Weather Station Hardware > Air Quality Sensors
Ecowitt WH41 - Calculations to take the humidity out
davidefa:
Very interesting reading ( need 'some' time to digest it ).
Only one point: they applied the correction to 24h mean values ( from a cursory reading ), I'd like to apply it also to 'instantaneous' values.
Another consideration: I underestimated the value of 24h mean values.
I mean till now I considered only peak values ( which are important ). I think I should pay more attention to total/integrated dust exposure ( sort of 'dust dosimeter' ) and evaluate both acute and chronic dust pollution
billfor:
Interesting, with my WH41 the humidity does not affect it as much as rain. Not sure how I could correct for that. We just had the hurricane run through here and it went bonkers.
ajay:
--- Quote from: billfor on August 23, 2021, 01:00:37 PM ---Interesting, with my WH41 the humidity does not affect it as much as rain. Not sure how I could correct for that. We just had the hurricane run through here and it went bonkers.
--- End quote ---
That is interesting. I wonder if you have the Honeywell sensor or the Plantower sensor. Mine works quite differently. Typically when it rains it drops the count down to practically nothing (which it should as the air gets washed out.) It's when visibility is reduced by thick fog that mine goes bonkers. We had a good soaking rain this morning and it was down to about 5ug/m3 with humidity at about 96-97%. Only with fog (99%) does it go up to above 60 ug/m3.
davidefa:
May these different behaviour connected to the sensor mounting ( for example under a large patio or inside a small solar shield )?
Mine is still inside ( home made pms7003 ), I'd like to mount outside but don't know where to position properly
billfor:
Support says "the tiny water droplets in the air works like a lens or mirror, and this can lead to the optical counting sensor showing a very high value. This is typical to such sensor. "
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