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Please help me calibrate the rain gauge.

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  • ibangkok24
    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,
    • Josephkareh
      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,

        =
      • ibangkok24
        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,
          > >
          > >
          > >
          > >
          > >
          > >
          > >
          >
        • Josephkareh
          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
            Your r gauge is good


            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,
            > >
            > >
            > >
            > >
            > >
            > >
            > >
            >

            =
          • Josephkareh
            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
              Your r gauge is good


              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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