Construction and 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

  1. Relatively simple.
  2. It is suitable for various products
  3. Low cost.


Disadvantages of Float level switch

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


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