Construction and Operation 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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