How does the inductive proximity switch work

Proximity Switch (Proximity Switch) is a sensor that can detect the proximity of objects nearby, and it is commonly used in industrial sites. As the name suggests, as a switch (Switch), it can output two results of 0 or 1. According to different working principles, proximity switches can be divided into two types: inductive and photoelectric (mainly infrared, Infrared).

Today in this article, we will talk to you about the working principle of inductive proximity switches.

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Let's first understand the appearance of the inductive proximity switch.

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Inductive proximity switches work differently when they contact ferrous metals and non-ferrous metals.

The inductive proximity switch generates a high-frequency magnetic field on its front surface through its internal oscillation circuit. When ferrous metal approaches it, the ferrous metal is easily magnetized. The process of magnetization will absorb the energy of the high-frequency magnetic field.

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As the ferrous metal approaches the proximity switch, the higher the degree of magnetization of the metal, the more energy of the high-frequency magnetic field is absorbed. This leads to an increasing load on the internal oscillation circuit of the proximity switch, and finally the oscillation circuit decays or stops. The detection circuit inside the proximity switch can detect changes in the state of the oscillation circuit, thereby changing the output state, and changing the signal value of the proximity switch from 0 to 1. The waveform of the oscillation circuit before and after contact with ferrous metal

You can refer to the picture below:

Encoder|Transmitter|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

When non-ferrous metals (such as aluminum, copper, etc.) approach the inductive proximity switch, they do not absorb the energy of the high-frequency magnetic field. On the contrary, this kind of metal can also increase the frequency of the internal oscillation circuit of the proximity switch. The internal detection circuit can also detect this change, thereby changing the output state and changing the signal value of the proximity switch from 0 to 1. The waveform of the oscillation circuit before and after contacting non-ferrous metals can be seen in the following picture:

Encoder|Transmitter|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

Well, the working principle of the inductive proximity switch is introduced here.