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Weather Station Hardware => Ambient Weather and Ecowitt and other Fine Offset clones => Topic started by: Platokidd on February 09, 2023, 06:30:36 AM
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Interesting the data is so far off from each other. The 3 sensors are indoors and about 6 inches apart.
Probably low-end quality?...
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what happens if you calibrate one of the WH41/43 to the same level as the WH45 - and see if the discrepancy remains so big ?
Maybe they only need the same baseline ....
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Calibrate, I'm holding that thought for a little while..
CH1 is an Ecowitt WH42 outdoor with the Honeywell and fan.
Ch2 is an Ambient model, Honeywell and fan. (wh42 I would assume)
Ch3 is an Ecowitt WH41 outdoor brand new out of the box. This model has no fan that I can see. Not sure how I would clean it.
AQI combo is an Ecowitt WH5. About a year old.
All 4 now are on a table about 5 inches apart.
I have another WH45 that's boxed till my campground opens. Would expect more of the same.
It's mind blowing to see the readings far apart. Leads me to think they're just numbers.
Now what unit to use as baseline.....
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Update: CH2 (amb) my oldest pm2.5 and the new ecowitt wh41 (CH3) have moved closer.
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Interesting, My 2 AmbientWeather (marked as wh42B indoor/outdoor), which I believe at the time , were the same as the Ecowitt WH41 with honeywells, track close to each other. These as the outdoor models have the slower reporting
I am also interested in in how you are doing your testing, what is the environment?, I really don't want to hang out there :)
If you put them in a "cleaner" environment , how do they compare ?
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Has been reported that these sensor use different pm sensors ( honeywell, plantower, sensirion ), not sure how the 'compare'... but first of all leave that room as soon as possible!
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Okay I have moved them. See numbers below. The 2 Honeywell's read fairly close(ch1 &2) The combo and the new ch3 are total different type of set-up / sensor. They also match well. Identical now as I'm typing.
Guessing they all read drastically different as things change for the worse.
Thanks!
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I was going to comment on the two outdoor units I have compared to the AQI combo. But before I got to do that, I noticed the two outdoor units (using different sensors) are very far apart at times. My gut is telling me the differences relate to the time of day and when the solar panels have sun on them. They sit right next to one another.
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My WH41 and WH45 have different readings but are 'close enough' in my determination. Typically within 2-5 µg/m3 from each other at the low end. The WH41 was outside since I bought it, even with cleaning I could not get it to match exactly. WH45 stayed inside virtually all the time. Overall, the data trends are very similar when put them side-by-side.