Water Level Sensor Circuit Using LM1830 Single Chip

This is a water sensor circuit design using based on a Conductive Liquid Level Sensor, this single chip circuit is very compact and simple. This circuit is an ac excited fluid level sensor, which uses alternating current to provide biasing for the sensor probe to avoid electrolysis of the probes. This ac excitation makes the sensing probe has long
Water Level Sensor Circuit Using LM1830 Single Chip - schematic

er lifetime. This circuit can be useful for wide range of water or liquid level sensing and control such as radiators, beverage dispensers, washing machines, water softeners, irrigation, reservoirs, boilers, aquarium, or sump pumps Many type of fluids are electrically conductive and can be detected using this liquid level sensor circuit: city water/ground water, sea water, chopper sulfate solution, weak acid, weak base, household ammonia, water and glycol mixture, wet soil, coffee, or fruit juices. Remember that most of fuel doesn`t conduct electricity, so this circuit can be employed as fuel level sensor/detector. This is the figure of the circuit. If we look at its data sheet, this water level sensor circuit chip is best at 10-24 volt supply voltage. The absolute maximum voltage supply for this liquid level sensor chip is 28V, but remembers to always try to avoid this extreme condition to prevent damaging the chip. In the first circuit, a basic low level warning application uses a LED to indicate the water level falls below the sensor. You can see the filter pin (9) is not connected, this means that the LED is actually blinking at sound frequency, but it`s fine since our eye response is slow enough to notice such high speed blinking. Since without filter capacitor at pin 9 the output give a square wave signal, you can easily replace the led with loud speaker as shown in the second circuit to give audio indication. If you...

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