Capacitive sensors can detect metal and non-conductive materials - Boyang Intelligent

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Capacitive sensors can detect metal and non-conductive materials - Boyang Intelligent [Copy link]

　　Capacitive sensors can detect metals and non-conductive materials. Think of viscose, as well as water-based liquids such as (petroleum) oil and water or various other solids such as plastic, stainless steel, brass, cardboard and animal materials such as leather. These are just a few of the many possible substances. Alternatively, liquid product detection can be used to detect the presence of grain in a feed silo, for example, as a level measurement or full and empty load detection. The shape and color of the object have no influence on the result.

　　How do capacitive sensors work?

　　Capacitive sensors work almost the same way as inductive sensors. The sensor is "looking at" an active capacitive field (also called a dielectric). When that field changes, the sensor detects it. In many cases, the air is a constant, and when an object approaches the sensor, the capacitive field changes. The object passing through the sensor is denser than the air, so the sensor switches.

　　Mounting inductive and capacitive sensors:

　　There are two types of mounting for inductive and capacitive sensors: flush and non-flush. The mounting method may vary depending on the sensor model. How the sensor is mounted in your application affects its detection range and the time it takes to detect an object.

　　In a flush mount, the sensor is mounted so that the sensor head is flush with the mounting surface. In a non-flush mount, the sensor head protrudes from the mounting surface. This will have a direct impact on detection: A flush mounted sensor will only detect objects that are directly in front of the sensor head. A non-flush mounted sensor will also be interrupted by objects that appear to the side of the sensor head. This type of sensor can achieve a larger detection range.

　　Inductive sensor applications:

　　To further explain the difference between inductive and capacitive sensors, here is more information about inductive sensors. As mentioned before, inductive sensors, also known as proximity switches, are a simple, reliable, and low-cost solution for determining the position or location of a terminal. As such, there are countless application examples, such as:

　　· Elevator to floor;

　　Conveyor belts passing through specific locations;

　　·Car wash installation, determine the end and start points;

　　Bridge crane, determine the starting point or end point;

　　Detect metal strips as encoders to determine position.