Fine Offset - Despite the problems...

[mcrossley]

... can they provide any useful data. I have to keep reminding myself of this, here is todays comparison against a Davis Vantage Pro2.

Just for fun, no scientific value, blue is Davis, red is Fine Offset WH1090....

foWindSpeed.png

The pressure curves are a good match, the absolute difference varies as Davis applies a correction based on temperature & humidty etc. The FO just has a constant value applied. Sometimes they overlay almost exactly, others the FO is a bit higher or lower.

foPressure.png

foHumidity.png

My temperatures are often lower that the Cheadle Hulme station, being closer to open country.

foTemperature.png

[water01]

Well I think proves that they conclusively do, provided of course you do not get the dreaded sensor lost problem, for a fraction of the cost.

Keeping everything crossed here ( ) mine has been working without a hiccup for 1 3/4 years which means even if it fails now at current prices of a Davis Vue including data logger I could have 6 Fine Offsets giving me 10 1/2 years of use for the same price!!

[PaulMy]

Mark,
A neat comparison. And I see what looks like the Davis humidity spike issue in there as well,

Paul

[mcrossley]

The stations are about 5 miles apart, I have to admit that the comparisons aren't always as close as this and the FO radiation shield is anything but a rain hood.

[steve]

While my Fine Offset station was fully working, I had a similar experience with side-by-side comparisons with my VP2. For much of the time it tracked the Davis remarkably well, but at other times it seemed almost random for some of the readings.

[peterh]

My FO WH3081, equipped with the standard radiation shield, shows wild temperature and humidity deviations once the sun comes out. This desperately needs to be, and will soon be, cured with a Stevenson screen.

[uncle_bob]

Wow, that's very good and interesting data.

[ecco123]

My FO WH3081, equipped with the standard radiation shield, shows wild temperature and humidity deviations once the sun comes out. This desperately needs to be, and will soon be, cured with a Stevenson screen.

How many extra ºC deviation can it show on direct sun vs a properly shielded station like Davis etc..?

In the case you couldn't get a screen/shield would't it be better to place the senson in the shade even if it doesn't get the 4 winds??

Is the FO shield as useless as a "naked" oregon sensor like this?

[mcrossley]

And now we have had some melty snowy wet stuff, here is a rainfall comparison...

foRain.png

[peterh]

My FO WH3081, equipped with the standard radiation shield, shows wild temperature and humidity deviations once the sun comes out. This desperately needs to be, and will soon be, cured with a Stevenson screen.

How many extra ºC deviation can it show on direct sun vs a properly shielded station like Davis etc..?

Not sure how this would apply to summer heat, but yesterday, in our garden, it was miraculously about 7 degrees warmer than in the rest of the region.

In the case you couldn't get a screen/shield would't it be better to place the senson in the shade even if it doesn't get the 4 winds??

That's exactly what a Stevenson screen does
Putting it in the shade would mean putting it near the house, which gives other deviations.

Is the FO shield as useless as a "naked" oregon sensor like this?

I would think not.