The proximity sensor, also known as the contactless proximity switch, is an ideal electronic switch sensor. When the metal detector is close to the sensing area of the switch, the switch can be contactless, no pressure, no pattern, quickly issue electronic instructions, accurately respond to the position and stroke of the action mechanism, and even in the ordinary stroke control can be realized, the stroke period accuracy, running frequency, service life, easy installation and adjustment, suitable for harsh environments, compared with the general mechanical travel switch, is comparable. It has a wide range of applications in machine tools, metallurgy, chemical industry, textile, printing and other industries. The system can be used as a link for limiting, counting, positioning control and automatic protection.
The proximity switch is a kind of switching sensor (i.e., non-contact switch), which has the characteristics of both travel switch and micro switch, and at the same time has the characteristics of inductive performance, reliable action, stable performance, fast frequency response, long service life, strong anti-interference ability, etc., and has the advantages of waterproof, shockproof, corrosion resistance, etc. The main products are inductive, capacitive, er, AC and DC.
The inductive proximity switch consists of three parts: an oscillator, a switching circuit and an amplification output circuit. This oscillator produces an alternating magnetic field. When the metal target in the gold target is close to the magnetic field and reaches the sensing distance, it will generate eddy currents, causing oscillation attenuation until the oscillation stops. The changes in the oscillator oscillation and stop oscillation are processed by the post-amplification circuit, and converted into a switching signal to trigger the drive control device, so as to realize non-contact detection.
Inductive proximity switches
Inductive sensors can be widely used for non-contact, high-precision position measurement of metal objects
Basic varieties: NBB, NBN, NEB, NCB, NJ, SJ, FJ, RJ, NMB series.
Shapes: cylindrical, rectangular, flat, grooved and annular shapes, VaiKont (head convertible).
Sensing range: 0. 2-100mm
Input: AC, DC, or AC/DC
Outputs: 2, 3 or 4-wire, normally open (NO), normally closed (NC), normally open and normally closed, and analogue output.
Output current: switching output (10-500mA), analog output (0-20mA).
Protection function: polarity protection, short circuit or overload protection, open circuit monitoring, overvoltage protection
Capacitive proximity switches
Capacitive sensors – can be used to detect all objects including metallic and non-metallic objects
Basic variety: CJ series
Shape: cylindrical, rectangular and flat.
Induction range: 1-40mm
Input: AC, DC, or AC/DC.
Output: Switching output normally open (NO) or normally closed (NC), 2, 3 or 4 wires.
Protection function: polarity protection, short circuit protection.
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