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 Stevenson screens 
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 Post subject: Re: Stevenson screens
PostPosted: Mon Jul 06, 2015 6:35 pm 
Chief Area Forecaster
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Joined: Mon Nov 02, 2009 9:25 pm
Posts: 5335
Location: Drumburgh
Altitude: 7m
Weather Station: Davis VP2
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darrog wrote:
HOW DOES A NEW SCREEN TEMP READINGS?

could almost be a new thread, but since my screen as been up there has been a change.

My max' temps have increased - that's in comparison to my AWS
previously my screen had lower Max's - now they are = and on the odd occasion slighter higher, that never used to happen.

Min' temps - at present are remaining the same as before, ie: the screen lower by 0.2 - 0.5c


My screen Mx temps are always higher (about +0.3) compared to the AWS. Screen Mins are about -0.1 below but sometimes spot on.
Lot depends on ones local enviroment.

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 Post subject: Re: Stevenson screens
PostPosted: Mon Jul 06, 2015 8:45 pm 
Professor
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Joined: Mon Nov 02, 2009 8:52 pm
Posts: 7478
Location: Brampton
Altitude: 117m
Weather Station: Davis VP2
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Screen temps varies here aswell - sometimes they are the same sometimes as much as a degree out. Ironically on the warmest day last week, just 0.2c different.

Unless you have your sensor inside the screen next to your thermometer, its not a true test of accuracy, in fact I was talking to someone a few days ago who has dismantled his VP2 weather station and placed the temp sensor inside his screen

Rain measure - lies inside screen, on the left, rolls abit in the wind but hasnt broken yet. I think mine would be more at risk out of the screen, I would dropped it on route of get kicked by a football etc.

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 Post subject: Re: Stevenson screens
PostPosted: Mon Jul 06, 2015 11:37 pm 
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Joined: Mon Nov 02, 2009 10:23 pm
Posts: 1864
Location: Maulds Meaburn, Cumbria
Altitude: 183
Weather Station: Davis VPro2
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It's just that it has become noticeable that my screen Max's have risen with the new screen when compared to the AWS.

For those of you with both a Vpro2 and a new style screen, was there any noticeable shift when you changed screens?

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 Post subject: Re: Stevenson screens
PostPosted: Tue Jul 07, 2015 10:50 am 
Professor
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Joined: Mon Nov 02, 2009 8:52 pm
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Location: Brampton
Altitude: 117m
Weather Station: Davis VP2
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I think I had my new screen before my VP2 - I had a WM918 with my old screen so unable to compare

I cant really offer a decent recent why its happened to such a noticeable effect, but my screen is number 1 for me and the VP2 is for back up/support.

I would leave it for a while, then perhaps you could adjust your VP2, you can raise or lower its output automatically if still not happy.

Yet more expense but you could buy a new temp sensor for VP2

( I have a spare temp station probe and Console, if range isnt to far, you could place this probe inside screen and compare. I dont need it for a little while, was keeping it back to act as a grass min thermom for the autumn/winter)

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http://www.bramptonweather.co.uk
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 Post subject: Re: Stevenson screens
PostPosted: Tue Jul 07, 2015 1:03 pm 
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Joined: Mon Jun 07, 2010 10:20 pm
Posts: 1993
Location: Bolton le Sands
Altitude: 10
Weather Station: Labjack
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Apologies for the late reply, this retirement lark can be very time consuming. This is how I store my rain measure as promised.

Mike

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www.lancastrian-imaging.co.uk/sp/weather/


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 Post subject: Re: Stevenson screens
PostPosted: Tue Jul 07, 2015 1:06 pm 
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Joined: Mon Jun 07, 2010 10:20 pm
Posts: 1993
Location: Bolton le Sands
Altitude: 10
Weather Station: Labjack
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Mmmm. No Picture. lets try again!

Mike


Attachments:
IMG_1104.JPG
IMG_1104.JPG [ 124.96 KiB | Viewed 559 times ]

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 Post subject: Re: Stevenson screens
PostPosted: Thu Jul 09, 2015 10:26 am 
Professor
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Joined: Mon Nov 02, 2009 8:52 pm
Posts: 7478
Location: Brampton
Altitude: 117m
Weather Station: Davis VP2
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And if all else fails you have your pine cone !!

Good use of the entire screen, wonder if the electrical activity raises the temp in winter. ?

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http://www.bramptonweather.co.uk
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 Post subject: Re: Stevenson screens
PostPosted: Thu Jul 09, 2015 4:30 pm 
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Joined: Mon Jun 07, 2010 10:20 pm
Posts: 1993
Location: Bolton le Sands
Altitude: 10
Weather Station: Labjack
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You cannot have a Screen without a pine cone! Its just got to be done.
The electrical activity is barely noticeable. I am using amplifiers (the circular box) to make the signal readable, but it only outputs between 4 - 20 ma, and uses a very low voltage.

Mike

PS I have two pine cones in their, to provide corroborating data! Sadly I have not been able to get hold of a national standard pine cone to calibrate mine with.

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www.lancastrian-imaging.co.uk/sp/weather/


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