Author Topic: AC Case fan for 24 HR Davis FARS shield mod recommendation requests  (Read 2199 times)

0 Members and 1 Guest are viewing this topic.


Offline CW2274

  • Forecaster
  • *****
  • Posts: 6063
    • Conditions @ CW2274 West Tucson-Painted Hills Ranch
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #51 on: November 08, 2021, 08:59:53 PM »
Nope.

Offline CW2274

  • Forecaster
  • *****
  • Posts: 6063
    • Conditions @ CW2274 West Tucson-Painted Hills Ranch
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #52 on: November 08, 2021, 09:40:49 PM »
As I scrutinize your obs further, I really don't see any problem on your end, none. The graduations are fine. Perhaps Meso's jacked or your neighbors are really jacked. Up to you to find out.

Offline fkapp

  • Forecaster
  • *****
  • Posts: 317
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #53 on: November 08, 2021, 09:58:53 PM »
Thanks. Was a strange evening with calm winds to start and quick falling Temps.  Then winds picked up sw off lake Erie and shot temp up 9 degrees in a little over hr.  Could be just function of quicker response time.
Will enjoy and see how goes over larger sample over long run.

Thanks again
Frank

Offline azchrisf

  • Cobra Weather Dominator Operator
  • Forecaster
  • *****
  • Posts: 433
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #54 on: November 09, 2021, 03:08:45 AM »
Yeah those spikes are not from the fan moving too much air it's something else. Did sprinklers or something come on?
Davis Vantage Pro 2 Plus 6163 w/ 8 Transmitters!
Also doing Soil and Leaf 4x
WU: KAZGLEND106 CWOP: FW1398 (F1398) Purpleair: 98793/LAZGLEND8
My setup:
https://www.wxforum.net/index.php?topic=41867.0

Offline fkapp

  • Forecaster
  • *****
  • Posts: 317
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #55 on: November 09, 2021, 06:25:29 AM »
Hi. No sprinklers here this time of year as is fall up in Buffalo, NY.   Thanks for suggestion.
Will keep eye on it and see if happens again this evening when sun sets.

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 6214
    • LiVE WEATHER
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #56 on: November 09, 2021, 10:04:10 AM »
The welded core with open plates works best with FARS. They really aren't that expensive without the electronics attached.  I've tried the open core Dfars and it doesn't work as well being wide open.  On the inlet screencap, you can cover it with filter material and slip it back on. I use silk 100 thread and leave the filter off the sensor. I don't know if it's needed but have always used the insulator too.

Scaled has an exploited view of what is needed.  Of course, you don't want anything to do with solar or batteries.
 
https://www.scaledinstruments.com/wp-content/uploads/2020/12/24hr_fars_Exploded_Diagram.pdf

Here is the welded core. On backorder, it looks like: https://www.scaledinstruments.com/shop/davis-instruments/parts/vantage-pro2-parts/radiation-shield-parts/davis-7345-029-vantage-pro2-24-hr-spars-welded-core/

Randy

Offline fkapp

  • Forecaster
  • *****
  • Posts: 317
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #57 on: November 09, 2021, 12:32:01 PM »
Thanks, I used that schematic from Scaled and that is the setup I have (less solar panel and batteries).
May use solar in the summer to avoid extension cord across yard when mowing but that is for another day.

Agree not sure if need the insulator, but installed as diagram called for.
Figured with moving air and the open plates already had plenty of insulation so interesting you mentioned.
Would be curious if anyone is running without the insulator?


Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 6214
    • LiVE WEATHER
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #58 on: November 09, 2021, 01:17:32 PM »
Thanks, I used that schematic from Scaled and that is the setup I have (less solar panel and batteries).
May use solar in the summer to avoid extension cord across yard when mowing but that is for another day.

Agree not sure if need the insulator, but installed as diagram called for.
Figured with moving air and the open plates already had plenty of insulation so interesting you mentioned.
Would be curious if anyone is running without the insulator?

Oh good, I thought by post #26 this was a dfars and was saying oh no.
Randy

Offline jerryg

  • Forecaster
  • *****
  • Posts: 872
  • weather is never boring
    • victoria texas weather
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #59 on: November 09, 2021, 03:46:08 PM »
You need the insulator, look at the inside and it has ridges that create an air gap between the sensor housing and the insulator, it is another air intake tube that scrubs any heat away from the sensor chamber.

Offline CW2274

  • Forecaster
  • *****
  • Posts: 6063
    • Conditions @ CW2274 West Tucson-Painted Hills Ranch
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #60 on: November 09, 2021, 04:53:00 PM »
Would be curious if anyone is running without the insulator?
Agree with Jerry. The insulator is there for a reason. Just as an FYI, the 24hr shield is patented so I figure they know what they're doing.

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 6214
    • LiVE WEATHER
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #61 on: November 09, 2021, 04:53:20 PM »
That's right Jerry forgot about that. Another area to scrub heat away from the sensor is the air gap around the insulator.
Randy

Offline fkapp

  • Forecaster
  • *****
  • Posts: 317
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #62 on: November 09, 2021, 05:06:20 PM »
Thanks guys for explaining the mechanics of the shield.
I am very happy with the way been running so far.
Much calmer wind day today with mix of sun and clouds throughout the day.
Has been very stable temp throughout.
I have the SF2 Cap installed as have since setup station 2 years ago.

Few more quality suspect points today on Mesowest because of dewpoint variance again today, but am starting to suspect is function of data quality around me.
Not going to worry about it as know am running shield to build specs  :grin:

Thanks again
Frank

Offline CW2274

  • Forecaster
  • *****
  • Posts: 6063
    • Conditions @ CW2274 West Tucson-Painted Hills Ranch
Re: AC Case fan for 24 HR Davis FARS shield mod recommendation requests
« Reply #63 on: November 09, 2021, 05:17:22 PM »
Not going to worry about it as know am running shield to build specs  :grin:
Good. QC is a tool, not an end-all-be-all. Nobody knows your data better than you.