Dwyer Series V8 Flotect® Vane Operated Flow Switch

Dwyer Series V8 Flotect® Vane Operated 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 V8 Flotect® Vane Operated Flow Switches are ideal for protecting unattended equipment from damage or loss of production. This Series is available for installation in a 1 to 6" pipe with operating pressures are up to 150 psig (10 bar) and temperatures to 212°F (100°C).


  • UL recognized as an industrial motor controller per UL standard 508, suitable for mounting in a protected environment
  • Magnetically actuated switching design gives superior performance with free-swinging vane which attracts a magnet within the switch body, actuating a snap switch with no bellows, springs, or seals to fail
  • Leak proof body and vane constructed of tough durable polyphenylene sulfide which has excellent chemical resistance
  • A full size trimmable vane is provided with molded-in graduations


  • Chemical processing
  • Air conditioning
  • Refrigeration
  • Heating systems
  • Cooling lines
  • Machinery
  • Liquid transfer systems
  • Water treatment
  • Food processing
  • Machine tools


ServiceCompatible gases or liquids.
Wetted MaterialsVane and Body: Polyphenylene Sulfide (PPS); Pin and spring: 316 SS or Inconel®; Magnet: Ceramic 8.
Temperature Limit212°F (100°C).
Pressure Limit150 psig (10 bar).
Enclosure RatingGeneral purpose; WP/WP2 option is weatherproof.
Switch TypeSPDT snap switch; MV option: SPDT gold contact snap switch.
Electrical Rating5 A @ 125/250 VAC, 5 A resistive, 3 A inductive @ 30 VDC. MV option: 1 A @ 125 VAC, 1 A resistive, 0.5 A inductive @ 30 VDC.
Electrical Connections18 AWG 18" (460 mm) long.
Conduit Connection1/2" male NPT, 1/2" female NPT on WP and WP2.
Process Connection1" male NPT.
Mounting OrientationActuation/deactuation flow rates are based on horizontal pipe run and are nominal values. Unit cannot be used with vertical down flow.
Set Point AdjustmentVane is trimmable.
Weight4.5 oz (0.13 kg).
Agency ApprovalsCE, cURus.

Download Data Sheet: Series V8 Flotect® Vane Operated Flow Switch

Ref: dwyer-inst.com