[werk_ag]

Would these do as a cover with the sensor mounted in, for example a , piece of 22mm conduit pipe with this as a lense?
http://www.ebay.co.uk/itm/Watch-Glass-Ac...5d5563789b

Who knows?
Using a lens like that can be a good idea to cover a hole for the UV sensor... I'm registering it.
I like to build things, I'm always trying different approaches.

Those are from the last one: Fast and cheap to build, using the box of a garden solar light (less than 5€)

Note: Original PV cell was removed and changed by a better quality one

Trying to assemble the UV sensor and the PV cell (for the Solar Radiation) on the same piece, seems to me the best option (keeping the cables short, between the sensors and the Solar/UV interface board)

Anyway, I think that will be very interesting watching the thousand ways that each person will find to solve the main problem. Protect the electronic from weather elements (rain, hail, temperature, etc), and at the same time don't put materials too thick (or not transparent to desired radiation. From UV to IR, if for both sensors ) in front of the sensors.