Today, Wuxi Rihuan Sensing Technology Co., Ltd. will introduce to you the capacitive proximity switch: a comprehensive analysis including detection of media, principle and applications. 

I. Basic Definition of Proximity Switch

A proximity switch is a position switch that can operate without direct mechanical contact with the moving parts. When an object approaches the sensing surface to within the action distance, it can trigger the action without contact or pressure, and can drive DC electrical appliances or send control instructions to a computer (plc). As a non-contact switch-type sensor, it combines the characteristics and sensing functions of a travel switch and a microswitch, and has reliable operation, stable performance, fast frequency response, long service life, strong anti-interference ability, and advantages such as waterproof, shockproof, and corrosion resistance. Common types include inductive, capacitive, Hall, and AC/DC types.

II. Working Principle of Capacitive Proximity Switch

The sensing capacitance proximity switch of Rihuan belongs to a position sensor with switch output. The measuring head is one of the plates of a capacitor, while the object being detected serves as the other plate. When the object approaches the proximity switch, the dielectric constant between the object and the switch changes, which will cause the circuit connected to the measuring head to change its state, thereby achieving the control of the switch's on and off.

III. Core Detection Range

The Rihuan sensing capacitance proximity switch REB-DRM can detect various media, including conductors, semiconductors, and insulators. It can also be used to detect liquids and powdered materials. It can not only detect metals but also effectively detect non-metallic substances such as plastics, glass, water, and oil. It should be noted that when detecting non-metallic objects, the detection distance will vary due to the influence of parameters such as the conductivity, dielectric constant, and volume water absorption rate of the detection object. Among them, the maximum detection distance can be achieved for grounded metal conductors, and its main application in practical use is to detect non-metallic substances. 

IV. Industry Application Scenarios

This type of proximity switch is widely used in various industries such as machine tools, metallurgy, chemical industry, textile, and printing. In the automatic control system, it can undertake key functions such as positioning, counting, positioning control, and automatic protection.

If you need to know more about the product details, you can call the official customer service hotline of Rihuan Sensing at 400-004-0510 for consultation!