Paddle flow meter


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 and an unprecedented price/performance ratio.

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Paddle flow meter

 Gems RotoFlow® RFO Series offers a low cost solution to flow rate monitoring where moderate accuracy is required. Accuracies of ± 7% are achieved on most models without calibration & improved accuracy with on-site calibration. Output frequencies of 25 to 225 Hz are produced & matching instrumentation can be supplied The RotoFlow is available in PP, Brass and SS versions in sizes up to 25mm – Output is Hall Effect

  • Water & chemical dispensing systems
  • 0.5 to 100 L/min.
  • Polypropylene, Brass or SS bodies
  • Square wave output 4.5V to 24V DC
  • Max viscosity 200 SSU
  • Special OEM versions to order
  • Water Purification/Dispensing Systems
  • Chemical Metering Equipment
  • Lasers and Welders
  • Water Injection Systems
  • Semiconductor Processing Equipment
  • Chillers and Heat exchangers

 Downloads:   Data sheet   

Additional information


Polypropylene, Stainless Steel

Flow range

0.5-5.0 GPM, 4-20 GPM

Output options

No output (visual Indicator only), pulse output