Different PM data with Nova and Plantower sensors

[unsermanninchina]

I had mentioned this problem in another issue. My problem is that SDS sensors and PMSA003 have a huge difference in their data. I was not sure if the A003 is different from the supported Plantower sensors and it is a three year old but never used sensor. For that reason I bought a new PMS7003 to try if it is different from the old one. But it shows almost the same PM data like the A003.

So now I have the problem that I have two SDS011 with lower PM and two Plantower A003/7003 with much higher PM levels. Looks like I have to choose to trust the Nova or the Plantower sensors, which at the moment is a difference like this example, picked up at the same moment:

SDS011 | PM2.5 | 12.3 µg/m³ SDS011 | PM10 | 22.7 µg/m³ and the 7003 with (PMSx003 | PM1 | 37.6 µg/m³) PMSx003 | PM2.5 | 42.0 µg/m³ PMSx003 | PM10 | 50.0 µg/m³

Both sensors placed on the same table and their air input with 6 cm distance. And for a lot more measurings show the same difference of about 3-4 times higher PM levels measured with the PMS sensors. The EPS8266 have all the same firmware. I gonna run them with debugging the next days, but @dirkmueller had looked at the A003 log a week ago and not found any hints That there is a problem with the firmware.

Until now I can only ask if other users have had similar problems or any idea what I could check. I must say, that I don't understand the programming of Arduino or ESP8266 until now, I have never tried it. I am not afraid to check anything if I know how to do it. Thank you to anybody in advance!

[zefanja]

Also related: https://medium.com/@pawitp/are-chinese-pm2-5-sensors-reliable-ec67a9e03f2f

The Plantower sensors are much more accurate - at least here in Asia.

[unsermanninchina]

Also related: https://medium.com/@pawitp/are-chinese-pm2-5-sensors-reliable-ec67a9e03f2f

The Plantower sensors are much more accurate - at least here in Asia.

Thank you for the information @zefanja . Yes, it looks like the same difference in the readings. I only use PMS 7003 and PMSA007 now. By the way, your Android sensor APP I will try, a very simple solution for a mobile sensor!

[M10CUBE]

i Hi @dirkmueller .Since you are sending data to opensensemap.org is by any chance to tell me what I did wrong and my sensor (SE0001) looks deemed there? I did everything by the book.

https://opensensemap.org/explore/60ad33976fedc6001b9e091d

Same sensor sending OK data to sensor.community https://maps.sensor.community/#16/39.3609/22.9697

Thanks a lot