Controller Detects Flow Interruptions


The model FS bulk material flow control can be used as a flow / no flow device, or it can be used as a downstream plugged chute detector. The rugged cast aluminum enclosure is designed for NEMA 4 weatherproof applications, while the explosion proof version can be used in NEMA 7 vapor explosion proof and NEMA 9 dust ignition proof environments. Optional black epoxy coating is also available for additional corrosion resistance.


The standard 20 amp SP/DT microswitches (or optional 15 amp DP/DT microswitches) can be used to control a variety of equipment such as start-stop operations of conveyors, elevators, feeder systems, and even provide control of audible or visual warning alarms. The paddle is stainless steel material and can be easily replaced if worn or damaged. Paddle and counterweight are easily field adjustable to any angular orientation. The model FS controller is cULus Listed.  


  • The housing is cast aluminum, with optional epoxy or polyester coatings available.
  • These coatings will provide protection against corrosion that is equal or greater than cast iron.
  • The unit can detect the presence or absence of dry bulk material on a conveyor belt.
  • The unit is mounted on the conveyor by drilling (3) 13/32-in. diameter holes.
  • General purpose (weatherproof) units have (1) 3/4-in. NPT conduit opening.
  • The units have dry, unpowered SP/DT micro-switch(es) rated for 20A @ 120, 240, and 480 VAC.
  • The paddle, counterweight, and cross shaft are all field adjustable for a variety of effects.
  • The operating temperature range is -40º to 150ºF
  • The general-purpose units are rated NEMA Type 4/4X weatherproof and corrosion-resistant. Explosionproof units are rated NEMA Type 7/9 for dust ignitionproof and vapor explosion proof. The dual-rated "D" units are rated NEMA Type 4 weatherproof and NEMA Type 9 dust ignitionproof.
  • The  general-purpose controls are IP65 compliant.
  • Most models are cULus Certified
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