Hi there,
I have two devices running one with the older 5003 which is connected to here and another with the newer A003 both sensors are in the same enclosure and give consistent data within 1ug. In the locality there are quite a few SDS011 sensors all of which are also consistent to within 1ug however the SDS011 are always substantially lower than my 5003 and A003 it can be that the SDS is reading 11ug while mine are reading 20ug. There doesn’t seem to be a real reason why all of them should be reading lower. I tried different enclosures and also no enclosure all in the same orientation and place. I am more inclined to “trust” my sensors because the increase in particulates anecdotally corresponds with increase in hay fever symptoms with my kids and the ads sensors do seem not to fluctuate hardly at all. Does anyone have any insights? All sensors are tagged as outdoor sensors. I am a little closer to the main road but the discrepancy is also present for example this morning (Sunday) with virtually no traffic. Thanks in advance!
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I have also been asking this question. By substantial difference are you finding the difference as large as 2x?
Yes that’s exactly what I see although I have not been able to find anywhere someone corroborating this evidence.
I will try and find my data but I think I have found approximately 2x difference between SDS011 and the sensor in the Atmotube system.
Sorry it took me a day or two to locate this data. Here we see the difference between my SDS011 and the Atmotube Sensiron SPS30.
[quote=“sensorsalnorth12, post:4, topic:2161, full:true”]
I will try and find my data but I think I have found approximately 2x difference between SDS011 and the sensor in the Atmotube system.
[/quote] That’s interesting to hear!
Yes, and the data presented above shows the difference is quite significant. It is my belief that the new batch of SDS011s give lower values than the older ones (I have posted previously about this) but all of my old ones have broken down, so I can no longer check this out. Of course the Atmotube system I used to compare the values could be in error but when I check the local annual averages for my city they give a value less than 5ug/m^3 where the calibrated official sensor is 3x higher!
