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Fluid Level Detectors / Monitors
 Last Updated on: Friday, April 25, 2008 04:55 PM
Circuits Designed by Dave Johnson, P.E. :

  • CAPACITANCE TYPE LIQUID LEVEL MONITOR
    This circuit was originally designed to monitor the level of liquid natural gas in a tank but it can be used to also measure almost any liquid. Two custom insulated metal tubes form a capacitor plate. The capacitance between the two tubes increases as the level of the liquid rises. The circuit converts an increase of capacitance into a positive voltage change. The circuit could be changed to handle almost any scale factor needed.

  • Low Value Capacitance Meter
    This circuit was originally designed to measure the volume of fluid inside a medical syringe.   As designed, it produces a zero to 5 volt output, corresponding to a capacitance change of about 10 picofarads.  With a digital voltmeter, at its output, it can resolve a capacitance change of 0.002 picofarads or 2 femtofarads.
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

AB-10: Fluid Level Control Systems Utilizing the LM1830:  National Semiconductor - Application Note   (added 2/06)

Fluid Level Control Systems Utilizing the LM1830:  National Semiconductor - Application Note   (added 2/06)

Fluid Level Detector #1:  (added 10/02)

Fluid Level Detector #2:  (Electronic Circuit / Schematic added 10/04)

Sonarlike method detects fluid level:  07/19/01 EDN Design Ideas  /  (added 1/05)  Figure 1 illustrates a simple, cost-effective method of measuring the height of fluid in a column by using ultrasonic waves. Two piezoelectric transducers generate and listen to the ultrasonic acoustical wave. First, the transmitter piezo element receives stimulation from a square wave that lasts three or four cycles....

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