Simple Fluid Level Sensor Circuit

For all electrically conductive Fluid or liquid level measurement, this single-chip circuit is very compact and simple. This circuit is a voltage level sensor encouraged the AC bias supply for the sensor to prevent the electrolysis of the probes used.

Simple Fluid Level Sensor Circuit

This AC excitation, the sensor has a longer life. This circuit is useful for a wide range of water or liquid level measurement and control, heat registers, vending machines, washing machines, water softener, irrigation, reservoir, tank, aquarium or  pumps.

Many types of liquids are electrically conductive and can track by using this level sensor: City / groundwater, seawater, Chopper solution, weak acid, weak base, household ammonia, water and glycol mixture, wet soil, coffee and juices.

Remember that most of the fuel is not electrically conductive, so that this circuit can be used as a fuel level sensor assembly / detector. Some other non-conductive liquid are: pure water, gasoline, oil, brake fluid, alcohol, ethylene glycol, paraffin, dry soil, and whiskey. The following figure shows the schematic of the circuit.


  1. Wow this such a great article and the tips are very comprehensive. For sure many entrepreneurs with small and big businesses are going to benefit from this. Keep it up!
    Level Switch


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