Author Topic: Barani pro passive shield  (Read 24050 times)

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Offline ivano

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Re: Barani pro passive shield
« Reply #525 on: January 08, 2021, 08:26:47 AM »
hi, after many tests with my meteshield pro and sht35 EP sensor, the optimal position for the sht35 probe is this

Thanks for that! What kind of material did you use to extend the length of the probe body?
i used a piece of a carbon fishing rod, but you can use a pvc pipe the diameter of the sensor base
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Offline Julius

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Re: Barani pro passive shield
« Reply #526 on: January 08, 2021, 02:50:37 PM »
My assumption is that adding the SHT35 probe (https://nl.aliexpress.com/item/4001220756351.html?spm=a2g0s.9042311.0.0.70234c4dEBTHiQ) will see the same results in a second Barani shield I added.
Did you add this sensor directly to your Davis VP2 base? Interesting ali link you've posted there.

Offline hmderek

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Re: Barani pro passive shield
« Reply #527 on: January 08, 2021, 03:19:13 PM »
My assumption is that adding the SHT35 probe (https://nl.aliexpress.com/item/4001220756351.html?spm=a2g0s.9042311.0.0.70234c4dEBTHiQ) will see the same results in a second Barani shield I added.
Did you add this sensor directly to your Davis VP2 base? Interesting ali link you've posted there.

No the sensor is connected to custom setup with a Wemos microcontroller. (Inside the box next to the left of the Davis Rain collector)

Offline hmderek

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Re: Barani pro passive shield
« Reply #528 on: January 09, 2021, 11:07:42 AM »
This should work.:-)

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Offline vsakalis

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Re: Barani pro passive shield
« Reply #529 on: January 13, 2021, 10:16:03 AM »
Hello to everyone

During my 2 yeas of scientific researtch in passive radiation shields,  I want to put into conversation some desigh parameters which I thing they are very interesting:
1. The time constant of the temperature devices which is very important and differs when several coatings of the sensor are used
2. The performance of the radiation shield/temperature sensor under low wind speed (less than 1 m/sec)
3. The position of the sensor inside the shield
4. The material of the shield (ABS plastic, PVC, HDPE...), affects the performance especially during the night when long wave radiation is important

Generally speaking, as a results from my experience, the test periode of the radiation shields performance must be more than 1 month and at least with 5 min time intervals. This month couldnot be the only June or December, preferable the period between May and September.
Mean temperature error, mean absolute  error and root mean square error during this period must be calculated in order to check the performance. In addition, the difference between max, min and average temperature could be one more option. All these parameters need a more accurate reference temperature device, which must be of course arificially ventilated.
And something more...dont forged the need of calibration of the devices owing to the drift of the sensor!

Offline galfert

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Re: Barani pro passive shield
« Reply #530 on: January 13, 2021, 10:41:46 AM »
My assumption is that adding the SHT35 probe (https://nl.aliexpress.com/item/4001220756351.html?spm=a2g0s.9042311.0.0.70234c4dEBTHiQ) will see the same results in a second Barani shield I added.
Did you add this sensor directly to your Davis VP2 base? Interesting ali link you've posted there.

It would be nearly impossible to add the SHT35 to the VP2 because the SHT35 only comes with I2C bus protocol version and the VP2 does not support this. The VP2 uses the SHT31 because it is available in LSS (Lagacy Sensiron Sensibus) version. The SHT31 also comes in I2C version. Therefore the VP2 is limited to no better than the SHT31.
« Last Edit: January 13, 2021, 10:44:12 AM by galfert »
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Offline hmderek

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Re: Barani pro passive shield
« Reply #531 on: January 14, 2021, 05:31:30 AM »
Well it definitely looks like adjusting the placement of the sensor has had desired effect. Of course I'll have to wait until summer to see how it really fares, but the jumps in temp under solar radiation spikes are gone for the SHT35. :-)

Offline Marty

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Re: Barani pro passive shield
« Reply #532 on: January 22, 2021, 11:56:22 PM »
This should work.:-)

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Is that 1/2 " pvc  pipe  ...

   Just installed my Meteoshield Pro with Ecowitt 32wh-ep sensor   and i have to say comparing this to a converted and painted inside flat black vp2 24h  newer year old sht 31 sensor    is   that right of the bat 10%  Humidity difference  at peak but overall all day is around 7%..
 As far as Temp very quick response with  Pro shield compared to Davis but as 40 Latitude there is very littles sun now.  High temp .5F lower on pro  but was the    same for low   for 1 day comparison ...

Just checked Barani web site and sensor placement is 7.5cm  +-2.5cm  so around 3+ inches from base
« Last Edit: January 23, 2021, 12:06:48 AM by Marty »

Offline CW2274

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Re: Barani pro passive shield
« Reply #533 on: January 23, 2021, 12:19:39 AM »
This should work.:-)

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comparing this to a converted and painted inside flat black vp2 24h 
This is not meant as a criticism, my VP2 has modifications as well, but the 24hr VP2 shield is patented. The sensor chamber has the large, black disc at the bottom for this purpose. Do you feel your mod is necessary/beneficial over stock?

Offline Marty

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Re: Barani pro passive shield
« Reply #534 on: January 23, 2021, 02:25:34 PM »
This should work.:-)

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comparing this to a converted and painted inside flat black vp2 24h 
This is not meant as a criticism, my VP2 has modifications as well, but the 24hr VP2 shield is patented. The sensor chamber has the large, black disc at the bottom for this purpose. Do you feel your mod is necessary/beneficial over stock?


No worries ,   My vp2 is total Frankenstein  started as standard vp2 then added daytime fars and ended up with 24h conversion ...

and its for sale ,   best offer 

20201224_112231 by Marcin Madry, on Flickr

 

anything