The proximity switch DW-A-603-M30 is widely used in industries such as machinery, textiles, light industry, metallurgy, papermaking, printing, packaging, tobacco, electricity, mining, railways, aerospace, and military. Waterproof, shock resistant, corrosion-resistant, with more than ten series and over a thousand models. The proximity switch W-A-603-M30 is actually a switch type sensor that utilizes the saturation and cutoff of a transistor to output two states. But the output signal is completely opposite, that is, level and level. PNP output is at level 0, NPN output is at level 1. A detailed description of the difference between a proximity switch and a similar type of proximity switch: A proximity switch, also known as a contactless travel switch, is not only capable of performing travel control and limit protection, but also a non-contact detection device used for detecting part size and speed measurement. It can also be used for variable frequency counters, variable frequency pulse generators, liquid level control, and automatic connection of machining programs. The characteristics include reliable operation, long lifespan, power consumption, repositioning, operating frequency, and adaptability to harsh working environments. In various types of switches, there is a type of switch that has a sensitivity to objects approaching it; lquo; The element of perception ability is the displacement sensor. The use of displacement sensors to control the on or off of proximity switches based on the characteristics of approaching objects is called proximity switches. When an object moves towards the proximity switch and approaches a certain distance, the displacement sensor only has a& lquo; Perception "is the only way the switch will act. This distance is usually called" detection distance ". Different proximity switches have different detection distances. Sometimes the detected object moves towards the proximity switch one by one and then leaves one by one at a certain time interval, repeating this process. Different proximity switches have different response capabilities to the detected object. This response characteristic is called" response frequency ". Because displacement sensors can be made according to different principles and methods, and different displacement sensors have different effects on the object; The methods of perception are also different, so there are several common types of proximity switches:
1. Eddy current proximity switch
This type of switch is sometimes called an inductive proximity switch. It uses a conductive object to generate an electromagnetic field when approaching the proximity switch, causing eddy currents inside the object. This eddy current reacts with the proximity switch, causing changes in the internal circuit parameters of the switch, thereby identifying whether a conductive object is moving closer and controlling the on or off of the switch. The object that this proximity switch can detect is a conductive object.
2. Capacitive proximity switch
The measurement of this type of switch is usually one of the plates that make up the capacitor, and the other plate is the outer shell of the switch. This shell is used to During the measurement process, it is usually grounded or connected to the casing of the equipment. 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< br/>3、 Hall proximity switch
Hall element is a type of magnetic sensing element. A switch made using Hall elements is called a Hall switch. When a magnetic object moves closer to the Hall switch, the Hall element on the switch detection surface generates the Hall effect, causing a change in the internal circuit state of the switch, thereby identifying the presence of a magnetic object nearby and controlling the on or off of the switch. The detection object of this proximity switch is a magnetic object< br/>4、 A photoelectric proximity switch is a switch made using the photoelectric effect. Install the light-emitting device and the optoelectronic device in the same detection head in a certain direction. When a reflective surface (the object being detected) approaches, the photoelectric device receives the reflected light and outputs a signal, thereby enabling it to; lquo; Perception: When an object approaches.
5. Pyroelectric proximity switch
A switch made of a component that can sense temperature changes is called a pyroelectric proximity switch. This type of switch installs a pyroelectric device on the detection surface of the switch, and when an object with a different temperature from the environment approaches, the output of the pyroelectric device changes, thereby detecting the approach of an object.
6. Type of proximity switch
When the observer or system changes the distance to the wave source, the frequency of the approaching wave will shift, which is called the Doppler effect. Sonar and radar are made using the principle of this effect. The Doppler effect can be used to make proximity switches.
Microwave proximity switch, etc. When an object approaches, the reflected signal received by the proximity switch will produce a Doppler frequency shift, which can identify whether an object is approaching. The DW-A-603-M30 proximity switch has a wide range of applications in aviation, aerospace technology, and industry. In daily life, automatic doors and hot air fans are used in hotels, restaurants, and other places. In terms of theft prevention, important places such as archives, accounting, finance, museums, and vaults are usually equipped with anti-theft devices composed of various proximity switches. In measurement techniques, such as measuring length and position; In control technology, a large number of proximity switches are also used for measuring and controlling displacement, velocity, and acceleration.