program them up for a wide range. Best thing was if you only knew a rough
idea of how much pressure it would take, we could empty the tank or set it
to the low level limit and press a button, then fill it to where we wanted
to call a full level and press another button and it was then calibrated to
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On Thu, 30 Oct 2014 07:13:17 -0700 (PDT), email@example.com wrote:
That works a lot better in a washing machine than it would in a tank
of water if the water never drops below the end of the hose (like it
does a few times a cycle in a washer)
Eventually the trapped air in the hose is absorbed in the water and
the water level rises in the hose, giving you a low reading.
It would work if the hose was sealed and you had something like an ear
syringe for a bladder in the bottom of the tank.
It is better just to use a water proof pressure sensor at the bottom,
On Wed, 29 Oct 2014 18:29:52 +0000 (UTC), "Danny D."
The local water district uses several methods. All tanks have a float
and a rope pully, so that anyone can walk up to the tank and see the
water level. They are also part of a SCADA (supervisory control and
data aquisition) system that monitors the entire water system and
displays operating data on a cool looking flow chart display. For a
given tank, it's not just the water level that is monitored. As I
vaguely recall from memory, there's the flow rates (both in and out),
water acidity (for chlorination), current (for cathodic protection)
and pump monitoring. Control signals also go the other direction, for
turning things on and off. The data is sent back to the district
offices via a mix of packet radio, land lines, and cellular data. I
suspect the OP doesn't need or want this level of complexity.
Start with an ultrasonic level meter:
<https://www.google.com/#q=ultrasonic+water+tank+level+meter Plenty to choose from and fairly cheap. They usually have an RS-232
or RS-485 output which can be sent to a packet radio transmitter. I
can't offer specific radio or data collection system suggestions
without knowing something about the location and available resources.
Jeff Liebermann firstname.lastname@example.org
150 Felker St #D http://www.LearnByDestroying.com
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