4.1.1. When the detection body is metal material, the high-frequency oscillation type proximity switch should be selected. This type of proximity switch is sensitive to the detection of iron nickel and A3 steel detection body. For aluminum, brass and stainless steel detection body, its detection sensitivity is low.
4.1.2. When the test body is non-metallic material, such as; Capacitive proximity switches should be used for wood, paper, plastic, glass and water.
4.1.3. Photoelectric proximity switch or ultrasonic proximity switch should be used for remote detection and control of metallic and non-metallic bodies.
4.1.4. Inexpensive magnetic proximity switch or Hall proximity switch can be used if the detection body is metal and the detection sensitivity is not high.
4.2. Proximity switch technical index detection
4.2.1. Measurement of movement distance; When the action film is approached from the front to the induction surface of the proximity switch, the proximity switch action distance is the large action distance of the proximity switch, and the measured data should be within the parameter range of the product.
4.2.2. Determination of release distance; When the action film leaves the induction surface of the proximity switch from the front and the switch changes from action to release, the distance between the action film and the induction surface is determined.
4.2.3. Measurement of return error H; The opposite value of the difference between the large action distance and the release distance.
4.2.4. Action frequency measurement; The speed regulating motor drives bakelite disk, fixed a number of steel sheets on the disk, adjust the distance between the switch induction surface and the action, about 80% of the switch action distance, rotate the disk, the action film close to the switch in turn, equipped with a speed measuring device on the disc spindle, the switch output signal by shaping, connected to the digital frequency meter. At this time, start the motor and gradually increase the speed. Under the condition that the product of speed and action film is equal to the frequency count, the action frequency of the switch can be read directly from the frequency meter.
