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    Tag: limit switch

    Difference between Limit Switch and Proximity Sensor

    The difference between limit switch and proximity sensor:

    1. Proximity sensors are non-contact switches with a long life and are suitable for passing objects. Limit switches are contact switches. Due to the internal contacts, the working life is relatively shorter.
    2. Limit switches are used for position detection in one direction. For two-way position detection, using a proximity sensor is better.
    3. Use limit switch for protection function. Use a proximity sensor to detect when an object passes a certain point.
    4. The limit switch usually has 1 NO + 1 NC contacts. Generally only one group of contacts is used, so there are 2 wires. Proximity sensors generally adopt 2-wire, 3-wire and 4-wire, so they have more wires than limit switches. Some proximity sensors have to confirm it is PNP or NPN based on the connected equipment.
    How to Select a Limit Switch?

    Limit switch is a device that makes use of the collision of the machine moving parts to make the contacts operating to realize the control circuit is turned on or off, so as to achieve a certain control purpose. It cooperates with other devices to form more complex automation equipments in industry. Therefore, selecting more suitable limit switches will make the entire automatic control system becomes more reasonable and efficient.