Capacitive Fluid Level Sensor Circuit

The fluid level detector of the present design incorporates capacitive sensor means established relative to a fluid receptacle in a substantially fixed relation on the outside wall of the receptacle.

Capacitive fluid level sensor circuit.

Rigid flex circuit allows the sensors to be placed on various shaped surfaces. Fuel level washer fluid coolant level medical. Drug pens insulin pumps droplet. Level is the length submerged into liquid.

This is a capacitive sensor that utilized the fact that changes in liquid level alter the dielectric contant of plates attached to the fluid container when the plates are viewed as a capacitor. Capacitive fluid level sensor. The level capacitance can be simulated by entering the low and high level values. Thus the level of the liquid can be calculated as c 1 c 2.

When standard capacitive sensors are used for liquid level detection in an indirect level detection application the sensor must be adjusted to the point where it ignores the container wall but reliably detects the capacitance change caused by the changing liquid level. Typically a standard capacitive sensor can be adjusted to disregard a wall. Shows how to create a simple liquid level sensor using only a single probe. Demonstrating the working comparison of standard capacitive sensor and smart level capacitive sensor.

Capacitance units will calculate automatically the capacitance variation image based in the factory calibration for a conductivity 100 μs cm. The sensor is designed for use in various tank level applications including food equipment and mobile fluid containers and medical. While spring is over 6 months away from now it is pretty much autumn right now there is still plenty to do. This project a capacitive fluid level sensor from 1991.

Capacitive based liquid level sensing sensor reference design tidu736a january 2015 revised march 2015 8. A capacitive liquid sponsor relies on the fact the the capacitance or charge between 2 metal plates will change in this case increase depending on what material is between them. This allows us to create a level sensor that is safe for use with any liquid this one will be used in a buggy with gasoline petrol. Since εr water εr air the capacitance of the sensor can be approximated by the capacitance of the submerged section.

For the next spring i plan to make a fully automatic hydroponic setup. The capacitive sensor can be made to be an integral part of a printed circuit containing electronic detection circuitry thereby making the device. International association of oil gas. Figure capacitance level sensor calibration.