Dwyer Series FS-2 Paddle Vane Flow Switch

Dwyer Series FS-2 Paddle Vane Flow Switch

Flow includes Flow Transmitters, Flow Sensors, Flowmeters, Sight Flow Indicators and Water Meters. Mass Flowmeters, Controllers, Flow Indicators and Controllers are ideal for measurement of flow rates. Flow Switches come as paddle, thermal, piezo, and shuttle/piston. Flow Switch Sensors with an electrical contact output at a specific flow rate have different types of switches, which are paddle, thermal, piezo, and shuttle/piston.

Paddle flow switches or vane sensors with an electrical contact output are at a specific flow rate. Dwyer flow switches are economical and reliable. Applications include proof of boiler flow, air conditioning, controlling of dampers according to flow, and protecting pumps, motors and other equipment against low or no flow. The Series FS-2 Vane Flow Switches offers an economical flow proving solution. The FS-2 paddles are adjustable to fit 1 to 8" size pipe.


  • Field adjustable set point adjustment screw allows for easy flow switch modification
  • Custom application set points enabled by field adjustable vane layers
  • Aluminum weatherproof housing permits outdoor installation


  • Boiler flow proving
  • Hot water heaters
  • Chillers
  • Cooling lines
  • Machinery
  • Liquid transfer systems


ServiceCompatible liquids.
Wetted MaterialsBellow: Tin-bronze; Vane: SS; Body: Forged brass.
Temperature Limits230°F (110°C).
Pressure Limits145 psig (10 bar).
Enclosure RatingNEMA 4 (IP64).
Switch TypeSPDT snap switch.
Electrical Rating10 A res, 3 A ind @ 250 VAC.
Electrical ConnectionCable gland with attached wire leads or optional conduit connection.
Process Connection1" male NPT or BSPT.
Mounting OrientationSwitch must be installed vertically on horizontal pipe runs.
Set Point AdjustmentFour vane combinations and an adjustment screw.
EnclosureDie-cast aluminum alloy.
Weight28.22 oz (0.8 kg).
Agency ApprovalsCE.

Download Data Sheet: Series FS-2 Paddle Vane Flow Switch

Ref: dwyer-inst.com