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[wxsig] Rain Gauge Calibration

Gary R. Schenaman garysch at radiks.net
Mon Feb 21 17:56:33 UTC 2005


I WILL TRY TO FIND THE METHOD THAT I USED TO CALIBRATE USING AN HPLC PUMP
THAT IS TRACIABLE TO NS.  ONCE I FIND IT I WILL EMAIL EVERYONE WITH THE
METHOD.  HPLC IS A LAB PUMP THAT STANDS FOR HIGH PRESSUSE LIQUID
CHROMOTOGRAPHY.  BIG G.
----- Original Message ----- 
From: "Clay Cottingham" <Clay at Cottingham.net>
To: "TAPR Weather Station SIG Mailing List" <wxsig at lists.tapr.org>
Sent: Sunday, February 20, 2005 9:25 PM
Subject: [wxsig] Rain Gauge Calibration


> Trying to understand the theory behind the operation of the rain gauge.
>
> I have the original Dallas Semiconductor rain gauge. The instructions that
> come with it state to "Adjust the calibration screws so that 16 Oz at the
1
> inch per hour rate produces 100 counts." This appears to correspond to
1.00"
> indicated on the T238 display.
>
> Where I am confused is this: Taking the measurement of the radius of the
> rain gauge and caculating the area exposed and converting to ounces gives
me
> about 15 ounces per inch of rain:
>
> 5.875 inches diameter
> 2.9375 inches radius
>
> = 27.109 square inches
>
> At 1" of rain, this would be 27.109 cubic inches
>
> Converting cubic inches to ounces;
>
> 1.80468751 cubic inches per ounce
>
> = 15.021 ounces.
>
> Why then do you calibrate with 16 ounces?
>
> Want to make sure I get this right before I go mount it on the pole!
>
> Thanks!
>
> Clay
>
>
>
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