Cumulus Support

Hi !
Since few days, we have sunny days, and very hot (Temperature in afternoon is above 30°).
And i see on the graphs that UV maximum is always 4 ans some times decreasing to 2 !! My UV sensor is mounted on a pylone, at 4m from the ground, vertically.
At 5pm, uv is near 0 (perhaps 1)

I suspect that the sensor is wrong. Anybody has the same problem with the OS WMR200 UV Sensor ?
On this picture, i see that the UV SENSOR is mounted at 45 degrees ..

Is it good ?

Thx !

I have the same problem. Max level 4 and I am in Indonesia with lots of sun. Changed the sensor already to a new one. Same result.

Hi,

No Problem here with the same UV Sensor. (Oregon UVN800)
I mounted it indeed under a 450 angle, facing directly South. (into Sun path at noon)
Currently still measuring (in Toronto) a strong UV 8 at mid-day (Forecast says 6 - 8).
After initial installation, I had some "loose" contact in battery compartment, but fixed with a small piece of Aluminum foil
Do you have consitent transmission to main console?

Cheers,

Arthur

Im in Essex, been getting up to about 5 latly here, not sure whats thas like fir anyone else round this way, but I think its anout right?

Excuse my typing, ipad keys and me don't agree.

HI,

When the UV Sensor indicates a level "4", it obviously is working.
If it's malfunctioning, I would say it displays either "0" (nothing) or it works properly.

On my site I use a 7-Day UV Index Forecast script from Saratoga WX, with UV data that is provided (with permision) by TEMIS (http://www.temis.nl/).
Check it out and you can see the actual (Forecast) UV values for your region by typing in your Long/Lat coordinates.

Cheers,

Arthur

ref: Oregon UVN800 mounting.

I am under the impression the unit is to be mounted vertically. Mine is mounted vertically (however not transmitting data to my old 968 console) and displaying 11 and 12 on sunny days in July (North Eastern Spain).

gwheelo

HI,

Seems a bit high to me.
According TEMIS (www.temis.nl) the UV Index has not been above 9.68 in July 2012 in Rome Italy (similar Lat (42o as your location).
Toronto has measured a few times a max UV of 10 in July (Lat 43o), similar to N.California / Milan Italy).
I can't find any specific installation instructions from Oregon in regards to the UVN800.

The site mentioned above (see UV Radiation) is interesting for daily UV forecast as well as previous dates/months/years for many locations in the World.

Cheers,

Arthur

Seems a bit high to me

My 11 and 12 readings are from an inexpensive and non calibrated unit from Oregon - so please understand my point. Mounted vertically works!

gwheelo

Wall mount or stake apparatus for insertion into the ground.

The photo, the Oregon description, and the mounting bracket kinda makes me think of a vertical mounting posture.

gwheelo

I have a UVN800 sensor that came with my oregon WMR88 and mounted it in a vertical postion using the bracket that came with it. Working well so far. Received a maximum of 4 today. Its been spot on with the met office forecasts in my area.

I have two that I swap from time to time to ensure I get a correct reading . They both work and are compatible with the Met predictions exactly . Today after a 32 day "rainless" period followed by 43.4 mm of rain 36 hours ago it is reading now 7. . This makes sense to me .

I have the same UV sensor and it has worked fine since I installed it here in Spain at Christmas. The readings varied from 1 to 4 for months and I thought everything worked fine but we are in the middle of summer here in Spain where the local weather station says we are getting UV index of 10 today but my sensor will not go past 4 no matter how sunny it is, today it was really hot with clear skies and temperature of 44 deg C but still will not pass 4. Have I wasted my money or is there a fix for this.