• 0 to 500V AC 15 Amp S.P.D.T switch
  • Low Voltage Gold contact model available
  • 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 in both hot and cold liquid. The FM series flow switch can be supplied with a glass fibre reinforced Polypropylene paddle or a stainless steel paddle.

The paddle can be cut and shaped as required to suit pipework 25mm (1 Inch) or larger. 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. Using
the manual override allows pumps to be manually started at any time by simply pressing the button. It also makes the testing and commissioning of systems very simple.

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 aluminium. The result is a high-pressure flow switch with no seals diaphragms or bellows or other points of potential failure. The FM flow switch is supplied as standard with a one piece 316 stainless steel process connection and a fully machined billet aluminium housing. The switch is suitable for use in bore water, sea water
and in many chemical solutions.

There is also a dedicated Diesel and high temperature compatible version available with a stainless steel paddle.