"Ralph Mowery" wrote in message ...

"Todd" wrote in message
...
Hi All,

Have a farmer for a customer with a large water
tank for watering his fields. He would like some
telemetry as to its state: full, half full, etc..
(Currently he uses the "There She Blows!" method
to see when the tank is full.)

Anyone have any suggestions? Be nice if it worked
over Modbus/TCP.


Depends on how much he wants to spend. If the tank is open at the top he
can use a pressure transducer very easy. Here is one that operates over the
Modbus.
http://www2.emersonprocess.com/sitea...-0100-4738.pdf

Rosemont also makes single point switches. For that he will have to put a
hole in the tank at the levels he wants the switch to activate.

Drexelbrook makes some level measuring transmitters that operate on a 4 to
20 ma loop type circuit and other devices.

http://www.drexelbrook.com/Continuou...versal-IV.aspx


All depends on how much he wants to spend. He could put one of the point
level switches near the top and have it turn off the pump and anoter near
the bottom to turn the pump on.

I have used all brands of control equip and always steer clear of Emerson because everything is proprietary.