Proximity switch is a kind of azimuth switch that can be operated without mechanical direct touch with moving parts, when the sensing surface of the object proximity switch to the action interval, it does not need mechanical touch and exerts any pressure to make the switch act, so as to drive DC electrical appliances or provide control instructions to computer (PLC) equipment. Proximity switch is a kind of switch sensor (i.e., non-contact switch), which has the characteristics of travel switch and micro switch, and has the sensing function, and the action is reliable, the function is stable, the frequency response is fast, the service life is long, the anti-interference can be strong, etc., and has the characteristics of waterproof, shockproof, corrosion resistance, etc. The products are inductive, capacitive, Hall, AC and DC types.
Proximity switches, also known as contactless proximity switches, are ideal electronic switching sensors. When the metal detector body is close to the sensing area of the switch, the switch can be no touch, no pressure, no sparks, quickly announce the electrical command, accurately reflect the orientation and stroke of the moving mechanism, even if it is used for general stroke control, its positioning accuracy, operation frequency, service life, convenience of installation and adjustment and application to harsh environment, is the general mechanical travel switch can not be compared. It is widely used in machine tools, metallurgy, chemical industry, textile and printing and other occupations. In the automatic control system, it can be used as a limit, counting, positioning control and automatic protection link.
Before we get into what capacitive proximity sensors can detect, let's take a look at how it works so that you have a clear idea.
The operating principle of capacitive proximity switches
Capacitive proximity switch also belongs to a kind of azimuth sensor with switching output, its measuring head is usually a plate that constitutes a capacitor, and the other plate is the object itself, when the object moves to the proximity switch, the dielectric constant of the object and the proximity switch changes, so that the circuit condition connected to the measuring head also changes, so that the switch can be switched on and off. Capacitive proximity sensors can detect any medium, including conductors, semiconductors, insulators, and even liquids and powders. For non-metallic objects, the interval between actions is determined by the dielectric constant of the material, and the larger the dielectric constant of the data, the larger the interval between actions that can be obtained.
What can capacitive proximity sensors detect?
Therefore, capacitive proximity sensors can not only detect metals, but also non-metallic substances such as plastics, glass, water, oil and other substances. When detecting non-metallic objects, the corresponding detection interval is different due to the influence of the conductivity, dielectric constant, volumetric water absorption and other parameters of the detected body, and the metal conductor grounded has the largest detection interval.
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