Author Topic: Barani pro passive shield  (Read 7965 times)

0 Members and 1 Guest are viewing this topic.

Offline jgentry

  • Forecaster
  • *****
  • Posts: 346
Re: Barani pro passive shield
« Reply #200 on: October 12, 2018, 12:26:39 PM »
Looks good, now for some reports on performance. I have been running my station on my rm young fars for the last few weeks comparing it to the pro shield and i just switched back to the pro yesterday. It looks like the pro can hold it's own against one of the better fars around. I think as we get later into the year and solar energy is less the fars is not going to be as important as it might be in the summer when solar heating is at max. The pro has been doing just fine in comparison and the main difference right now is the fars will show a higher temp  up to a degree higher and i think that is because the fars is more responsive to temp changes than the pro which is a little slower in response to quick temp changes. With just a little wind the pro has been running about a .5 degree lower than the fars and with no wind runs the same as the fars. This seems to be because of less solar heating this time of year and will be proved out as the next summer cycle comes along. Will just take time to get all the ducks in a row with this stuff.

I donít think any passive shield is going to beat a good FARS when there is very little wind. But I do think the Pro shield along with the 75 is a great investment for Davis users
Davis Vantage Pro2. SHT-75. WU: KXALJEMI2 & KALTHORS2. CWOP/APRS: C6353 & E6358

  

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 5440
Re: Barani pro passive shield
« Reply #201 on: October 12, 2018, 01:08:26 PM »
I'm seeing less need for FARS also as we are in fall mode even relative calm windless days. 

Randy

Offline jgentry

  • Forecaster
  • *****
  • Posts: 346
Re: Barani pro passive shield
« Reply #202 on: October 14, 2018, 05:20:54 PM »
Where my station is located (in an enclosed area) itís hard to say how good the pro shield is doing. There is another Davis station with the Barani Pro shield and a 75 sensor also located .8m from me. That stationís recorded highs are typically around 1-2į cooler than my highs.

But Iím thinking my station at my house deals with a lack of ďmixingĒ of the air during lighter wind days compared to most well sited stations. The result is typically warmer temps and higher DPs at times compared to other nearby stations.

But it does seems like the pro shield produces really good response time for temp and humidity readings. Iíve seen as much as .3į jump in temp and 4-5% in RH per update cycle. Then again, Iím sure part of that is due to the 75.
Davis Vantage Pro2. SHT-75. WU: KXALJEMI2 & KALTHORS2. CWOP/APRS: C6353 & E6358

  

Offline jgentry

  • Forecaster
  • *****
  • Posts: 346
Re: Barani pro passive shield
« Reply #203 on: October 14, 2018, 09:55:41 PM »
I will say that insects are still crawling on the shield like they donít give a flip. Lol
Davis Vantage Pro2. SHT-75. WU: KXALJEMI2 & KALTHORS2. CWOP/APRS: C6353 & E6358

  

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 5440
Re: Barani pro passive shield
« Reply #204 on: October 14, 2018, 10:18:26 PM »
I will say that insects are still crawling on the shield like they donít give a flip. Lol

Same here I had ants trailing on mine...
Randy

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 5440
Re: Barani pro passive shield
« Reply #205 on: October 15, 2018, 01:53:37 PM »
This is ugly what I'm seeing with the pro and standard shields over snow cover. Almost opposite of the claim of reducing solar glare off snow. This is full ground snow cover and blazing sunshine difference is both Meteoshields Pro running plus 3-4į F warmer than Davis FARS. This really is a head scratcher  #-o  why snow reflection is this bad with these shields.

I referenced the airport only mile away making sure something wasn't wrong with FARS thermometer and both reading the same 37į.
 [ You are not allowed to view attachments ]

 [ You are not allowed to view attachments ]
 [ You are not allowed to view attachments ]

Randy

Offline dendrite

  • Forecaster
  • *****
  • Posts: 360
Re: Barani pro passive shield
« Reply #206 on: October 15, 2018, 02:07:25 PM »
Wow...interesting. I guess when the albedo is that high with fresh snow cover it's like the sun is shining directly from the ground and upward onto the black underside of the plates.

