1080 temperature sensor in the sun - help

[Areecki]

Hi, I'm from Polish, I'm going to buy the stations 1080 and I wanted to ask how to protect the temperature sensor. I would be grateful for any pictures of that protection. Please also give the dimensions of the sensor temperature in 1080
Sorry for my English.


I mean something like this: http://www.up.4clubbers.pl/out.php/i615_2338.jpg
How do I do?

[steve]

Hi, there are quite a few threads in the forum about this, including this one, which I think describes the actual one in your picture:

https://cumulus.hosiene.co.uk/viewtopic.php?f=13&t=1623

[Repairman77]

Areecki; for your information the hole to accommodate the sensor/transmitter unit needs to be a minimum of 45mm (inside tube diameter); 50mm inside diameter plastic waste pipe will do nicely.
Mike.

[Areecki]

Thank you very much for the reply. I hope that with the help of google translator can manage the construction of the security sensor. I wanted to ask how different types of stations 1080 and 1090. Is there any difference apart from the display? In Poland, the Model 1090 came a few days ago and is more expensive since 1080 about 30 - $ 35.
Whether sensors are better, and that soft has been changed? Yours

PS What is the effective protection of the sensor and what is the difference in the sunny days
as a result of the temperature?

Very good website: http://users.otenet.gr/ ~ weather / project_radiation-shield.html

Areecki; for your information the hole to accommodate the sensor/transmitter unit needs to be a minimum of 45mm (inside tube diameter); 50mm inside diameter plastic waste pipe will do nicely.
Mike.

Can not you do this without the PVC pipe from the same pot?
Does not apply in this windmill, and I fear that the PVC pipe + pots will be little air movement, because I want to do the same pot without a fan and PVC pipe. Something like in this photo:
http://www.up.4clubbers.pl/out.php/i627_d.JPG
This is not my design, and is too narrow for the sensor to 1080

Diameter holes in the pots will therefore be around 45 - 50 mm.
A minimal amount of pots they can be?

Inside the pots should be painted matt black paint on the outside of the white?

[Repairman77]

Thank you very much for the reply. I hope that with the help of google translator can manage the construction of the security sensor. I wanted to ask how different types of stations 1080 and 1090. Is there any difference apart from the display? In Poland, the Model 1090 came a few days ago and is more expensive since 1080 about 30 - $ 35.
Whether sensors are better, and that soft has been changed? Yours

Mine is WH1080, I do not know the WH1090 model.

PS What is the effective protection of the sensor and what is the difference in the sunny days
as a result of the temperature?

It can raise by up to 2 degrees above the actual air temperature

Very good website: http://users.otenet.gr/ ~ weather / project_radiation-shield.html

Areecki; for your information the hole to accommodate the sensor/transmitter unit needs to be a minimum of 45mm (inside tube diameter); 50mm inside diameter plastic waste pipe will do nicely.
Mike.

Can not you do this without the PVC pipe from the same pot?
Does not apply in this windmill, and I fear that the PVC pipe + pots will be little air movement, because I want to do the same pot without a fan and PVC pipe. Something like in this photo:
http://www.up.4clubbers.pl/out.php/i627_d.JPG
This is not my design, and is too narrow for the sensor to 1080

That design would work without the tube.

Diameter holes in the pots will therefore be around 45 - 50 mm.
A minimal amount of pots they can be?

It would depend on the height of the pots, but enough to cover the sensor unit with perhaps 1" above the top of the sensor.

Inside the pots should be painted matt black paint on the outside of the white?

No, black will absorb heat, they need to be painted white inside and out.

Answers in red bold italics,

Hope that helps,

Mike.

[beteljuice]

No, black will absorb heat, they need to be painted white inside and out

NOT QUITE TRUE ! - or at least in error. The original statement is correct - Ideally exterior should be brilliant gloss white or polished metal, inner surfaces should be matt (paintboard) black.

Theoretically all white surfaces would act as mirrors, thus directing the radiation onto your sensor housing. However; unless you have 'perfect' surfaces, each reflection is reduced in power, thus for most of us it is a measure unnecessary for the quality of our kit.

[Repairman77]

No, black will absorb heat, they need to be painted white inside and out

NOT QUITE TRUE ! - or at least in error. The original statement is correct - Ideally exterior should be brilliant gloss white or polished metal, inner surfaces should be matt (paintboard) black.

