Precautions for use of proximity switch

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【概要描述】The proximity switch, also known as contactless proximity switch, is an ideal electronic switch sensor. When the metal detector approaches the sensing area of the switch, the switch can send out electrical instructions without contact, pressure and spark, and accurately reflect the position and travel of the moving mechanism. That is, it is used for general travel control. Its positioning accuracy, operating frequency, service life, convenience of installation and adjustment, and adaptability to harsh environment, It is incomparable with general mechanical travel switch. It is widely used in machine tool, metallurgy, chemical industry, light textile, printing and other industries. It can be used as limit, count, positioning control and automatic protection link in automatic control system. In general industrial production sites, eddy current proximity switches and capacitive proximity switches are usually selected because of the low environmental requirements of these two proximity switches. When the measured object is a conductive object or an object that can be fixed on a metal object, eddy current proximity switches are generally selected because of its high response frequency, good environmental interference resistance, wide application range and low price. If the measured object is non-metal (or metal), liquid level height, powder height, plastic, tobacco, etc., the capacitive proximity switch should be selected. The response frequency of this switch is low, but the stability is good. The impact of environmental factors should be considered during installation. If the measured object is magnetic material or magnetic steel is buried in the measured object in order to distinguish the object moving with it, the Hall proximity switch should be selected. Its price is low. Photoelectric proximity switches can be used in places with good environmental conditions and no dust pollution. When the photoelectric proximity switch works, it has almost no impact on the tested object. Therefore, it is widely used in fax machines with high requirements and tobacco machinery. In the anti-theft system, pyroelectric proximity switch, ultrasonic proximity switch and microwave proximity switch are usually used for automatic doors. Sometimes, in order to improve the reliability of identification, the above proximity switches are often used in combination. Regardless of which proximity switch is selected, attention should be paid to the requirements for working voltage, load current, response frequency, detection distance and other indicators.

The proximity switch, also known as contactless proximity switch, is an ideal electronic switch sensor. When the metal detector approaches the sensing area of the switch, the switch can send out electrical instructions without contact, pressure and spark, and accurately reflect the position and travel of the moving mechanism. That is, it is used for general travel control. Its positioning accuracy, operating frequency, service life, convenience of installation and adjustment, and adaptability to harsh environment, It is incomparable with general mechanical travel switch. It is widely used in machine tool, metallurgy, chemical industry, light textile, printing and other industries. It can be used as limit, count, positioning control and automatic protection link in automatic control system.
In general industrial production sites, eddy current proximity switches and capacitive proximity switches are usually selected because of the low environmental requirements of these two proximity switches. When the measured object is a conductive object or an object that can be fixed on a metal object, eddy current proximity switches are generally selected because of its high response frequency, good environmental interference resistance, wide application range and low price.
If the measured object is non-metal (or metal), liquid level height, powder height, plastic, tobacco, etc., the capacitive proximity switch should be selected. The response frequency of this switch is low, but the stability is good. The impact of environmental factors should be considered during installation. If the measured object is magnetic material or magnetic steel is buried in the measured object in order to distinguish the object moving with it, the Hall proximity switch should be selected. Its price is low.
Photoelectric proximity switches can be used in places with good environmental conditions and no dust pollution. When the photoelectric proximity switch works, it has almost no impact on the tested object. Therefore, it is widely used in fax machines with high requirements and tobacco machinery.
In the anti-theft system, pyroelectric proximity switch, ultrasonic proximity switch and microwave proximity switch are usually used for automatic doors. Sometimes, in order to improve the reliability of identification, the above proximity switches are often used in combination. Regardless of which proximity switch is selected, attention should be paid to the requirements for working voltage, load current, response frequency, detection distance and other indicators.

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