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Hydreon RG-11 results

Discussion of this sensor and its uses
apenwith
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Hydreon RG-11 results

Postby apenwith » Wed Jun 20, 2012 3:05 pm

Hi
I'm not sure if this is the best place - or should this be in Weather ?

This is my set up.
About 2 hours of rain

Manual gauge 6.7mm
RG-11 7.4mm

ManualRG.jpg


FO tipping bucket 6.0mm
RG-11 (Cumulus) 11.2mm

Regards
Alan
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apenwith
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Re: Hydreon RG-11 results

Postby apenwith » Thu Jun 21, 2012 8:05 am

Hi
Results for 0900 20/06 to 0900 21/06
Results.jpg


Regards
Alan
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apenwith
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Re: Hydreon RG-11 results

Postby apenwith » Fri Jun 22, 2012 7:48 am

Hi
Results 0900 20/06 to 0900 21/06
Results.jpg

Regards Alan
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apenwith
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Re: Hydreon RG-11 results

Postby apenwith » Sat Jun 23, 2012 7:01 am

Hi
Results 22/06 to 23/06

NO RAIN

Regards
Alan

apenwith
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Re: Hydreon RG-11 results

Postby apenwith » Sun Jun 24, 2012 7:58 am

Hi
Results 0900 23/06 to 0900 24/06

Manual Station
RG11 29.4mm
Manual Gauge 18.1mm
Cumulus Station
RG11 29.0mm
FO Bucket 15.6mm
Debug log shows all ON/OFF pairs - no multiples

Regards
Alan

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Re: Hydreon RG-11 results

Postby apenwith » Sun Jun 24, 2012 10:58 am

Hi
I thought it would be interesting to show the graphical comparisons. First is the Cumulus Select a Graph for the FO bucket (lower trace) and the RG11 attached to Cumulus and the second the two RG's compared. The profile of the RGCum matches the FO Bucket although expanded. At least the timing looks similar in all cases. Obviously there is no timing available for the manual gauge.

rg11.jpg


Regards
Alan
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apenwith
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Re: Hydreon RG-11 results

Postby apenwith » Mon Jun 25, 2012 7:13 am

Hi
0900 24/06 to 0900 25/06
No Rain
Regards
Alan

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Re: Hydreon RG-11 results

Postby bruce45 » Mon Jun 25, 2012 7:19 am

Alan what sort of timescale was it for you ordering to receiving your rg11 unit? was just to give me an idea as to when to expect it so that i can then test it on the direct rs232 port to compare the results for the double tips

bruce

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Re: Hydreon RG-11 results

Postby apenwith » Mon Jun 25, 2012 8:42 am

Hi
I think it was 4 days for the first one - the second was longer probably due to customs (2 weeks?) so anyone's guess.
Regards
Alan

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Re: Hydreon RG-11 results

Postby bruce45 » Mon Jun 25, 2012 9:34 am

thanks for that info Alan

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Re: Hydreon RG-11 results

Postby AllyCat » Mon Jun 25, 2012 11:59 am

apenwith wrote:The profile of the RGCum matches the FO Bucket although expanded.
Hi Alan,

Well, not entirely. The first section (up to 10mm) does indeed correlate very well, especially since many users suggest that the FO gauge under-reads somewhat. But from then on, the FO registers 6mm and the Hydreon 18mm.

I believe that Hydreon admit that their gauge can over-read in some circumstances, particularly with the wind blowing raindrops across the "window", so it might be worth also displaying the windspeed (and maybe sunshine, etc.) to see if that affects the correlation.

It can also "report" the raindrop size to some extent, but that probably requires a rather more "intelligent" interface than the current DTR-DSR switching.

Cheers, Alan.

apenwith
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Re: Hydreon RG-11 results

Postby apenwith » Mon Jun 25, 2012 12:58 pm

Hi
What I meant was that the timing and shape of the graph was similar but I did say expanded by which I meant the RGCUM was over-reporting. I don't yet want to change the tipsize until there may or may not be a consistant correction. I agree it would be useful to use the windspeed as well but I have a problem in that the anemometer stops working in the rain - probably the mast top connection which I haven't had a chance to de-mount yet. The difference between the two RG's also needs investigation - but that's what the tests are for.
Regards
Alan

apenwith
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Re: Hydreon RG-11 results

Postby apenwith » Tue Jun 26, 2012 8:19 am

Hi
0900 25/06 to 0900 26/06
Manual Station
Manual Gauge 5.8mm
RG11 10.4mm
Cumulus Station
FO Bucket 6.6mm
RG11 7.6mm
Light Winds Some mist & light rain
Regards
Alan

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Re: Hydreon RG-11 results

Postby AllyCat » Tue Jun 26, 2012 11:03 pm

Hi,

Has anybody else noticed the following paragraph in the downloadable RG-11_Instructions but NOT in the paper manual supplied with the sensor:

"For best accuracy tipping bucket applications, we recommend annual treatment of the rain sensor lens with Rain-X. The Rain-X prevents a condition where the RG reads high because water droplets stuck on the sensor get blown by the wind, causing high readings. With Rain-X, larger droplets run off." [Hydreon's bolding not mine.]

I wonder if that's a recent recommendation or something that's now been withdrawn. Note the following Rain-X "Product description" on the Amazon.co.uk website:

"Please be aware that it [Rain-X] is not recommended for use on plastic surfaces. ....... The product will last up to 60 days."

Hydreon refer to the lens as "injection molded" which I think implies that it's plastic, and they refer to "annual treatment". Is there an equivalent UK product (WD40 is said NOT to be similar)? Also, I note that reviews on the Amazon.com site much prefer the "Original" Rain-X to the later "glass cleaning" version of the same brand.

Cheers, Alan.

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Re: Hydreon RG-11 results

Postby mcrossley » Wed Jun 27, 2012 7:12 am

Alan, from my following of the device this a new(ish) recommendation.

You can buy Rain-X at Halfords along with their own brand (cheaper) version, and other brands - I use it on my car windscreen.


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