Theoretically all white surfaces would act as mirrors, thus directing the radiation onto your sensor housing. However; unless you have 'perfect' surfaces, each reflection is reduced in power, thus for most of us it is a measure unnecessary for the quality of our kit.

We may have to agree to disagree on this one Beteljuice.

My theory on this is that due to the angle of the pot saucers' edges surely the light and heat from the sun will be reflected upward into the saucer above; which if painted black will absorb the heat. Just my theory. All the designs of these screens I've seen have been painted white inside and out. Backing up this theory; why are all professional Stevenson screens white inside and out?

Mike.

[steve]

Backing up this theory; why are all professional Stevenson screens white inside and out?

Modern UK Met Office screens now have the louvres painted black inside. Apparently they conducted tests and found this was better.

http://www.northisles-weather.co.uk/metscreen_2437.jpg

[beteljuice]

.. why are all professional Stevenson screens white inside and out?

Because they were created in the days of The Empire for uniformity and ease of construction wherever in the world we were located.

See also:

http://www.metspec.net/products.html

and 'saucer' stlyle (Incidentally Davis spec say unaspirated read 2C high at solar noon)

ftp://ftp.campbellsci.com/pub/csl/outgo ... _dec08.pdf

And here's an interesting take on pipe style (natural ventilation), I especially like his 'cap' mod and his thoughts on mounting.

http://sheepdogsoftware.co.uk/sc3swt.htm (third the way down)

[Repairman77]

Backing up this theory; why are all professional Stevenson screens white inside and out?

Modern UK Met Office screens now have the louvres painted black inside. Apparently they conducted tests and found this was better.

http://www.northisles-weather.co.uk/metscreen_2437.jpg

I didn't know that Steve; must have been a fairly recent development then; last time I looked at Steveson screens (far too expensive for me - I made mine) they were white inside, but that was 2 or 3 years ago.

I bow to a higher intelligence Steve and Beteljuice.

I still can't quite understand the physics of why it should be better though.

Mike.

[steve]

I bow to a higher intelligence Steve and Beteljuice.

No higher intelligence involved for my part; I just remembered Dave Wheeler on Fair Isle mentioning that he'd got his new screen with the black louvres inside (that's his in the picture I linked to).

[Areecki]

What's different about 1080 and 1090?
And you better buy and why. ?

If I do not have low-pots can I do to protect the ordinary
pot high? Just take 3 or 4 pots and the larger the space between them.

[Repairman77]

What's different about 1080 and 1090?
And you better buy and why. ?

The 1090 appears to have a different console screen to the 1080 but the same remote units.
Here are the links...
http://www.alibaba.com/product-tp/10467 ... _Wind.html
http://www.alibaba.com/product-tp/12307 ... ation.html

If I do not have low-pots can I do to protect the ordinary
pot high? Just take 3 or 4 pots and the larger the space between them.


You really need 6 or 7 low pots to be effective although if you use the inner tube then it would have a small affect to reduce temperature problems. I would think high pots would tend to trap the heat more.

Mike.

[Areecki]

The sensor of 1080 is 50 mm in diameter? It is only 5 cm and tends to be greater in the photo.
How much should the diameter of the lower base so as to drill the appropriate
hole, leaving space on the screws.

How much is best? : Http://www.up.4clubbers.pl/out.php/i661_12.PNG

Thanks for all the information

P.S
Could you send a good quality photo of your sensor, you can see the avatar? I would like to see how you have the shield attached to the sensor.

[Repairman77]

The sensor of 1080 is 50 mm in diameter? It is only 5 cm and tends to be greater in the photo.
How much should the diameter of the lower base so as to drill the appropriate
hole, leaving space on the screws.

The sensor is just under 42mm wide by about 25mm, and around 100mm high, so a 50mm tube is ideal which slips over the sensor easily. You really need a tube as well as the pots to make it effective. Pots on their own would not work so well.

How much is best? : Http://www.up.4clubbers.pl/out.php/i661_12.PNG

You need a gap on the outside of the tube to the the inside holes of the pots, 10mm would be OK.
The size of the pots does not matter but at least 150mm is best.
Your diagram shows the whole thing upside down.

Thanks for all the information

P.S
Could you send a good quality photo of your sensor, you can see the avatar? I would like to see how you have the shield attached to the sensor.

The tube just rests on the sensor mounting arm.
There is a picture of the senso on this thread 4th post down...
https://cumulus.hosiene.co.uk/viewtopic.p ... t+humidity

This picture shows how the tube is attached to the pots...