{"id":49654,"date":"2020-06-09T08:47:12","date_gmt":"2020-06-09T07:47:12","guid":{"rendered":"https:\/\/automatedhome.com\/?p=49654"},"modified":"2020-06-09T08:47:12","modified_gmt":"2020-06-09T07:47:12","slug":"review-aranet4-home-wireless-indoor-air-quality-monitor","status":"publish","type":"post","link":"https:\/\/automatedhome.com\/reviews\/review-aranet4-home-wireless-indoor-air-quality-monitor.html","title":{"rendered":"Review: Aranet4 HOME Wireless Indoor Air Quality Monitor"},"content":{"rendered":"\n

We’re always interested in Air Quality sensors and the latest one to turn up at the Automated Home is the Aranet4.<\/p>\n\n\n\n

This is the first domestic indoor air quality sensor from the sub-brand of the Latvian company SAF Tehnika. It measures Carbon Dioxide (CO\u2082), Temperature, Relative Humidity and Atmospheric Pressure.<\/p>\n\n\n\n

Display<\/h2>\n\n\n\n

The stand out feature of this device is its ability to show all its measurements on screen. Using tech similar to the Eve Room<\/a>, the display employs an e-ink screen which provides an informative, if a little small, panel of readings. <\/p>\n\n\n\n

The advantage of this type of display is its low power requirements and its high contrast is easily read if there’s good ambient lighting. The unit can sit on table or shelf, or be wall mounted if you prefer.<\/p>\n\n\n\n

Sensors<\/h2>\n\n\n\n

There’s no VOC or PM2.5 detectors here, but the on-board electronics use a special type of ‘NDIR’ sensor for CO\u2082 measurements…<\/p>\n\n\n\n

Aranet4 uses non-dispersive infrared (NDIR) sensor for measuring the CO\u2082 level. The device has a small gas chamber with infrared light source in which CO\u2082 absorbs the light. An optical filter in front of a detector then filters all of the light except the wavelength that the CO\u2082 molecules can absorb so a precise measurement of the CO\u2082 level can be made.<\/p><\/blockquote>\n\n\n\n

As well as the integer display the screen also shows a 3 colour traffic light system. The maximum indoor CO\u2082 level considered acceptable is 1,000 parts per million and the colours mean the following:<\/p>\n\n\n\n