liutyi.infoPortable CO2 meter and data logger with battery and good CO2 sensor inside.
The only really wrong thing about this device is it always show temperature higher than it is for about 2°C (for example 28.0°C instead of 26.0°C) and it is not something related to wrong sensor placement.
uHoo – most advanced air quality monitor, at least if consider a number of sensors. Including advanced sensor like CO, CO2, PM2.5, VOC, O3, NO2. And also traditional like temperature, humidity, and air pressure. Measurements look accurate enough.
The device does not have any local indicators. Not a single color LED to show air quality status. The only way it communicates with the world is Wi-Fi and mobile application. The application (v 3.8) or backend infrastructure that makes it work is unfortunately unstable. Also, an interface is poorly adapted to iPhone X.
uHoo is not portable due to many reasons like no local indication, no battery, need Wi-Fi (and new connection setup will take time).
One of the oldest devices I got for CO2 monitoring is AZ-7788 GreenDay. It is 4 years old now. The device is still good and accurate.
Used as portable mostly because it has an LCD and not require setup.
Yet another CO2 Meter. This model can operate from 4 AA batteries or from power supply 5v 0.5A MiniUSB. May be built on different sensors. My happened to be built on Sensair s8.
Yet another air quality monitor. Measure PM2.5 and CO2. Have a rechargeable battery that allows hours of work without a power plug. Have Wi-Fi and mobile application to access data.
What is wrong with this device – no support for Ukraine. No external Air quality data for Ukraine, cannot choose Ukraine from a country list during setup. It is also ambient light sensor missing (only manual screen brightness setup).
UPD from 2018-02: Now support Ukraine, but only two private external monitors available (in Kyiv and Brovary)
Awair. Air quality monitor. Measure Humidity, Temperature, CO2, VOC (Hydrogen gas, Hydrogen Sulfide, Ammonia, Ethanol, Toluene, Formaldehyde), Dust (PM2.5 PM10). That is somehow more than netatmo can do.
Device shows air quality metrics as a dot bars. Where one dot is good and five dot are bad. It is also general “Awair score” on the screen both by number (100 is best, zero is worst) and by color of the LED (green is good, red is bad).
Awair also can work as clock (but only in 12h mode).
In addition to local indication device is also send data to a cloud using Wi-Fi (802.11n 2.4GHz), that allow to see the data using iPhone or Android on a remote locations.
Relative Humidity Sensor. Detail in weather stations that live only about couple of years. It looks like:
Size may vary. It may have different number of black lines but it always work same way and got broken same way. Special coating on sensor getting old and disappear. When it happened there is always RH=20% on weather station display. Why not RH=0%? Because this type of sensors cannot measure RH lower than 20%. Therefore, when it got broken there is ~20% RH on display.
RH Sensor must be replaced to fix the issue.
Before RH Sensor replaced
After RH Sensor replaced
Urban Weather Station is unique product. In addition to usual weather parameters like temperature, humidity and pressure it also measures CO2 and noise level (indoor only). Outdoor air quality as well as weather forecast is showing from some internet weather sources and not based on measures done by the product. Actually everything that your iPhone, iPad or Android device show is downloaded from netatmo servers. You cannot access your weather station directly without internet connection. So setup of the station is actually simple and it is just create netatmo account and connect the station to Internet using Wi-Fi. Numbers, trends, forecast could be than obtain with app for iOS or Android from anywhere. Also web interface available, so PC and Mac are also could be clients for the weather station.
Netatmo stations have known bug with humidity measures. It show numbers 15-20% more than it actually should. But this could be fixes by contact-support@netatmo.com
The station contain CO2 sensor, which consume a lot of energy. That is why it cannot operate with batteries power and need to be connected to AC adaptor all the time.
New type of devices for desktop. Called Air Quality monitors. In addition to temperature and humidity it is also measure CO2 level.
device:
Interested in how CO2 sensor work? Read about NDIR types of sensors.
And what is ppm? it is acronym for parts per million