR Lepton thermal images a..." | Read more » almost 6 years ago
eustatic "I support the use of the term Sniffle! Lauren Sullivan would probably agree! the battery clip will also be tres useful " | Read more » about 6 years ago
Bob "After 3D printing the battery clip, you may need to press the battery arms together while snapping it onto the Riffle board. I uploaded the battery..." | Read more » about 6 years ago
cfastie "Nice battery clip. I covered the back of my Riffle with adhesive Velcro hooks and wrapped some adhesive Velcro loops around the battery. But I migh..." | Read more » about 6 years ago
kensanfran "Hello, Sorry just noticed this post. I've been collecting my links and references on this DIY gas sensor calibration page of my wiki. I'm also tin..." | Read more » about 6 years ago
kkoerner "LukeS good to know, thanks for testing out those pumps and posting your results! " | Read more » over 6 years ago
mathew "Great writeup, Luke! cool work. " | Read more » over 6 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 6 years ago
pral2a "Hi @kensanfran On the threat below you mentioned: "So another part of my exercise has been building up various DIY calibration rigs using pre-mix..." | Read more » over 6 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 » almost 7 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 » almost 7 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 » about 7 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 » about 7 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 » about 7 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 » about 7 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 » about 7 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 » about 7 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 » about 7 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 » about 7 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 » about 7 years ago
danbeavers "Perhaps @Stevie could order them. " | Read more » about 7 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 » about 7 years ago