Working of Float level switch

The most known and simple level switch consists of a float which is mounted on a moveable arm and magnetically coupled to a micro switch (outside the process). Also versions exist with a spherical float, which contains a small magnet and move upwards a tube. In the tube one or more reed relays are placed. The reed relays will switch as the (magnetic) float passes by. The image below shows a simple float type mechanism.

Advantages of Float level switch

  • Relatively simple.
  • It is suitable for various products
  • Low cost.

Disadvantages of Float level switch

  • Requires a certain mounting
  • No reproduction switch point
  • There is a malfunction in case of build-up.
  • It is not fail-safe.