Capacitive Oil Level Sensor Circuit

Proven in motorsport defence and industrial applications the sensors are solid state with no moving parts.

Capacitive oil level sensor circuit.

A second pair of capacitive sensors shown as c 2 is used as a reference. The level capacitance can be simulated by entering the low and high level values. International association of oil gas. When the tube starts to fill more and more of the space will be occupied by water.

Since εr water εr air the capacitance of the sensor can be approximated by the capacitance of the submerged section. 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. Two concentric aluminum tubes along the length of the sensor form a variable capacitance circuit. Figure capacitance level sensor calibration.

How it works and how to make a capacitive water or fluid level sensor for your fish tank water collection oil or fuel tanks cutting oil in machine tools. In the most basic sense capacitors store electrostatic energy in an electric field. 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. When the tube is empty the space is occupied by air.

When functioning as level sensors capacitors work by processing capacitance with reference to the dielectric. The optomax industrial glass sensor is known to be a good alternative to gems range of capacitance oil level sensors and switches. Thus the level of the liquid can be calculated as c 1 c 2. Capacitance units will calculate automatically the capacitance variation image based in the factory calibration for a conductivity 100 μs cm.

The optomax industrial glass range is the ideal solution for applications such as power generation equipment off highway vehicles generators food and beverage medical rail hvac and coolant monitoring. The tube electrodes are isolated from each other using a molded rytontm insulator. The space between the tubes is the dielectric. Designed and developed to measure oil level reliably in extreme operating conditions.

All products are manufactured to suit the intended application whether using one of our standard designs manufactured to length or a fully bespoke sensor designed specifically for the application. The capacitive level sensor has the 2 conducting plates in the form of 2 electrically isolated aluminium tubes a smaller tube in a larger tube. Each oil level sensor is manufactured to the required mechanical specification. Level is the length submerged into liquid.

The capacitance level sensor produces a dc current signal proportional to fluid level when excited with 20 vac at 30 khz.