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cheap and effective FA radiation shield DIY
#11
Update...
Finally after a delay of a few months I installed my OP Fan Assisted shield in the garden.

It didn't take long to get results... My 20 year old Peet bros sensor, also in a radiation shield but NOT fan assisted wil be replaced ASAP...

The differences are much greater than expected:

Afternoon, sunny, but both sensors in the shade: FA shield: 20.3 Celcius, old sensor 25.5C
I checked the outside temp with my calibrated thermometer and the difference with the new FA sensor was 0.3C

The next morning was more surprising because the non FA shield had a chance to cool off:
new FA shield: 14.1C, old sensor: 20.2C !!

Wow, never expected that! 

I think in a domestic environment, a Fan Assisted shield is more useful. In open field there's more wind to blow through the non FA radiation shield. In a town garden the situation is much different.

Well, I'm very happy with the results...

NOTE: The Fan runs 24/7.
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#12
Congratulations!  Smile
Best Regards
Zdenek

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#13
(31-08-2019, 07:59)edr1924 Wrote: I think in a domestic environment, a Fan Assisted shield is more useful. In open field there's more wind to blow through the non FA radiation shield. In a town garden the situation is much different.

Hi edr1924,

Maybe you would like to read this:
https://www.meteocercal.info/forum/Threa...on-shields

Indeed, as the study shows, the lower the wind speed the more a fan assisted radiation shield is effective. In some places, is even a must.
MeteoCercal - Air Quality Data
Click here to watch at my ThingSpeak channel



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#14
(01-09-2019, 03:39)Werk_AG Wrote:
(31-08-2019, 07:59)edr1924 Wrote: I think in a domestic environment, a Fan Assisted shield is more useful. In open field there's more wind to blow through the non FA radiation shield. In a town garden the situation is much different.

Hi edr1924,

Maybe you would like to read this:
https://www.meteocercal.info/forum/Threa...on-shields

Indeed, as the study shows, the lower the wind speed the more a fan assisted radiation shield is effective. In some places, is even a must.

Thank you for that URL, very interesting and point proven in my case/location.

But that's also why the wireless WeatherDuino and Davis systems etc. are so great because one can place the sensors in the best location.

BTW: I asked in another post for the choice between Inspeed and Davis wind sensors.  I decided to retire the (superior) Peet Bros anemometer I use now and use the Davis 6410 as it is widely available and better serviceable with the new model.

Moving forward to an all WeatherDuino system which is great!
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#15
(02-05-2019, 14:08)hornychz Wrote: Hello,

Today I've received my new aspirated radiation shield - not DIY, but it made by professionals
from Hunan RIKA Electronic Technology:

[Image: IMG_20190502_142904-upr-sm.jpg]

I will change my old SHT21 sensor and my old DIY shield with this new one and SHT31
in the next weeks - I am already looking forward ...  Shy

You will find that the SHT31-D sensor accuracy is amazing...
Have fun with those great products...!
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#16
(01-09-2019, 08:01)edr1924 Wrote:
(02-05-2019, 14:08)hornychz Wrote: I will change my old SHT21 sensor and my old DIY shield with this new one and SHT31
in the next weeks - I am already looking forward ...  Shy

You will find that the SHT31-D sensor accuracy is amazing...
Have fun with those great products...!

Hi,

I have some, one of them more than 2 years, but the head one is still SHT21...
The change will be done maybe this october (because of care about our grandchildern...), I hope  Wink
Best Regards
Zdenek

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