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Fluid Level Detectors / Monitors Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Monday, April 21, 2008 04:19 AM

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  • 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.


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