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Shandong Zhongfa Industrial specializes in importing European and American imported parts from Germany, the United States, Italy, and other countries; Main products: Industrial spare parts, mechanical and electrical components, commonly used instruments and meters, mechanical equipment, etc.

Main categories

Because displacement sensors can be made according to different principles and methods, and different displacement sensors have different "perception" methods for objects, there are several common proximity switches:

Passive proximity switch

This type of switch does not require a power supply, and its closed state is controlled by magnetic induction. When the magnetic or iron trigger approaches the switch magnetic field, it controls the closure by interacting with the internal magnetic force of the switch. Features: No need for power supply, non-contact, maintenance free, environmentally friendly.

Eddy current proximity switch

This type of switch is sometimes called an inductive proximity switch. It uses conductive objects to generate eddy currents inside the object when approaching the proximity switch that can generate an electromagnetic field. This eddy current reacts with the proximity switch, causing changes in the internal circuit parameters of the switch, thereby identifying the presence or absence of conductive objects moving closer and controlling the on or off of the switch. The object that this proximity switch can detect must be a conductive material.

1. Principle: The oscillator is composed of an inductor, a capacitor, and a transistor, and generates an alternating magnetic field. When a metal object approaches this magnetic field, eddy currents are generated inside the metal object, causing the oscillation to stop. This change is amplified by the back pole and converted into a transistor switch signal output.

2. Features: A. Good anti-interference performance, high switching frequency, greater than 200 Hz B. Can only sense metals.

3. Applied to various mechanical equipment for position detection, counting signal picking, etc.

Capacitive proximity switch

The measurement of this type of switch usually involves one electrode of the capacitor, while the other electrode is the outer shell of the switch. This casing is usually grounded or connected to the device casing during the measurement process. When an object moves towards a proximity switch, regardless of whether it is a conductor or not, its proximity always causes a change in the dielectric constant of the capacitor, resulting in a change in capacitance and a change in the state of the circuit connected to the measuring head. This allows for the control of the switch's on or off state. The objects detected by this proximity switch are not limited to conductors, but can also be insulating liquids or powders.