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Last Updated on: Thursday, April 07, 2016 02:04 PM

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Fluid/Liquid Level Dectector

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 . . . [Hobby Circuit designed by David Johnson P.E.,  06/13/00]


Doggie Water Dispenser Alarm  -  I have two Beagle dogs.  They drink a lot of water; they go through about 3 gallons a week.  They have two water dispensers.  One is on the inside and second unit on the outside of my house.  Often, I forget to fill one of their two jugs and discover them completely empty.  I do worry that my dogs might get dehydrated if I ever forget to fill both of their containers . . . [Circuit by David Johnson P.E.,  06/03/12]

Fluid 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 . . . [Circuit by David A. Johnson P.E.,  06/13/00]


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 . . . [Circuit by David A. Johnson P.E.,  12/12/04]


Precision Low 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 . . . [Hobby Circuit designed by David Johnson P.E.,  12/12/04]


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