The difference between limit switch and proximity sensor:
- 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.
- Limit switches are used for position detection in one direction. For two-way position detection, using a proximity sensor is better.
- Use limit switch for protection function. Use a proximity sensor to detect when an object passes a certain point.
- 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.