[wxqc] rain gauge question

[jim]

the sensor is 4 "wires / contacts"  that the drop falls through and makes
contact between at least 2 of them to "count" the drops. if you want to call
this a "lens" Ok
for lack of a better word. The reason I was wondering was we are in the
"monsoon season" here and I had the Tru-Check mounted next to my Electronic
rain gauge and it was measuring high, Electronic = .07, Tru-Check = .11.   I
have since re-mounted the tru-check because I could not get it completely
level next to my Electronic. I will see how close it is next time we have a
T-storm come through. I am thinking the Electronic is more accurate as long
as it is level.

Jim
CW4367
  -----Original Message-----
  From: wxqc-bounces at lists.gladstonefamily.net
[mailto:wxqc-bounces at lists.gladstonefamily.net]On Behalf Of Victor Engel
  Sent: Saturday, July 08, 2006 8:58 AM
  To: Discussion of weather data quality issues
  Subject: Re: [wxqc] rain gauge question


  I'm new to the electronic weather station business, but it seems to me
that a Tru-Chek gauge will not be a very good way to calibrate. It's surface
area is very small and consequently the precision is low.

  Siting is also very important. An accurate rain gauge is only as accurate
as the location/shelter where it's placed.

  Reading up on your gauge, it looks like it works by funneling all rain
into a drop counter. I suppose this would be dependent upon the cleanliness
of the lens that senses the drops as well as the surface tension of the
water. I bet if you washed your gauge with Dawn dishwashing detergent and
didn't rinse completely, your gauge would be way off. I wonder how much the
surface tension of rainwater actually varies....

  I'm just brainstorming here....


  On 7/8/06, jim <jimwc at frontiernet.net> wrote:
    to any one

    I was issued a Tru-Chek Rain gauge by the storm spotter coordinator in
my area. My question is: is it accurate enough to calibrate my Electronic
rain gauge to.
    My electronic rain gauge is a Peet Bros .01" pro rain gauge. or should I
invest in a different type for calibration purposes.

    Jim
    CW4367


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