P+F photoelectric proximity switch is called a photoelectric switch made of the photoelectric effect. The light-emitting device and the photoelectric device are installed in the same detection head in a certain direction. When a reflective surface (the object to be detected) is approaching, the photoelectric device receives the reflected light and outputs the signal, so that it can "sense" the proximity of the object.
The diode of the P+F photoswitch is a light-emitting diode, the output is a phototransistor, C is the collector, and E is the emitter.
Generally, when the triode is used as a switch, the collector is generally used as the output terminal.
General connection: the diode is the input terminal, E is grounded, C is connected to the load, and the other end of the load needs to be connected to the positive power supply. This method of connection has a wide range of applications.
Special connection: the diode is the input terminal, C is connected to the power supply, E is connected to the load, and the other end of the load needs to be grounded. This connection method is only suitable for when the load equivalent resistance is very small (within tens of ohms), if the load equivalent resistance is relatively large, it may cause the switch triode operation point to be abnormal, resulting in unreliable switch operation.
Main Applications:
P+F proximity switches are widely used in aviation, aerospace technology as well as in industrial production. In daily life, such as the active door of hotels, restaurants, garages, and active hot air blowers are used. In terms of security and anti-theft, such as data archives, accounting, finance, museums, vaults and other important places, they are generally equipped with anti-theft equipment composed of various proximity switches. In the measurement skills, such as the measurement of length and position; In the manipulation skills, such as the measurement and control of displacement, velocity, and acceleration, a large number of proximity switches are also used.
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