Author Topic: WH40 vs WH40  (Read 1109 times)

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Offline Rover1822

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WH40 vs WH40
« on: November 01, 2020, 03:07:34 PM »
[Edit 11/13/2020 Please read my other post in this thread that shows virtually no large difference between the 2 WH40 units, well within the margin of error]


I know... reading the topic some may be asking, huh ? why?  Please understand this is more of a fun thing than a technical thing.

It's actually simple , I have 2 WH40s. One I got from Ecowitt, because I wanted to see how it worked. Then I bought the Ambient version to have that one work with my WS-2000 console.

I decided to make a side by side comparison. Now first off, I do not believe the results of this is because one came from Ecowitt, and the other from Ambient. Although the results are curious. I made a mount to have the 2 WH40s very close, separated by my Stratus. As seen in the image below (Please critique the arrangement). What I have seen is that the 2nd WH40 always reports lower (previous events), and usually same rough % difference.

I just had another rain event and this is the data. I would expect the side by side WH40's to report almost the same data. But as I have seen in previous instances with this exact combination one reads lower. The numbers are from GW1000s with the same (1.6.3) firmware.

(1) GW1000 #1 , WH40#1 (Ecowitt) , 0.45"
(2) GW1000 #2 , WH40#2 (Ambient),  0.36" (The WS-2000 reports the same number)
(3) Stratus manual, 0.43"

 I would not expect that much of a difference. (I'm not trying to compare to my WH65 that reported 0.55" for the event on another GW1000 , as it is at a different area on my property). But for those following the WH65 vs WH40 thread, well even multiple WH40s don't agree (and probably multiple WH65's). I will continue to monitor , and probably apply offsets after some number of repeated events.

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« Last Edit: November 13, 2020, 11:17:17 AM by Rover1822 »
Ambient:
  WS-2000
  PM 2.5(2)
  WH31B(2)
  WH40E
  WH31P
EcoWitt:
  GW1100
  GW1000(4)
  WH31(2)
  WH57
  WH51(12),
  WH40
  WH5360B
  WN34S
  WittBoy WS90 + GW2000
  WS90 (other one) + GW1100
Personal Sites: Weather Cam

Offline galfert

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Re: WH40 vs WH40
« Reply #1 on: November 01, 2020, 04:37:57 PM »
Here is my recommendation  :grin:


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Ecowitt GW1000 | Meteobridge on Raspberry Pi
WU: KFLWINTE111  |  PWSweather: KFLWINTE111
CWOP: FW3708  |  AWEKAS: 14814
Windy: pws-f075acbe
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Offline galfert

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Re: WH40 vs WH40
« Reply #2 on: November 01, 2020, 04:43:39 PM »
Actually my real recommendation is that I think you need more separation. You could be causing bounce out into the Stratus.
Ecowitt GW1000 | Meteobridge on Raspberry Pi
WU: KFLWINTE111  |  PWSweather: KFLWINTE111
CWOP: FW3708  |  AWEKAS: 14814
Windy: pws-f075acbe
Weather Underground Issue Tracking
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Offline Rover1822

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Re: WH40 vs WH40
« Reply #3 on: November 01, 2020, 05:24:43 PM »
lol :)
Ambient:
  WS-2000
  PM 2.5(2)
  WH31B(2)
  WH40E
  WH31P
EcoWitt:
  GW1100
  GW1000(4)
  WH31(2)
  WH57
  WH51(12),
  WH40
  WH5360B
  WN34S
  WittBoy WS90 + GW2000
  WS90 (other one) + GW1100
Personal Sites: Weather Cam

Offline CW2274

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Re: WH40 vs WH40
« Reply #4 on: November 01, 2020, 05:42:16 PM »
Actually my real recommendation is that I think you need more separation. You could be causing bounce out into the Stratus.
Agreed. Whether it'll help... The shallow walled bucket design is not the greatest IMO, especially in a heavier event. 

Offline Rover1822

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Re: WH40 vs WH40
« Reply #5 on: November 01, 2020, 05:52:08 PM »
If this were one event, yes. But one (always the same one) is always less than the manual by a fair margin.

Don't read too much into it.  I'm just showing the variability of the same model.

Ambient:
  WS-2000
  PM 2.5(2)
  WH31B(2)
  WH40E
  WH31P
EcoWitt:
  GW1100
  GW1000(4)
  WH31(2)
  WH57
  WH51(12),
  WH40
  WH5360B
  WN34S
  WittBoy WS90 + GW2000
  WS90 (other one) + GW1100
Personal Sites: Weather Cam

Offline Rover1822

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Re: WH40 vs WH40
« Reply #6 on: November 02, 2020, 02:35:22 PM »
You know you may have a problem when you have something like this... :)

 [ You are not allowed to view attachments ]
Ambient:
  WS-2000
  PM 2.5(2)
  WH31B(2)
  WH40E
  WH31P
EcoWitt:
  GW1100
  GW1000(4)
  WH31(2)
  WH57
  WH51(12),
  WH40
  WH5360B
  WN34S
  WittBoy WS90 + GW2000
  WS90 (other one) + GW1100
Personal Sites: Weather Cam

Offline Jai Soone

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Re: WH40 vs WH40
« Reply #7 on: November 03, 2020, 03:55:35 AM »
Swirling wind around your house and fence could be a problem. After awhile, swap the two WH40s with each other to see if the difference tracks with individual sensors or with position.

Offline Rover1822

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Re: WH40 vs WH40
« Reply #8 on: November 13, 2020, 09:14:19 AM »
OK, I had a rain event that lasted about 36 hours and deposited over 6 inches of rain.
Based on the data, I don't see any meaningful difference between the 2 WH40s. I think it is now pointless for me publish future comparisons between these 2
The 2 WH40s also don't show any meaningful difference when compared to the Stratus manual gauge
There is the consistent difference between the WH40s, Stratus and the WH65, but the WH65 is located on the other side of my house and higher. I now always see a ~20% higher value for the WH65, regardless of where I place the WH40s. I still feel the WH65 just reads higher and is less accurate.

Final data.
Ambient WH40    6.0 inches
Ecowitt  WH40    6.13 inches
Stratus              6.19 inches   *Note, that this number probably has error due to having to decant to measure totals but should be close
WH65               7.46 inches

 [ You are not allowed to view attachments ]
Ambient:
  WS-2000
  PM 2.5(2)
  WH31B(2)
  WH40E
  WH31P
EcoWitt:
  GW1100
  GW1000(4)
  WH31(2)
  WH57
  WH51(12),
  WH40
  WH5360B
  WN34S
  WittBoy WS90 + GW2000
  WS90 (other one) + GW1100
Personal Sites: Weather Cam

Offline Goldguru

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Re: WH40 vs WH40
« Reply #9 on: November 16, 2020, 11:41:31 PM »
Thnx on initial testing my error appears to be 10% of expected (short)
I'll begin a new thread on explaination.

Offline giusCB

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Re: WH40 vs WH40
« Reply #10 on: December 26, 2021, 05:03:40 PM »
The correct resolution for the WH40 is 0.1022mm (with original setting it underestimate by -2.2%) The wh65, overestimate by +25% (0.254mm every tip should be ok)
Try with these offset  [tup]
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