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• I have a La Crosse WS-2811 system, which I think the rain gauge is measured only half of the precipitation amount. Today it rain from 16:52 to 17:23, in that
Message 1 of 5 , May 30 3:34 AM
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I have a La Crosse WS-2811 system, which I think the rain gauge is measured only half of the precipitation amount.

Today it rain from 16:52 to 17:23, in that time I use a measuring cup that have a diameter of 6.2 cm. (3.1 cm. radius) to collect the rain. I have 40 ml in the measuring cup, but La Crosse said rain fall amount is 7.87 mm.

So I do the calculation,

rain fall amount (cm) = Volume(ml) / (3.14 * radius(cm) * radius (cm))
rain fall amount (cm) = 40 / (3.14*3.1*3.1)
rain fall amount (cm) = 1.32558
rain fall amount (mm) = 1.32558 * 10 = 13.26

Am I correct with the calculation? If so I can tweak the WUHU to report the correct amount.

Regards,
• Hi, Well the basic setup of the ws2811 rain gauge Is 0.2mm per tip. Try to poor water slowly in it untill you hear exactly 10 tips Wait 5min then you have to
Message 2 of 5 , May 30 4:01 AM
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Hi,
Well the basic setup of the ws2811 rain gauge
Is 0.2mm per tip. Try to poor water slowly in it untill you hear exactly 10 tips
Wait 5min then you have to read a total of 2mm

Thanks

Sent from my iPhone

On 30 May 2012, at 01:34 PM, "ibangkok24" <ibangkok24@...> wrote:

I have a La Crosse WS-2811 system, which I think the rain gauge is measured only half of the precipitation amount.

Today it rain from 16:52 to 17:23, in that time I use a measuring cup that have a diameter of 6.2 cm. (3.1 cm. radius) to collect the rain. I have 40 ml in the measuring cup, but La Crosse said rain fall amount is 7.87 mm.

So I do the calculation,

rain fall amount (cm) = Volume(ml) / (3.14 * radius(cm) * radius (cm))
rain fall amount (cm) = 40 / (3.14*3.1*3.1)
rain fall amount (cm) = 1.32558
rain fall amount (mm) = 1.32558 * 10 = 13.26

Am I correct with the calculation? If so I can tweak the WUHU to report the correct amount.

Regards,

=
• I just do what you said, I got 2.5mm for that 10 tips.
Message 3 of 5 , May 30 5:29 AM
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I just do what you said, I got 2.5mm for that 10 tips.

--- In wuhu_software_group@yahoogroups.com, Josephkareh <josephkareh@...> wrote:
>
> Hi,
> Well the basic setup of the ws2811 rain gauge
> Is 0.2mm per tip. Try to poor water slowly in it untill you hear exactly 10 tips
> Wait 5min then you have to read a total of 2mm
>
> Thanks
>
> Sent from my iPhone
> www.meteokareh.com
>
> On 30 May 2012, at 01:34 PM, "ibangkok24" <ibangkok24@...> wrote:
>
> > I have a La Crosse WS-2811 system, which I think the rain gauge is measured only half of the precipitation amount.
> >
> > Today it rain from 16:52 to 17:23, in that time I use a measuring cup that have a diameter of 6.2 cm. (3.1 cm. radius) to collect the rain. I have 40 ml in the measuring cup, but La Crosse said rain fall amount is 7.87 mm.
> >
> > So I do the calculation,
> >
> > rain fall amount (cm) = Volume(ml) / (3.14 * radius(cm) * radius (cm))
> > rain fall amount (cm) = 40 / (3.14*3.1*3.1)
> > rain fall amount (cm) = 1.32558
> > rain fall amount (mm) = 1.32558 * 10 = 13.26
> >
> > Am I correct with the calculation? If so I can tweak the WUHU to report the correct amount.
> >
> > Regards,
> >
> >
> >
> >
> >
> >
> >
>
• Hi this is fine. Since the tip is a bit more than 2 Your r gauge is good Sent from my iPhone www.meteokareh.com
Message 4 of 5 , May 30 6:00 AM
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Hi this is fine. Since the tip is a bit more than 2

Sent from my iPhone

On 30 May 2012, at 03:29 PM, "ibangkok24" <ibangkok24@...> wrote:

I just do what you said, I got 2.5mm for that 10 tips.

--- In wuhu_software_group@yahoogroups.com, Josephkareh <josephkareh@...> wrote:
>
> Hi,
> Well the basic setup of the ws2811 rain gauge
> Is 0.2mm per tip. Try to poor water slowly in it untill you hear exactly 10 tips
> Wait 5min then you have to read a total of 2mm
>
> Thanks
>
> Sent from my iPhone
> www.meteokareh.com
>
> On 30 May 2012, at 01:34 PM, "ibangkok24" <ibangkok24@...> wrote:
>
> > I have a La Crosse WS-2811 system, which I think the rain gauge is measured only half of the precipitation amount.
> >
> > Today it rain from 16:52 to 17:23, in that time I use a measuring cup that have a diameter of 6.2 cm. (3.1 cm. radius) to collect the rain. I have 40 ml in the measuring cup, but La Crosse said rain fall amount is 7.87 mm.
> >
> > So I do the calculation,
> >
> > rain fall amount (cm) = Volume(ml) / (3.14 * radius(cm) * radius (cm))
> > rain fall amount (cm) = 40 / (3.14*3.1*3.1)
> > rain fall amount (cm) = 1.32558
> > rain fall amount (mm) = 1.32558 * 10 = 13.26
> >
> > Am I correct with the calculation? If so I can tweak the WUHU to report the correct amount.
> >
> > Regards,
> >
> >
> >
> >
> >
> >
> >
>

=
• I meant a bit more than 0.2mm Sent from my iPhone www.meteokareh.com
Message 5 of 5 , May 30 6:05 AM
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I meant a bit more than 0.2mm

Sent from my iPhone

On 30 May 2012, at 04:00 PM, Josephkareh <josephkareh@...> wrote:

Hi this is fine. Since the tip is a bit more than 2

Sent from my iPhone

On 30 May 2012, at 03:29 PM, "ibangkok24" <ibangkok24@...> wrote:

I just do what you said, I got 2.5mm for that 10 tips.

--- In wuhu_software_group@yahoogroups.com, Josephkareh <josephkareh@...> wrote:
>
> Hi,
> Well the basic setup of the ws2811 rain gauge
> Is 0.2mm per tip. Try to poor water slowly in it untill you hear exactly 10 tips
> Wait 5min then you have to read a total of 2mm
>
> Thanks
>
> Sent from my iPhone
> www.meteokareh.com
>
> On 30 May 2012, at 01:34 PM, "ibangkok24" <ibangkok24@...> wrote:
>
> > I have a La Crosse WS-2811 system, which I think the rain gauge is measured only half of the precipitation amount.
> >
> > Today it rain from 16:52 to 17:23, in that time I use a measuring cup that have a diameter of 6.2 cm. (3.1 cm. radius) to collect the rain. I have 40 ml in the measuring cup, but La Crosse said rain fall amount is 7.87 mm.
> >
> > So I do the calculation,
> >
> > rain fall amount (cm) = Volume(ml) / (3.14 * radius(cm) * radius (cm))
> > rain fall amount (cm) = 40 / (3.14*3.1*3.1)
> > rain fall amount (cm) = 1.32558
> > rain fall amount (mm) = 1.32558 * 10 = 13.26
> >
> > Am I correct with the calculation? If so I can tweak the WUHU to report the correct amount.
> >
> > Regards,
> >
> >
> >
> >
> >
> >
> >
>

=

=
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