Electronics > Projects, Designs, and Technical Stuff

River water level

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langwadt:

--- Quote from: Gregg on June 30, 2019, 12:52:27 am ---How about an aquarium air pump, a pressure transducer and a small tube to the bottom of the water.  The pressure is directly proportional to the depth of the water.  The pump and transducer can be located wherever convenient to power and the whole setup is quite foolproof.   :-/O

--- End quote ---

just use a differential pressure transducer, one side to atmosphere other to bottom of water

max_torque:

--- Quote from: langwadt on June 30, 2019, 01:10:58 am ---
--- Quote from: Gregg on June 30, 2019, 12:52:27 am ---How about an aquarium air pump, a pressure transducer and a small tube to the bottom of the water.  The pressure is directly proportional to the depth of the water.  The pump and transducer can be located wherever convenient to power and the whole setup is quite foolproof.   :-/O

--- End quote ---

just use a differential pressure transducer, one side to atmosphere other to bottom of water

--- End quote ---

The pumped system does have the advantage that it clears any blockages in the pipework or entry point, although the diff pressure could be easily achieved via some form of "hydraulic" transfer, ie, a silicon / mineral oil filled "void" around the pressure sensor, with some form of flexible diaphragm separating the water and oil, so that oil transfers the pressure straight to the sensor! 

Rerouter:
The river level sensors used in rural areas of australia use a piezoelectric resonator connected to a finger of metal, the more water pressure, the more resistance to the vibration, and you measure the frequency output to know your pressure,

They tend to be oscillating in the 44-150Hz range to keep power low, but swing things up with a high power ultrasonic driver every few days as a cleaning cycle.

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