FM Series Paddle Flow Switch


  • Australian Made
  • 0 to 500V AC 15 Amp S.P.D.T switch
  • 316 Stainless Process Connection
  • Super Tough Billet Aluminium Housing
  • Manual override built in
  • 3/4” & 1” models available with BSP or NPT threads
  • 400 Bar (5800 psi) pressure rating
  • Seal-less magnetic drive
  • Dieselene & High Temperature versions available
  • Weatherproof IP67 housing
  • Easily serviceable


The FM Series flow switch is built tough for the most arduous industrial and mining applications.

It is a rugged but highly sensitive paddle flow switch suitable for a wide range of flow sensing applications. The FM Series flow switch can be supplied with a glass fibre reinforced Polypropylene paddle, or a Nickel Copper alloy paddle suitable for use with diesel and high temperature applications.

A unique feature of the FM flow switch is its built in manual override. The manual override allows the flow switch to be switched on at any time at the press of a button regardless of lack of flow.

A magnetic coupling system is built into each FM flow switch and couples the paddles movement to the high compliance switch through a solid wall of stainless steel and aluminum. The result is a high-pressure flow switch with no seals diaphragms or bellows or other points of potential failure. The switch is suitable for use in bore water, sea water and in many chemical solutions.

See the data sheet linked below for more information on the available models in the FM Series and the ordering codes.

More Information

Paddle Trimming Calculator

The paddles for our FM Series switches are supplied at a set length. The paddle can be cut down to suit your pipework and flow rate. We recommend using our Paddle Trimming Calculator (linked above) to find the correct paddle length for your application.


For assistance in choosing the correct product for your needs, check out our Product Selection Guide. 

3D Model & Download