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Sensors / Detectors: Liquid Detectors
Sensors / Detectors -- Main Page
Last Updated on: Friday, October 16, 2009 03:42 AM


Circuits designed by Dave Johnson, P.E. :
  • Electrodeless Water Level Monitor
    This system operates much like a classic float switch but without any moving parts.  The illustration shows how a system using two copper coils sealed inside a plastic pipe, can detect the level of water outside the pipe.  Whenever the water level is lower than the upper coil, no signal is coupled between the coils.  Once calibrated, this technique might also work on the outside of a plastic water tank.  (added 7/06)
  • Water Flowing in Pipe Indicator -- July 6, 2009
    The vibrations associated with water flowing through a pipe are picked up by an inexpensive piezoelectric wafer.  The signal from the wafer is first boosted by a micropower transistor amplifier and then fed to an ultra low power voltage comparator.   When the vibration signal has sufficient amplitude, a FET transistor switch is activated.  Drawing only 6uA, the whole circuit is powered by a lithium coin battery, which should power the circuit for many years....
  • WATER SEEPAGE ALARM
    This simple circuit sounds a beeper when its electrodes detect water. A single 1.5v N cell powers it. A small 1.5v button battery will also work.
 
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
12 Volt Toilet Tank Refiller - (circuit design added 8/03)
Adjustment Free Inclinometer operates on 27V - 04/24/97 EDN-Design Ideas: (design idea added 3/03)
AN1013: Gas & Water Metering with the PIC16F91X Family - Microchip Application Note Published 20-Jan-06  (app note added 2/06)
Circuit provides ISFET Sensor Bias - 06/10/04 EDN-Design Ideas: ISFETs (ion-sensitive field-effect transistors)are useful for measuring the acidity of fluids. Accurate measurements require that the ISFET's bias conditions (ID and VDS)be held constant while the gate is exposed to the fluid under test. The acidity of the fluid changes the channel width, resulting in a gate-source voltage, VGS,.....(design idea added 11/05)
Fluid Level Detector (Tony van Roon) - (electronic schematic / circuit added 4/02)
Fluid Sensor & More -  It Can Detect Most Liquids and more....(design added 12/08)
One wire bus powers water level sensor - 02/15/00 EDN-Design Ideas: remotely monitor the level of liquid water in a vessel such as a swimming pool.....(design idea added 2/06)
Piezo crystal monitors liquid level - 03/30/00 EDN-Design Ideas:.....(design idea added 11/05)
Water Level Control/Monitor - A simple way to control the level of any liquid in any container. (electronic schematic added 05/04)
Water-level Alert - Beeper or flashing LED alert.  (electronic design added 6/07)
Water-Level Controller - (electronic Circuit / Schematic added 10/04)
Water-level Indicator - The whole project was developed on a friend's request. Its purpose was to remotely monitor the water-level in a metal tank located in the attic by means of a very simple control unit placed in the kitchen, some floors below. ….(electronic schematic added 11/08)
Water-level Sensing & Control - (Tony van Roon's circuit design added 8/03)

 
 
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