13-05-2015, 16:23
Just one caution with the saucers for the radiation shield. I notice that they have a bit of a turn up at the edge.
If it is able to be rained on, the lip will hold a small amount of rain and that can affect the humidity reading until it evaporates. Better if possible to have ones that the rain can just run off.
Radiation shields are a complete subject and you will find as many different designs and ideas as there are people building weather stations. Ones built from plastic are not ideal as they tend to re radiate into the internal cavity. Although more complex to build, using a light timber like pine will generally get a better result.
A proper stevenson screen will normally have 2 sets of louvres so that there is no possibility of external radiation penetrating the enclosure while allowing the free flow of air.
If it is able to be rained on, the lip will hold a small amount of rain and that can affect the humidity reading until it evaporates. Better if possible to have ones that the rain can just run off.
Radiation shields are a complete subject and you will find as many different designs and ideas as there are people building weather stations. Ones built from plastic are not ideal as they tend to re radiate into the internal cavity. Although more complex to build, using a light timber like pine will generally get a better result.
A proper stevenson screen will normally have 2 sets of louvres so that there is no possibility of external radiation penetrating the enclosure while allowing the free flow of air.
(20-12-2014, 08:19)Live_Steam_Mad Wrote:(31-07-2014, 00:37)Werk_AG Wrote:My home made aspired radiation shield
I am curious, where did you get those white plastic "plates" / "dishes" / "bowls" that you made your FARS from? Got a link to the item?
Regards,
Alistair G.
Chaos Manor Weather
Mount Evelyn, Australia
http://www.sdsnet.net/weather/cumulus/indexframe.htm
LaCrosse WS-2300, until I have a Weatherduino Pro2 running.