[aprssig] water level gauge for APRS
Steve Noskowicz
noskosteve at yahoo.com
Mon Oct 5 08:53:22 EDT 2015
Notice that the water thing worked out sort of close to 2 mmHg per water-inch depth...
--
Regards, Steve Noskowicz
Science & Technical Advisor
http://www.challengerillinois.org/
--------------------------------------------
On Mon, 10/5/15, Steve Noskowicz via aprssig <aprssig at tapr.org> wrote:
Subject: Re: [aprssig] water level gauge for APRS
To: "TAPR APRS Mailing List" <aprssig at tapr.org>, "Robert Bruninga" <bruninga at usna.edu>
Date: Monday, October 5, 2015, 12:18 AM
FWIW.
Some idea fodder in addition to
the other things mentined,:
A lot depends on just how much level change you
consider to be a "flood".
Floats are pretty simple. Every auto gas tank
has (had) one inside, I think.
A sealed pipe is used in homes to eliminate
the hydrolic hammering. These need periodic flushing
because gasses disolve in the water and the level goes up
with the constant pressure against the decreasing amount of
gas. When they fill, no more bumper.
If the
'flood gage' is usually empty, then no problem...
I don't know if this gives
anyone ideas, but...
A
friend has a very clever commercial fuel tank guage in his
boat. I had the web page for it, but not now...
A tube in the tank goes to the bottom, but is
open on the bottom.
A hand pump pumps air
into the tube.
An analog, barometer-style
mechanical pressure guage (just like on a BP cuff) on the
pump shows the pressure at the pump and, therefore, top of
the tube.
When the tube bubbles out the
bottom, the pressure stops building and you read the
depth. The guage is calibrated for the liquid. I did the
calculations for water and compared my results with the
pressure guage on my sphygmomanometer (BP cuff)
Pretty slick.
Paper
describing in more detail
http://hemingways.org/Yandina/Temp/fuelgauge.pdf
Commercial:
http://levelcom.net/
I found my calculations, but
no indication of the specific company...
The
conversion:
mm Hg
Inch Hg mmH2O
Inches H20
1.868320156 0.073555912
25.39999984 1.0
I
played with this measurement as well as a U-Tube
Manometer.... The slanted version can give much more low
pressure variation for an ultrasonic sensor.
U-Tube manometer
calculations:
http://www.engineeringtoolbox.com/u-tube-manometer-d_611.html
Be careful with the Engineering
Toolbox. I found a few places where it is a little sloppy
in its stuff..
These don't have the
disolved gas problem.
There
is a USGS guage station at the inlet of Wonder Lake that
measures water height, rain and other things. I have no
idea how it works. Next time I see the guy servicing it,
I'll ask more.
http://waterdata.usgs.gov/usa/nwis/uv?05548105
--
Regards, Steve Noskowicz
Science & Technical Advisor
http://www.challengerillinois.org/
--------------------------------------------
On Sun, 10/4/15, Robert Bruninga via aprssig
<aprssig at tapr.org>
wrote:
Subject: [aprssig]
water level gauge for APRS
To: "TAPR
APRS Mailing List" <aprssig at tapr.org>
Date: Sunday, October 4, 2015, 9:03 PM
TO
make a
flood gage, it would seem that a simply pressure
sensor like we use for atomosphere for balloon
payloads
would work.
Just put it inside a pipe with a cap on the
top and
open on the bottom. Then the
pressure will vary with the
height of the
water. Connect this to the analog input of
an APRS tracker and you have a flood gage.
Calibate it
with some testing and
done...
ANyone done
this?
Bob
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