20-04-2022, 20:48
I have been very happy with my system, it's been performing really well - I have changed the old fine offset wind sensors for a Davis 6410 and I managed to get hold of a 'new in box' Davis rain gauge (7852) for an Ebay bargain of £26 delivered!
Anyway, Today I decided to try different materials to cover my solar & uv sensor. I have been using 3mm Perspex but even on really clear sunny days the uv readings have never been more than 1.
The tests I performed Today was as follows, the Day started with clear blue skies but became hazier in the afternoon.
I removed the original 3mm perspex at 10:30 and left the sensors uncovered for 30 mins, I then covered the sensors with 1mm thick PTFE for 30 mins, then every 30 mins I changed the cover for anything I could find that was clear! 2mm 'picture frame' glass, then 2mm clear plastic - not sure what it is, it was from a box lid, then I left it uncovered again, 3mm glass from a greenhouse, then I put the 3mm perspex back on again, finally put the 3mm glass back on.
As can be seen quite interesting. Now for the questions
From the (not very scientific) results 3mm perspex or 1mm PTFE is no good for uv! but everything else seemed ok, however, the uv readings seem way too high! the met office forecast a max uv of 5 and I was getting a reading of 10! Is there a way to calibrate the sensor? What are the variable resistors RV1 and RV3 for?
Thanks, Steve
Anyway, Today I decided to try different materials to cover my solar & uv sensor. I have been using 3mm Perspex but even on really clear sunny days the uv readings have never been more than 1.
The tests I performed Today was as follows, the Day started with clear blue skies but became hazier in the afternoon.
I removed the original 3mm perspex at 10:30 and left the sensors uncovered for 30 mins, I then covered the sensors with 1mm thick PTFE for 30 mins, then every 30 mins I changed the cover for anything I could find that was clear! 2mm 'picture frame' glass, then 2mm clear plastic - not sure what it is, it was from a box lid, then I left it uncovered again, 3mm glass from a greenhouse, then I put the 3mm perspex back on again, finally put the 3mm glass back on.
As can be seen quite interesting. Now for the questions
From the (not very scientific) results 3mm perspex or 1mm PTFE is no good for uv! but everything else seemed ok, however, the uv readings seem way too high! the met office forecast a max uv of 5 and I was getting a reading of 10! Is there a way to calibrate the sensor? What are the variable resistors RV1 and RV3 for?
Thanks, Steve