• Unique Trailing Wire Flow Sensor 
  • 0 to 500V AC 15 Amp S.P.D.T Switch Standard 
  • Gold Contact Low Voltage Model Available 
  • 1” BSP or NPT models available 
  • Option of 316 Stainless or Polypropylene Connection
  • Easily Serviceable 
  • 400 Bar 5800psi Rated Models Available 
  • Built In Manual Override 
  • Seal-less Magnetic Drive 
  • Adjustable Sensitivity 
  • IP67 Weatherproof


The TW Series flow switches are available with various lengths of the flexible stainless steel wire from 50mm to 300mm (2” to 12”). The required wire length must be specified when ordering.

The flow rate required to actuate the TW flow switch will depend on many variables such as turbulence, liquid viscosity and the exact surface area of sensor wire exposed to the flow.

The TW-H models are the standard models in the TW Series. The TW-L models are the low voltage options specifically designed for use in Ex applications and with low wetting currents.

More Information

Please note that we are currently experiencing extended delays in the manufacture of the 'L'  type microswitch models in the TW Series. Contact us for more details.

Wire Trimming Calculator

As with our Paddle Flow Switches,  the Trailing Wires for our TW Series can be cut down in length to suit your pipework if needed. Please refer to our Paddle Trimming Calculator to find the correct wire length for your application. The width of the wires is 2mm.

Please note that if you do cut down the length of your trailing wire, you must either silver solder or tig weld the end of the wire to prevent fraying.