Different classifications of China proximity sensors:
China proximity sensors are classified according to their working principles: high-frequency oscillation type, capacitive type, induction bridge type, permanent magnet type and Hall effect type.
China proximity sensors can be divided into three categories according to the operating principle: high-frequency oscillation type using electromagnetic induction, magnetic type using magnets, and capacitive type using capacitance changes.

China proximity sensors are classified according to detection methods:
Universal type: mainly detect ferrous metals (iron)
All Metal Types: Detects any metal within the same detection distance.
Non-ferrous metal type: mainly detect non-ferrous metals such as aluminum
China proximity sensors are classified according to the structure type:
1. Two-wire proximity sensor:
The two-wire proximity sensor is easy to install and easy to connect; it is widely used, but has the disadvantages of large residual voltage and leakage current.
2. DC three-wire type:
There are two output types of DC three-wire proximity sensor: NPN and PNP. PNP output proximity sensors are generally used in PLCs or computers as control instructions, and NPN output proximity sensors are used to control DC relays. In practical applications, the output form should be selected according to the characteristics of the control circuit.
The above is the classification of China proximity sensors.