The proximity sensor is a generic term for sensors that are intended to detect objects that do not require contact with the object to be detected, instead of contact detection methods such as limit switches. The movement information and presence information of the detectable object are converted into electrical signals. The detection method for changing to an electric signal includes a method of using an eddy current generated in a metal body of a detection target due to electromagnetic induction, a method of changing a capacity of an electric signal due to the proximity of a capturing body, a method of using a stone and a guide switch. . In the JIS standard, JIS standard (JIS C 8201-5-2 low-voltage switchgear and control device, fifth control circuit device and switching element, and 2nd) was developed based on the non-contact position detection switch of IEC 60947-5-2. Section proximity switch). In the definition of JIS, a product that can detect the proximity of an object and detect the presence of a nearby object in a non-contact manner in the sensor is collectively referred to as a “proximity switchâ€, and is a sensor type, an electrostatic capacity type, an ultrasonic type, a photoelectric type, and a magnetic force. Type and other components. In this technical guide, a proximity sensor that detects the presence of a metal, a capacitance proximity sensor that detects the presence of metal and a non-metal object, and a switch that uses a DC magnetic field generated by a magnetic force are defined as "proximity sensors." 1 Since it can be detected in a non-contact manner, it does not abrade or damage the test object. 2 Since the contactless output method is adopted, the life extension (except magnetic type) adopts semiconductor output, which has no effect on the life of the contact. 3 Unlike light detection methods, it is suitable for use in environments where water, oil, etc. are used, and is almost unaffected by the stains, oil, water, etc. of the test object. In addition, it also includes Teflon shell type and drug-resistant products 4 High speed response compared to contact switches 5 can correspond to a wide range of temperatures 6 It is not affected by the color of the object to be inspected to detect the change of the physical property of the object to be inspected, so it is hardly influenced by the surface color, etc. 7 Unlike the contact type, the sensors affect each other due to the influence of ambient temperature, surrounding objects, and sensors of the same type, including sensors and capacitance types. Therefore, for the sensor settings, mutual interference needs to be considered. In addition, in the induction type, it is necessary to consider the influence of the surrounding metal, and in the electrostatic capacitance type, the influence of the surrounding object needs to be considered. Inductive proximity sensor detection principle By the influence of an external magnetic field, the magnetic loss caused by the eddy current generated on the surface of the conductor is detected. An alternating magnetic field is generated in the detection coil, and the detection of the impedance change caused by the eddy current generated in the body of the detection body is detected. In addition, as another method, an aluminum detection sensor that detects a frequency phase component and an all-metal sensor that detects only an impedance change component through a working coil are also included. The state of the transformer occurs on the surface of the sample body and the sensor side. Reference editing area Oil Seals,Spare Parts Bearing Shaft,Split Oil Seal,Pressure Cooker Sealing Ring Dongguan Guo Hao Seals Technology Co;Ltd , https://www.ghrubberseals.com
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