Offline dendrite

  • Forecaster
  • *****
  • Posts: 360
Re: Barani pro passive shield
« Reply #207 on: October 15, 2018, 02:12:00 PM »
Actually your standard has all white plates, correct? Or did you paint the underside a flat black?

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 5440
Re: Barani pro passive shield
« Reply #208 on: October 15, 2018, 02:14:14 PM »
I painted the inside on standard flat brown to reduce glare.
Randy

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 5440
Re: Barani pro passive shield
« Reply #209 on: October 15, 2018, 03:30:37 PM »
Update shields are coming together and look normal again but most of snow cover is also gone. +1 on standard , + .5 on Pro. I'll have to see what happens next snow.
 [ You are not allowed to view attachments ]
 [ You are not allowed to view attachments ]
 
« Last Edit: October 16, 2018, 05:20:02 AM by ValentineWeather »
Randy

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 5440
Re: Barani pro passive shield
« Reply #210 on: October 15, 2018, 09:28:15 PM »
Sent Jan my concern about the snow reflection and all the data logger information plus timelapse when snow melted. You can see the shields come together after the melt on this graph.
 [ You are not allowed to view attachments ]
Randy

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 5440
Re: Barani pro passive shield
« Reply #211 on: October 16, 2018, 12:55:20 PM »
Jerry pointed this out in PM we may be looking at something different here because the Pro shield is especially protected with the inner black shield for this type of reflection and protection. I wish I would of had the 7714 going at same time. Next time I'll have in service and see if all passive shields react the same or just the Meteoshields.
Randy

Offline jgentry

  • Forecaster
  • *****
  • Posts: 346
Re: Barani pro passive shield
« Reply #212 on: October 17, 2018, 09:36:28 PM »
IMO: Itís false advertising from Barani to say that insects and spiders donít like your shield. Already had a spider built a web on the shield and laid some eggs on the black louver...
Davis Vantage Pro2. SHT-75. WU: KXALJEMI2 & KALTHORS2. CWOP/APRS: C6353 & E6358

  

Offline mauro63

  • Senior Member
  • **
  • Posts: 50
Re: Barani pro passive shield
« Reply #213 on: October 26, 2018, 10:02:34 AM »
My new fars radiation solar shield, is a modified version of davis 24h, inside use the same sensor used to test older version and perfectly alligned to meteoshield pro sensor
is installed from yesterday at 2 pm
hope you like  ;)

 [ You are not allowed to view attachments ]
 [ You are not allowed to view attachments ]
 [ You are not allowed to view attachments ]
 [ You are not allowed to view attachments ]

yesterday graph comparision, clear, low wind and about 550w/mq solar radiation

 [ You are not allowed to view attachments ]

Mauro

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 5440
Re: Barani pro passive shield
« Reply #214 on: October 26, 2018, 11:02:03 AM »
Did you include the insulating sleeve?


https://www.scaledinstruments.com/wp-content/uploads/2014/09/24hr_fars_Exploded_Diagram.pdf

 [ You are not allowed to view attachments ]
Randy

Offline mauro63

  • Senior Member
  • **
  • Posts: 50
Re: Barani pro passive shield
« Reply #215 on: October 26, 2018, 11:59:00 AM »
Did you include the insulating sleeve?


https://www.scaledinstruments.com/wp-content/uploads/2014/09/24hr_fars_Exploded_Diagram.pdf

 [ You are not allowed to view attachments ]

no randy, I did not do it, this is only first test, I think I will do a lot of improvement
Mauro

Offline mauro63

  • Senior Member
  • **
  • Posts: 50
Re: Barani pro passive shield
« Reply #216 on: October 26, 2018, 12:46:35 PM »
today we did not have a useful day, the sky was covered all day, so the differences between screens are canceled
however, below today's partial graph
Mauro

 [ You are not allowed to view attachments ]

Offline mauro63

  • Senior Member
  • **
  • Posts: 50
Re: Barani pro passive shield
« Reply #217 on: October 27, 2018, 03:57:49 PM »
Hi,
today was characterized by considerable changes in temperature due to the cloud cover at times and, sometimes,  intense sun, the difference in reactivity is remarkable, the extremes have been mitigated by the wind, constantly present throughout the day
next week I will start a new project, more accurate construction and better materials, especcialy regarding concentric tubes isolation
 ;)

 [ You are not allowed to view attachments ]

 

anything