Categories
air quality

Air Mentor 2s

Multi-sensor (CO2, PM2.5, TVOC, HCHO) air quality monitor with Bluetooth and Wi-Fi.

Applications are available for iPhone, iPad, Android phones.

Air Mentor 2 iPad application

By its design Air Mentor is not a portable IoT device. It has no battery. It has no display. So it is an alternative to uHoo (and to some extent to Netatmo). If compare Air Mentor 2s to uHoo: Air Mentor 2s have HCHO sensor. But uHoo measures CO, O3, NO2, pressure instead. Netatmo is actually a weather station with an external t/RH sensor, that also measures air quality by CO2 parameter only. Air Mentor 2s got a more expensive CO2 and t/RH sensors than both Netatmo and uHoo.

Temperature and Humidity sensor (SHT30) is both good itself and placed correctly on the bottom of the device with some gap from the mainboard. More or less as it is recommended by the Sensirion guide.

There are some issues with the current versions of mobile applications. For example, you cannot connect the device to Wi-Fi access points using iOS devices (it works using the Android version). Russian localization is not complete. Trend data from cloud not always loading (for both iOS and Android).

Categories
air quality

D9 Air Quality Detector

This time OCRKJ D9-H. Which also can be found in some shops as unbranded LCD Digital Air Quality Monitor (AKA monllac, AgoHike, Robincure). Similar to OCRKJ K6-D from the previous review. It was bought for about 100$. Yet another portable device with 10 hours battery life and correct CO2 measurements.

D9 Air Quality detector

Pros

  • 3000 mAh battery ( 10 hours of battery life)
  • additional sensors (HCHO, VOC and PM2.5)
  • 16 different screens including trends
  • Active airflow with the relatively quiet fan
  • quality design and schematic inside (no glues, connectors, replaceable sensors)
  • good CO2 sensor inside – SenseAir S8 LP

Cons

  • slow charging – 8 hours (in operation mode)
  • no connectivity (Bluetooth, wi-fi, USB mass storage)
  • no ambient light sensor
  • unconfigurable high CO2 limits (GOOD is up to 1000 ppm)
  • wrong temperature and RH measurements (+3C, -10%RH)

It looks like relatively cheap SHT20 temperature and humidity sensor inside make it sort of a lottery if you will get correct measurements or not.

See device insides: https://wiki.liutyi.info/display/CO2/D9+Inside

SALE Price was: 102$

Categories
air quality

K6 Air Quality Detector

I was not expecting much ordering KKMOON K6 (and receiving actually OCRKJ K6). Which also known as CAFU K6. Because most of the portable air quality monitors I got before have at least one major issue with measurements (AiRead M3 – all measurements wrong, HT-501 – wrong temperature, AirRadio A6 – issues with CO2 measurement after outdoor use and wrong humidity measurements). AirVisual Node was the only exception that both portable and show correct numbers. But it just too big to put it in your pocket. So there was a long history of portable CO2 monitors with issues. And it was kind of a surprise that device I bought for 83$ is both portable and display correct numbers.

OCRKJ K6 Air Quality Detector

Pros

  • 3000 mAh battery ( 10 hours of battery life)
  • additional sensors (VOC and HCHO, PM2.5)
  • correct t, RH and CO2 measurements (not sure about other)
  • 16 different screens including trends
  • Active airflow with the relatively quiet fan
  • quality design and schematic inside (no glues, connectors, replaceable sensors)
  • good CO2 sensor inside – SenseAir S8 LP

Cons

  • slow charging – 8 hours (in operation mode)
  • no connectivity (Bluetooth, wi-fi, USB mass storage) – nothing
  • no ambient light sensor
  • unconfigurable high CO2 limits (GOOD is up to 1000 ppm)

See device insides: https://wiki.liutyi.info/display/CO2/K6+Inside

SALE Price was: 83$

Categories
air quality

Awair 2

Awair 2-nd edition is a better version of Awair, that fix some known issues of first edition

Awair 2
Awair 2-nd edition

What was fixed and added

  • 24h time format
  • USB Type-C standard 5v power connector
  • USB 5v 2A standard power supply
  • Better display (resolution, no backlight)
  • Ambient light sensor (display auto brightness)
  • Microphone (not sure if it is good to have it on IoT device)
  • Better PM2.5 sensor
  • New buttons to switch the display mode
  • Better wireless connectivity (new antennas)
  • Better (active) airflow
Categories
air quality

uHoo

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.

uHoo and iPhone

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).

Categories
air quality

AirVisual node

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)

Categories
air quality

Awair

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.

Awair

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.