Aranet4 HOME

A CO₂ monitor measures indoor carbon dioxide concentration in ppm (parts per million). CO₂ levels are commonly used as an indicator of ventilation effectiveness. Rising indoor CO₂ levels may signal insufficient air exchange in homes, offices, or classrooms.

Outdoor air typically contains around 400–420 ppm of CO₂. Indoor levels vary depending on occupancy and ventilation.

• 400–800 ppm: Well ventilated
• 800–1200 ppm: Moderately elevated
• 1200+ ppm: May indicate insufficient ventilation

CO₂ is not toxic at typical indoor levels, but high concentrations can indicate poor air exchange.

Aranet4 HOME uses a true non-dispersive infrared (NDIR) sensor to measure CO₂ directly. Unlike estimated “eCO₂” devices, NDIR sensors detect actual CO₂ molecules, providing stable long-term accuracy.

The device supports automatic background calibration in regularly ventilated spaces. For best accuracy, periodic exposure to fresh outdoor air is recommended.

The buzzer activates when CO₂ levels exceed a user-defined threshold. The default alert level can be adjusted in the Aranet Home app.

No. Aranet4 HOME measures carbon dioxide (CO₂), not carbon monoxide (CO). A dedicated CO alarm is required for carbon monoxide detection.

Aranet4 sensor must be within Bluetooth range to change settings within the app. If the sensor is within Bluetooth range, you can try changing the warning thresholds to custom settings (e.g., 300 ppm for yellow; 400 ppm for red, so it beeps if it is lost somewhere with fresh air). Alternate the buzzer between 'Off' and 'On Every Time' to create beeps.

If switched on, the buzzer emits a sound when the CO₂ concentration reaches the red threshold, which is set by default to 1400 ppm. To change it, follow these steps:

1) Open your Aranet4 app;

2) Click on the 'Gear' icon in the top right corner;

3) Select 'Warning thresholds' under 'Advanced';

4) Choose 'Custom' and change the thresholds as desired.

To set up a buzzer, follow these steps: 1) Open your Aranet4 App; 2) Click on the “Gear” icon in the top right corner; 3) Select 'Buzzer' and choose 'On, once' or 'On, every time' depending on your preference.

We use DPD and DHL Express for deliveries within Latvia and the EU, DHL Express for global deliveries, and FedEx for shipments to the United States. We do not ship sensors to PO boxes; however, if your purchase consists only of stickers, they can be delivered to PO boxes.

High CO₂ levels can negatively affect your well-being, comfort, and productivity. For example, if CO₂ levels reach 1000 ppm, your cognitive abilities drop by 15%. At 1400 ppm and above, they decrease by a staggering 50%. Additionally, CO₂ monitoring helps to prevent the spread of COVID-19, as CO₂ level is a good proxy for airborne infection risk.

Aranet4 uses a non-dispersive infrared (NDIR) sensor to measure CO₂ levels. The device features a small gas chamber with an infrared light source, where CO₂ absorbs the light. An optical filter in front of the detector then filters out all light except the wavelength absorbable by CO₂ molecules, enabling a precise CO₂ concentration level measurement. This CO₂ reading method offers higher precision than regular electro-chemical sensors, as it uniquely detects carbon dioxide with no interference from other gases. Furthermore, the NDIR sensor has a much longer lifespan and requires less recalibration than other sensors.

Aranet4 is calibrated at the factory, so if you’ve just received your new device, there is no need to calibrate it immediately. We recommend calibrating Aranet4 once a year.

Aranet4 can be calibrated either automatically or manually at home. In automatic calibration mode, the Aranet4 device needs to be exposed to fresh air with approximately 420 ppm of CO₂ (for example, outdoors or in a room with very good air exchange) for about 8 hours during each 30-day operation period.

For manual calibration, the Aranet4 device must be exposed to fresh air (around 420 ppm of CO₂₎, such as in a forest. The environment should be stable (unchanging) for 30 minutes during the calibration. Maintain a distance of at least 1 meter from the device during the calibration process to ensure the CO₂ from your breath doesn’t affect the calibration. To initiate manual CO₂ calibration, change the 1st switch position at the back of the device, behind the batteries, from MANUAL to AUTO and back to MANUAL, keeping a maximum of 1 second between each movement. The batteries must be installed in the device. The calibration progress will be displayed on the device’s screen.

For a reference background CO₂ level, please check a global outdoor CO₂ level map. Manual calibration can also be performed using Aranet Home app. Instructions for manual calibration via the app are available in the Aranet4 Calibration Tutorial.

All purchase orders are processed within two working days from the order date.

Indoor humidity levels should range from 30% to 50%. This range supports comfort, health, and helps prevent the growth of mold.

Simply go into your Aranet Home App, and tap onto the dashboard view in the top right corner. Once there, tap on the “Sharing” icon in the top right corner and choose how you would like to share or download it.

You can extend the warranty of your Aranet HOME products by an additional 12 months by registering the product and agreeing to receive email updates from SAF Tehnika. You can withdraw your consent to receive emails anytime without affecting the extended warranty.

Due to regulations of the European Union and Latvia, there are restrictions for delivering products to certain territories and countries. Please contact us at sales_support@aranet.com for specific information regarding your location.