RotorFlow RFO & RFA

November 01, 2019




GEMS Sensors popularized the RotorFlow’s paddlewheel design by combining high visibility rotors with solid-state electronics that are packaged into compact, panel mounting housings. They provide accurate flow rate output with integral visual confirmation…all with an unprecedented price/performance ratio. Typical applications include Water Purification/Dispensing Systems, Chemical Metering Equipment, Lasers and Welders, Water Injection Systems, Semiconductor Processing Equipment, Chillers and Heat Exchangers.

Out of stock



  • Body: Brass, Stainless Steel or Polypropylene(Hydrolytically Stable, Glass Reinforced)
  • Rotor Pin: Ceramic
  • Rotor: PPS Composite, Black
  • Lens: Polysulfone
  • O-Ring: Viton® (Brass Body); Buna N (Polypropylene Body)
  • Low Flow Adaptor: Glass Reinforced Polypropylene
  • Port Size: 1/4½ NPT to 1½ NPT
  • Operating Pressure: Brass or Stainless Steel Body 200 PSIG, Maximum: Polypropylene Body 100 PSIG at 70°F, 40 PSI Max. @ 180°F
  • Operating Temperature: Brass or Stainless Steel Body -20°F to 212°F (-29°C to 100°C); Polypropylene Body -20°F to 180°F (-29°C to 82°C)
  • Electronics: 150°F (65°C) Ambient
  • Viscosity: Maximum 200 SSU
  • Input Power: RFO Type 4.5 VDC to 24 VDC; RFA Type 24 VDC, ±10%
  • Output Signal: RFO Type 4.5 VDC to 24 VDC Pulse -pulse rate dependenton flow rate, port size and range: RFA Type 0-10 VDC Analog Signal @ 1mA, Max.
  • Current Consumption: RFO Type 8 mA, No Load; RFA Type 25 mA, Max.
  • Current Source Output: Max. 70 mA
  • FrequencyOutputRange: 25 Hz (Low Flow) to 225 Hz (High Flow)
  • Electrical Termination: 20 AWG PVC-Jacketed, 24Cable.


RotorFlow RFO & RFA