Several elements of two - wire proximity switch

How to choose different types of proximity switches

In general industrial production sites, eddy current proximity switches and capacitive proximity switches with lower environmental requirements are usually used.

When the measured object is a conductive object or an object that can be fixed on a piece of metal, the eddy current proximity switch is generally used. Because of its high response frequency and resistance to loops, if the measured object is non-metal (or metal), liquid level height, powder height, plastic, tobacco, etc., capacitive proximity switches should be used. Environmental factors should be considered when installing capacitive proximity switches.

If the measured object is a magnetic material or when the magnetic steel is buried in the measured object in order to distinguish the object moving with it, the lowest price Hall proximity switch should be used.

The photoelectric proximity switch can be used where the environmental conditions are relatively good and there is no dust pollution. The photoelectric proximity switch has almost no influence on the object under test when it is working. Therefore, in anti-theft systems, automatic doors usually use pyroelectric proximity switches, ultrasonic proximity switches, and microwave proximity switches. Sometimes in order to improve the reliability of recognition, the above-mentioned proximity switches are often used in combination. No matter which kind of proximity switch is selected, attention should be paid to the working voltage and load voltage.