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Omron proximity sensors: selection criteria

Omron proximity sensors: selection criteria

Omron developed the first transistor contact at the beginning of ‘60s. Since then the company has specialized in the development of proximity sensors, so much to become today one of the leaders in the production of these sensors.

The result of the investment in this technology can be seen in the different types of these sensors sold on the market.

Inductive proximity sensors can detect, within their reading distance, a metallic – ferrous – object, thanks to the magnetic field they generate. On the other hand the capacitive proximity sensors are able to detect objects of different nature (glass, plastic, liquids), thanks to their ability to generate an electrostatic field and to measure the change in capacity when an object passes through.

How much does the shielding affect the choice of sensor to be used? Shielded proximity sensors have longer sensing distances than the others. For this reason for flush mounting of the metal, it is better to choose a shielded sensor. When you need to use unshielded sensors, remember to respect the minimum distances indicated in the catalog.

Selection criteria:

  • Detection distance
  • Shielding
  • Degree of protection
  • Output – interfacing
  • Dimensions
  • Connection
  • Switching frequency
  • Power Supply

The protection degree of some sensors could be IP67 or IP69K. Compared to the IP67, which concerns the protection of sensors from water and dust penetration, the IP69K guarantees protection against the entry of water at high temperature and high pressure. The test piece is sprayed with water at 80°C at 80 to 100 bars with a nozzle of the specified shape. The water volume is 14 to 16 l/min.

Some proximity sensors are also compatible with IO-Link. This system provides two-way communication allowing the sensors to exchange status information and operating parameters with the automation system.

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