Starting at $150.00
  • Usually ships in 2-3 weeks



  • Accurate Flow Rate Indication with Integral Visual Confirmation
  • 4.5 to 24 VDC Pulsed Output
  • Maximum Operating Pressure
    • Brass or Stainless Steel Body: 200 @ 70°F
    • Polypropylene Body: 100 PSIG @ 70°F
  • Operating Temperature
    • Brass or Stainless Steel Body: -20 to 212°
    • Polypropylene Body: -20 to 180°F
  • Maximum Viscosity: 200 SSU
  • Input Power: 4.5 VDC to 24 VDC
  • Output Signal: 4.5 VDC to 24 VDC Pulse (Sourcing); Pulse Rate Dependent on Flow Rate, Port Size and Range
  • Current Consumption: 8 mA, No Load
  • Maximum Current Source Output: 70 mA
  • Frequency Output Range: 15 Hz (Low Flow) to 225 Hz (High Flow)


The Gems RFO series is a paddlewheel designed flow meter that combines high visibility rotors with solid-state electronics. Packaged into compact, panel mounting housings, the RFO series provides accurate flow rate output with integral visual confirmation and an unprecedented price/performance ratio.

The RFO series has port sizes from 1/4" to 1" NPTF for liquid flow rates from 0.10 to 60 GPM. Featuring rugged brass, stainless steel or polypropylene construction, the RFO utilizes a simple and reliable design suitable for operating temperatures to 212°F and line pressures to 200 psig. The meter features 4.5 to 24 VDC pulse output. The pulse rate is dependent upon flow rate, port size, and range.

Applications for the Gems RFO Series flow switch:

  • Water Purification/Dispensing Systems
  • Chemical Metering Equipment
  • Lasers and Welders
  • Water Injection Systems
  • Semiconductor Processing Equipment
  • Chillers and Heat Exchangers


This product can be used in the following applications: