Gems FS550 & Fine-Tek SF1800

Big FS550   

Gems FS550 series switches are available  with SS or Brass bodies and with NPT or BSP threads. These come with 1/2NPT electrical connection and 600mm flying leads. 

  • Pipe sizes 30mm & up
  • 130 bar & 150°C
  • UL Listed and FM approved
  • SPDT 20VA switch
  • 1 inch NPT mount

Fine-Tek SF1800 Series

  • SF18 with Alloy terminal Head
  • SF70 with SS EXd Head
  • Paddle sizes for pipes from 25mm upwards
  • 150C and 130 bar rating
  • SS Paddle and body SPDT 40W contacts
  • Wetted parts Teflon, SUS304 SS
  • Flow / No Flow at very low trip point


The Gems FS550 & Fine-Tek SF1800 switches sense flow in either direction to monitor flow/no-flow conditions. Paddles are trimmed to suit the pipe size & installation causes a pressure drop of below 30KPa.

Designed to mount vertically - in a horizontal pipe- to prevent false tripping - for low solids content and low viscosity fluids only


Gems FS70 and FS80 Data Sheet