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Author Topic: The engagement surface rain gauge VP2 and their calibration.  (Read 1390 times)

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Offline Matrix

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The engagement surface rain gauge VP2 and their calibration.
« on: February 26, 2017, 02:46:08 PM »
Hello,
Does anyone know what is the catch area for VP2 bucket?
I'm not sure setting a shuttle from the manufacturer because one side is turned upside down when 2.9mll and other party at 4.6mll water.
Just this setting results in a deterioration of rainfall.
How many milliliters of water in zkutečnosti has flip the shuttle.

Offline niko

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #1 on: February 26, 2017, 03:03:52 PM »
Does anyone know what is the catch area for VP2 bucket?

214 cm2 (from the Davis specification).

Offline Matrix

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #2 on: February 26, 2017, 03:21:27 PM »
That is more than two meters!
Are you sure that this is so?

Offline niko

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #3 on: February 26, 2017, 03:30:53 PM »
You asked for the area, that is the area in square centimeters.

Hmmm, maybe your browser didn't show the 2 in cm2   :?
« Last Edit: February 26, 2017, 03:35:38 PM by niko »

Offline Matrix

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #4 on: February 26, 2017, 05:12:23 PM »
The browser is fine, but 214 cm2 is 2.1 meters which is weird, maybe I can not count :-D

Bashy

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #5 on: February 26, 2017, 05:28:18 PM »
Aint it 856?

Offline Weather Display

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #6 on: February 26, 2017, 06:52:21 PM »
214cm2 is 2.14m2
so something not right there, lol
214mm2?

Offline niko

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #7 on: February 26, 2017, 07:03:44 PM »
214cm2 is 2.14m2


Nope! You divide cm by 100 to get metres. You divide square cm by 100*100 = 10,000 to get square meters  :wink:


Offline Weather Display

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #8 on: February 26, 2017, 07:13:55 PM »
yup, you are right
I should have known that
(I asked my daughter, but she got it wrong too)

Offline niko

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #9 on: February 26, 2017, 07:14:30 PM »
 :lol:

Offline Matrix

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #10 on: February 26, 2017, 07:36:55 PM »
I found this at our forum.
J question whether the area 214 or 240 cm2


I'll be more on the subject in 2010. Did the calibration raingauge Davis Vantage Pro 2 I count all the newly found and that your calibration and instructions were not very inaccurate. Begin by order. We know that the engagement surface raingauge Davis 240 cm2 precisely 240.52 cm2. First, calculate the how much should be "ml" of water to reach 1 mm of precipitation relative to the catchment area of ​​240.52 square centimeters. Radius receiving area raingauge is 8.75 cm, so we'll have some výslodok for "x" to "x" is the result of many "ml" of water required to reach 1 mm of rainfall. So x = 3.14159 * 8,75_2 = 240.52, we divide the 10-Timi and the result is 24.0 ml, ie x = 24.0 ml - tolkoto water should be 1 mm of rain. Thus, the logic should be 0.2 mm 5x less ie 24/5 = 4.8 ml = 0.2 mm = 1 flip. If the claim by http://www.novapec.cz from Aug 19. 2010 a report and the 544 ml. should nerovanlo but only 25.4 mm 23.6 mm. As well as to the proportion of seats, ie 544 ml = 25.4 mm so the engagement surface raingauge 240.52 cm2 but not just 214.08 cm2, however, as I wrote at the beginning, we all know that it is not so. This implies that you just slashed by + 6% and I think that is not a negligible number.
I'm station DAVIS calibrated in the summer and I put only 500 ml of water, according to the equation would equal 20.8 mm rainfall respectively. 104 tilting. In September came the big test when the present station napršalo 26.4 mm from analogue and varied tolerance of 1% is not around for me a huge success.
« Last Edit: February 26, 2017, 07:42:03 PM by Matrix »

Offline niko

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Re: The engagement surface rain gauge VP2 and their calibration.
« Reply #11 on: February 26, 2017, 08:27:13 PM »
J question whether the area 214 or 240 cm2

Just measure it. The diameter would have to be 1 cm bigger than the specification for the area to be 240 cm2.

 

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