The fast proximity switch is composed of three parts: oscillator, switch circuit and amplifying output circuit. The oscillator generates an alternating magnetic field. When the metal target approaches this magnetic field and reaches the sensing distance, an eddy current is generated in the metal target, which causes the oscillation to decay and even stops the vibration. The changes of the oscillator oscillation and stop oscillation are processed by the post-amplifier circuit and converted into a switch signal, which triggers the drive control device, so as to achieve the purpose of non-contact detection.
Proximity switch belongs to a kind of position sensor with switch output. According to the principle of I, it is divided into inductive and capacitive. Inductive proximity switch is composed of LC high-frequency oscillator and amplifying processing circuit. Metal objects are used to approach this When an oscillating induction head can generate an electromagnetic field, eddy currents are generated inside the object. This eddy current acts on the proximity switch to attenuate the oscillation ability of the proximity switch, and the parameters of the internal circuit change, thereby identifying whether there is a metal object approaching, and then controlling the on or off of the switch. The object that this proximity switch can detect must be a metal object, and the detection distance is from 0.8mm to 150mm. It can be made into a high temperature resistant proximity switch according to customer needs, with a maximum temperature of 150C.
The measuring head of a capacitive proximity switch 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, making the measurement The state of the circuit connected to the head also changes accordingly, so that the switch can be controlled on and off. The detection object of this kind of proximity switch is not limited to metal conductors, but can also be insulated liquid or powder objects. When detecting objects with a lower r electric constant ε, the multi-turn potentiometer (located at the rear of the switch) can be adjusted clockwise. ) To increase the sensitivity
Related Links The working principle of proximity switches The schematic diagram of inductive proximity switches
24v proximity switch physical wiring diagram_proximity switch schematic diagram_proximity switch maximum sensing distance-full text
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