Recommend Air Quality Meter
Are there ones that's accurate enough to tell the differences?
Aug 16th, 2016 2:32 pm
Aug 16th, 2016 3:28 pm
Aug 16th, 2016 5:21 pm
Thanks.bubuski wrote: ↑Aug 16th, 2016 3:28 pmI can't think of a do it all Air Quality Meter that hit all your points. Acurite, Netatmo and Elgato all have modules that hit some of your points but they are weather stations first.
Most are able to log time of the day, wind direction but unable to log ppm or traffic(vehicle congestion??). They can tell you the AQHI for your area.
Most are able to log time of the day, ppm (VOC), ppm (C02 build-up), ppm (CO) but are unable to log traffic(human occupancy) or the effectiveness of the central air vs dedicated HEPA filtration. You should be able to manually monitor run time of central air or dedicated HEPA filtration and cross reference date/time with the ppm reading.
Aug 22nd, 2016 11:50 am
Aug 22nd, 2016 5:04 pm
Sep 28th, 2017 5:37 pm
Oct 3rd, 2017 12:21 am
Oct 3rd, 2017 12:53 am
Any links to how the PMS5003 item was DIY'd? I was considering buying a PMS7003 but would want a quick DIY for itrf134a wrote: ↑Oct 3rd, 2017 12:21 amSKT air cube C: discontinued use due to highly inaccurate Sharp GP2Y sensor
Uhoo: WAAAY too expensive. US$299 + C$60 in duties. Sharpy GP2Y algorithm is different from the air cube but still vastly inaccurate. No corrections for any measurement, so barometric pressure is the same as a Cat 4 hurricane all the time. Nice graphs, wifi connectivity, etc.
Some home made thing from Taobao. Surprising, uses the most accurate sensors available (sht20 temperature and humidity sensor, Plantower PMS5003 dust sensor). No known connectivity, but is very accurate. It's plugged in all the time at work. It had a reading of 153 during the BC wild fires and normally reads 0 or 1 at work.
Oct 3rd, 2017 2:28 am
The "diy" meter can be purchased at wclh.taobao.com. There's a newer version with a CO2 detector or tvoc detector. Just be warned that the site will crash Firefox and has some weird audio coming from it. On the back of the unit, there's a uart port, so if you know anything about the AVR processor or have access to a scope, you can probably hook something up to it.engineered wrote: ↑Oct 3rd, 2017 12:53 amAny links to how the PMS5003 item was DIY'd? I was considering buying a PMS7003 but would want a quick DIY for it
https://www.aliexpress.com/store/produc ... 09733.html
Then there's this Blueair Aware Wi Fi Air Quality Monitor for $205 that looks promising and the price is good compared to amazon.com
Oct 3rd, 2017 12:45 pm
Thanks for the info. I'd much prefer an internet connected and ready to go device, but if none of them are reliable I would have to give and build an arduino/Pi device.rf134a wrote: ↑Oct 3rd, 2017 2:28 amThe "diy" meter can be purchased at wclh.taobao.com. There's a newer version with a CO2 detector or tvoc detector. Just be warned that the site will crash Firefox and has some weird audio coming from it. On the back of the unit, there's a uart port, so if you know anything about the AVR processor or have access to a scope, you can probably hook something up to it.
I was going to buy the Blueair but there's no objective measure of the device. It doesn't tell you which sensors it uses. It claims to measure dust, dander, pollen, mould, bacteria, and viruses, which is basically impossible. The most advance dust sensor is a Mitsubishi dust sensor that just came out this year, so it can't be used in this 2 year old device. The Blueair just throws up too many red flags to be reliable.
Oct 4th, 2017 1:12 am
Oct 4th, 2017 1:53 pm
I'd like to monitor PM2.5, but ideally also CO2, VOC, etc. at home and at work. I don't need a lifestyle device, I prefer technical info, even if it has no connectivity. At least I can look at it when I want to, but would prefer the ability to have it logged.rf134a wrote: ↑Oct 4th, 2017 1:12 amThe big question is: What do you want it to do? Right now, these devices can be separated into measurement devices and lifestyle devices. The WCLH device is a measurement device. Everything else is a lifestyle device. They concentrate more on dumbing down everything into a colour or number. If a device doesn't tell you which sensor it uses, it's a lifestyle device that distills what the maker thinks is important down to 3 basic colours or whatever basic metric they decide to use.
The other issue is that there's no way for your average consumer to measure or compare most measurements. Only PM2.5, temperature, humidity and barometric pressure are easily comparable, everything else is fluff since it's highly unlikely your average Joe will have any other kind of device to compare measurements against.
Foobot has very bad reviews on amazon and the creators have a really bad attitude against their own customers. I don't know enough about the Awair to make a comment other than they don't tell you what sensor they use.
The laseregg 2+ seems to have been upgraded by changing the $6 Sharp GP2Y to a $30 Plantower sensor. The specs of 0-999ug, 0.3um, and counts of up to 65536 are a giveaway. The sensor source is using fancy foreign names to market to name-sensitive Chinese customers. The actual sensor is only good for measuring CO2 from 400-2000ppm. The sensor then interpolates the tvoc with a minimum sensitivity of 125ppb, which is quite high. Here's the datasheet if you care:
https://www.digikey.ca/product-detail/e ... ND/5117222
Here's the current readings from my uHoo. Many sensors is not a good thing, it should only measure what you need. Since most of the devices are meant for use in Asia, they may measure things we have no use for. For example, any non-zero value for CO is considered to be unacceptable in Canada.
The price on the WCLH unit continues to impress me. It's probably my next unit despite having no connectivity. For (my) reference:
SenseAir S8 CO2 sensor: https://www.co2meter.com/products/s8-mi ... 2-sensor-1
Telair T6317 CO2 sensor: https://www.digikey.ca/product-detail/e ... ND/5027891
HCHO sensor: Dart 2FE5: https://www.dart-sensors.com/product/ec ... de-sensor/