Classification of China proximity switch:
Commonly used China proximity switch is divided into the following types according to different principles and different perception methods of objects:
1. Passive proximity switch
This China proximity switch does not require a power supply and controls the closed state of the switch through magnetic induction. When a magnetic object or a ferrous trigger is close to the magnetic field of the switch, the internal magnetic force of the switch controls the closing or opening.
2. Inductive proximity switch
When the conductive object moves near the China proximity switch, due to electromagnetic induction, an eddy current is generated inside the conductive object. This eddy current reacts to the proximity switch and changes the internal parameters of the switch, thereby sensing whether a conductive object is approaching and further controlling the on-off of the switch.

3. Capacitive proximity switch
The measurement of this China proximity switch is usually one plate that makes up the capacitor, while the other plate is the housing of the switch. This enclosure is usually grounded or connected to the device's enclosure during measurements. When an object moves to the proximity switch, no matter whether it is a conductor or not, due to its proximity, the dielectric constant of the capacitor will always change, so that the capacitance will change, and the state of the circuit connected to the measuring head will also change, so that the switch can be turned on or off. The objects detected by this China proximity switch is not limited to conductors, but liquids or powders that can be insulated.
4. Hall proximity switch
When a magnetic object approaches the China proximity switch, the Hall element on the detection surface of the switch changes the state of the internal circuit of the switch due to the Hall effect, thereby identifying the presence of a magnetic object nearby, and then controlling the on or off of the switch. The detection object of this China proximity switch must be a magnetic object.
5. Photoelectric switch
A switch made of the photoelectric effect is called a photoelectric switch. The light-emitting device and the optoelectronic device are installed in the same detection head according to a certain direction. When a reflective surface (object to be detected) approaches, the photoelectric device will output a signal after receiving the reflected light, so that an object can be sensed approaching.