New Device; Inaccurate readings?

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  azbraven

  Posted: 22.12.2024 21:29

  Modified: 17.01.2025 10:08

  Hi. I just got my new Aranet4 yesterday and find the readings don't make sense.  I have the device in my bedroom.  Overnight, while sleeping with the door and window closed, the readings were between 1244 to 1458 (seemed to fluctuate whenever the heat came on).  This morning, when I originally opened my window, the reading dropped to a low of 960.  But, an hour later, with my window still open, my reading is back to 1246.  How is it possible the reading is the same with door and window closed as it is with door and window open? (Edited to add: when I moved the device direclty under my open window, the reading dropped to 467, but then went straight back up to 1203, even though it is essentially outside).  I live in a rural area (air quality is great).  Is something wrong with my device?   How can I be sure the reading is accurate when the numbers make no sense?  Thanks 
• 

  aranet-techsupport

  Posted: 23.12.2024 09:41

  The actual reading may depend on many aspects, including airflow, sources of CO2, etc. Also, make sure to keep sensor in one place for at least 10min for accurate reading.

  To make sure readings are accurate, you can perform manual calibration:

  https://forum.aranet.com/all-about-aranet4/how-can-i-calibrate-my-aranet4/

   
• 

  azbraven

  Posted: 23.12.2024 23:29

  Modified: 23.12.2024 23:35

  Thanks for your reply.  I did recalibrate it, putting it on manual and then setting outside for an hour.  The number dropped to 442.  I brought it back to my bedroom, window closed, and it jumped to 1443.  I let it sit for an hour, then opened the window.  5 hours later, it's at 1463 (worse with window open).  It makes no sense.  Shouldn't open windows postively affect C02 levels, even only slightly?  I feel like either the device I got is a dud/doesn't work properly, or the product itself is worthless.  I understand that it may not be 100% accurate, but to barely budge while windows are open for hours (and actually get worse) doesn't make sense.  Thanks for any help.
• 

  aranet-techsupport

  Posted: 24.12.2024 10:35

  Thank you for your follow-up and for providing detailed observations about the readings. I understand your concern, and I’d like to assist you further in resolving this issue.

  As mentioned previously, CO2 readings indoors can depend on several factors, including airflow dynamics, room size, and nearby CO2 sources (e.g., people, heating systems, or even outdoor conditions if airflow is restricted). While opening a window would usually reduce CO2 levels, it’s possible that airflow in your room is insufficient to bring in enough fresh air, especially if there’s limited cross-ventilation or other factors affecting circulation.

  Here’s what I recommend to further investigate this:

  1. Test in Another Location: Try using the device in a different room or area of your house with different airflow conditions to see if the behavior changes.

  2. Test with Another Device (if available): If you have access to another CO2 measuring device, compare the results. This will help determine whether the issue is with the device or the specific environment.

  3. Monitor Outdoor Readings Again: Place the device outdoors in an open area for an extended period (e.g., at least an hour) and observe if the readings remain stable. If they fluctuate significantly, this could indicate a device issue.

  If you have followed all of these steps and still feel the device may not be working as expected, we completely understand your concern. In that case, you can initiate a repair or replacement process through our returns form:
  https://rma.aranet.com

  We are committed to ensuring you have a product that meets your expectations. Please don’t hesitate to reach out again if you have further questions or need assistance.

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