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Fluid Level Detectors / Monitors
Last Updated on:
Monday, August 18, 2008 04:17 PM
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| Circuits Designed by Dave Johnson, P.E. : |
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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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Precision Low Capacitance Meter
NEW
This circuit was originally designed to measure the volume of the
fluid inside a 10cc syringe. It used two copper foil strips attached
to the outside barrel of the syringe. The fluid between the two
copper strips increases the capacitance. As the fluid volume decreased,
the capacitance also decreased. With the circuit shown below, it is
possible to calibrate the circuit, so the voltage produced is proportional
to the fluid volume inside the syringe. With the values shown, the
circuit produces a 5v DC output,...
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