What does a proximity switch look like? What are the precautions for use?
What does a proximity switch look like? What are the precautions for use?
The proximity switch, also known as the non-contact travel switch, is not only a non-contact detection device that can complete the stroke control and limit level protection, which is used to detect the size and speed of the part, but also can be used for the automatic connection of frequency conversion counters, frequency conversion pulse generators, liquid level control and processing programs. It has the characteristics of reliable work, long life, low power consumption, high reset accuracy, high working frequency, and adaptation to harsh working environment.
In general industrial production sites, eddy current remote proximity switches and capacitive proximity switches are commonly used. This is because these two proximity switches do not have high environmental requirements.
When the measured object is a conductive object or an object that can be fixed on a metal object, an eddy current proximity switch is usually used because of its high response frequency, good anti-environmental interference performance, and wide range of applications. The price is lower.
If the object is non-metal (or metal), liquid level, powder height, plastic, tobacco, etc. Capacitive proximity switches should be used. The switch has a low response frequency but good stability. Environmental factors should be taken into account when installing.
If the object to be measured is a magnetically permeable material or a magnet is embedded in the object to be measured in order to distinguish it from an object moving together, a low-cost Hall proximity switch should be used.
When the environmental conditions are good and there is no dust pollution, a photoelectric proximity switch can be used. When the photoelectric proximity switch operates, it has almost no effect on the object to be measured. Therefore, it is widely used in fax machines with high requirements for tobacco machinery.
In anti-theft systems, automatic doors usually use thermoelectric proximity switches, ultrasonic proximity switches, and microwave proximity switches. Sometimes, in order to increase the reliability of identification, the above proximity switches are often used in combination.
No matter what kind of proximity switch you choose, you should pay attention to the requirements of various indicators, such as working voltage, load current, response frequency, detection distance, etc.
Proximity sensors are widely used in aviation, aerospace, aerospace technology and industrial production. It is used in daily life, such as automatic doors in hotels, restaurants, garages, and automatic air heaters. In terms of security and anti-theft, anti-theft devices composed of various proximity switches are usually installed in important places such as data archives, accounting, finance, museums, and vaults. in measurement technology, such as the measurement of length and position; Proximity switches are also widely used in control technologies such as the measurement and control of displacement, velocity, and acceleration.
An inductive proximity switch is a sensor used for eddy flu response objects, which consists of a high-frequency oscillation circuit, an amplification circuit, a shaping circuit and an output circuit. An oscillator consists of a coil on a magnetic core and an LC oscillation circuit. Through the sensing surface of the sensor, the oscillator generates a high-frequency AC electromagnetic field in front of it. When a metal object is close to a magnetic field, an eddy current effect occurs within the metal object, resulting in the magnitude of the oscillation or the cessation of the oscillation of the LC oscillation circuit. Changes in the oscillator are amplified by the rear circuitry and converted into a defined switching output signal for non-contact detection.
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