Capacitive proximity sensors | for detection of metallic and non-metallic objects in automation control and monitoring systems

Capacitive proximity sensors are automation components designed to detect objects without physical contact. These sensors respond to changes in capacitance that occur when an object approaches the sensor surface. Capacitive sensors are known for their durability, high accuracy, and wide range of applications, making them an essential part of modern automation, industrial systems, and household equipment.

These sensors are universal – they can detect both metallic and non-metallic objects such as plastic, glass, wood, or liquids. Therefore, capacitive sensors are ideal for engineering systems as well as home applications where reliable, contactless detection is required.

Functions and operating principle
Capacitive sensors operate on the principle of capacitance change – when an object approaches the sensor’s active area, the electrical capacitance changes, and the sensor outputs a signal to the control system.

Main functions:

Detect metallic and non-metallic objects, including liquids.

Can operate through non-metallic walls, making them suitable for level measurement in tanks.

Send an electrical signal to an automation system, PLC, or relay.

Can be used in ON/OFF mode or for real-time signal control.

Applications:

For home users: Suitable for monitoring water or liquid levels, automatic doors, and home appliance automation.

For engineers: Used for process automation, quality control, production line management, and transport system monitoring.

For electricians: Easy to integrate, directly connectable to PLCs or logic controllers, with clearly marked wires and often an LED indicator for operation monitoring.

Advantages:

Contactless operation – no mechanical wear, long lifespan.

Versatility – detects various types of objects (metallic and non-metallic).

High sensitivity and adjustable detection distance.

Resistant to dust, moisture, and vibration.

Easy installation – cylindrical or square housings with standard threads.

Disadvantages:

Sensitive to environmental changes – humidity or temperature can slightly affect sensitivity.

Shorter detection range compared to inductive sensors for metal.

Capacitive proximity sensors are reliable, durable, and precise solutions for both industrial automation systems and home applications. They enable the detection of metallic and non-metallic objects without direct contact, ensuring high operating speed and long service life.

This product group is particularly relevant for automation engineers, installers, technicians, and system integrators seeking advanced and reliable solutions for object detection and process control.