| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| subir | "Wow, thanks once again. Its been many months searching for such information from 'experts' i know locally but none were so clear and responsive. Re..." | Read more » | about 5 years ago | |||
| guolivar | "Great tear-down! I see that a lot of love went into the Sensiron design and I mostly agree with the comments ... the issue of the HEPA filter is m..." | Read more » | about 5 years ago | |||
| subir | "Hey thanks a lot! Your reply is very interesting and so are your explanations. Here's a 'tear-down' of this sensor, and with fantastic explanations..." | Read more » | about 5 years ago | |||
| guolivar | "First, I haven't used the SPS30 so can't comment on specifics for those sensors. However, I have many years of experience working with aerosol meas..." | Read more » | about 5 years ago | |||
| warren | "OK, update - since the B sensor was covered yesterday, it's now showed as "downgraded" just as the A was yesterday: My question now, is apart fr..." | Read more » | over 5 years ago | |||
| warren | "OK! After now blocking the B sensor instead, it's accepting A data once more, and hasn't yet flagged the B sensor. Interesting! " | Read more » | over 5 years ago | |||
| warren | "Aha! One day later, my sensor A has been "downgraded"! I'll move the tape to the other sensor and see what happens. " | Read more » | over 5 years ago | |||
| warren | "i'll post more soon, but one is now totally blocked and it shows on the graph, but it's not rejecting the data. I'll let this run for a day. Then ..." | Read more » | over 5 years ago | |||
| warren | "OK, i covered it more thoroughly and will wait a while to report back on what happens. " | Read more » | over 5 years ago | |||
| warren | " OK testing this out now. Here's our sensor, on Cromwell St at our office: https://www.purpleair.com/map?582419|582421#13/41.81161/-71.41883 Note ..." | Read more » | over 5 years ago | |||
| warren | "This is great, thanks @kkoerner -- and interesting to see that they'll flag sensors. I wonder how much two would have to not correlate before it go..." | Read more » | over 5 years ago | |||
| kkoerner | "So from my experience they're used primarily as a sanity check. I'm not sure of the math behind it, and since PA removed the R2 values that used to..." | Read more » | over 5 years ago | |||
| warren | " @julieta @nanocastro have either of you used 2 sensors in your DIY #plantower -based devices? #maca etc? " | Read more » | over 5 years ago | |||
| warren | "And just linking to here, where the wiki page documents the 2 channels, which i would guess are from the 2 sensors? https://publiclab.org/wiki/purp..." | Read more » | over 5 years ago | |||
| warren | "@CBarnes9 @samr @Tomp @OrionAllgaier @wu_ming2 @guolivar @BrandonFeenstra @kkoerner, any thoughts or info to share on exactly what the #purpleair d..." | Read more » | over 5 years ago | |||
| guolivar | " The particle size distribution (mass, volume or number) is very variable and even though "on average" it's fairly stable, the day-to-day variabili..." | Read more » | over 5 years ago | |||
| warren | "Thanks for this! I guess you're also implying that the mass distribution also doesn't follow any simple or predictable trends? Like, is there no ge..." | Read more » | over 5 years ago | |||
| guolivar | "Short answer ... No. Long answer ... Absolutely no! I'll try to explain why, even though it sounds possible, the uncertainties are so large that t..." | Read more » | over 5 years ago | |||
| liz | "Hi @Tomp, and thank you for replying @jeffalk. Chiming in with a link to additional documentation that @jiteovien provided on another question: htt..." | Read more » | over 5 years ago | |||
| jeffalk | " @Tomp, I'm not sure I understand your question but "particle counters" are basically counting particles and converting the counts to densities. T..." | Read more » | over 5 years ago |