Selection and testing of HCH-M14-3T-HL wire resistant winding type proximity switch 1. Selection: For different materials of detection bodies and detection distances, different types of proximity switches should be selected to have better performance in the system. Therefore, the following principles should be followed in selection: 1.1. When the detection body is made of metal materials, frequency oscillation type proximity switches should be selected, which are sensitive to detection of iron nickel and A3 steel. The sensitivity of aluminum, brass, and stainless steel detection bodies is high. 1.2. When the detection body is made of non-metallic materials, such as; Capacitive proximity switches should be used for materials such as wood, paper, plastic, glass, and water. 1.3. When metal and non-metal materials need to be detected and controlled remotely, photoelectric proximity switches or Chaoshengbo proximity switches should be selected. 1.4. When the detection body is metal, if the detection sensitivity is required from time to time, Jiege's magnetic proximity switch or Hall type proximity switch can be selected. 2. Detection 2.1. Action distance measurement; When the action piece approaches the sensing surface of the proximity switch from the front, the distance of the proximity switch action should be the maximum action distance of the proximity switch, and the measured data should be within the product's parameter range. 2.2. Determination of release distance; When the action piece moves away from the sensing surface of the proximity switch from the front, and the switch switches from action to release, measure the distance the action piece moves away from the sensing surface. 2.3. Determination of return error H; The jue pair value of the difference between the large action distance and the release distance. 2.4. Measurement of action frequency; Use a speed regulating motor to drive a rubber disc, fix several steel plates on the disc, adjust the distance between the switch sensing surface and the action plate to about 80% of the switch action distance, rotate the disc, and sequentially make the action plate close to the switch. A speed measuring device is installed on the disc spindle, and the switch output signal is connected to the digital frequency meter through Zhengxing. At this point, start the motor and gradually increase the speed. Under the condition that the product of the speed and the action piece is equal to the frequency count, the action frequency of the switch can be directly read out by the frequency meter. 2.5. Determination of repeatability; Fix the action piece on the quantity, and control the movement speed at 0.1mm/s from the front of the switch sensing surface near the action area of the switch, beyond 120% of the switch action distance. When the switch is activated, read the reading on the quantity and then exit the action area to disconnect the switch. Repeat this process 10 times, and then calculate the difference between the large and small values of the 10 measurements and the average value of the 10 measurements. The larger difference is the repeatability error. The HCH-M14-3T-HL wire resistant winding proximity switch is used in daily life, such as automatic doors in hotels, restaurants, and garages, and automatic hot air fans. In terms of anti theft, important places such as data archives, finance and accounting, museums, and vaults are usually equipped with anti-theft devices composed of various proximity switches. In measurement techniques, such as length and position measurement; In control technology, such as displacement, velocity, and acceleration measurement and control, a large number of proximity switches are also used.