Starting at $270.00
  • Usually ships in 2-3 weeks



  • Combines Visual Confirmation of Flow with Dynamic, Electronic Switch Operation
  • Easy, Adjustable Switch Point Calibration
  • Local LED Signals When Setpoint is Reached
  • Body Materials: Brass, 316 Stainless Steel or Polypropylene
  • Maximum Operating Pressure
    • Brass or Stainless Steel Body: 200 PSIG @ 70°F
    • Polypropylene Body: 100 PSIG @ 70°F
  • Operating Temperature
    • Brass or Stainless Steel Body: -20 to 212°F
    • Polypropylene Body: -20 to 180°F
  • Maximum Viscosity: 200 SSU
  • Input Power: 24 VDC or 115 VAC
  • Relay Contact Ratings (SPDT): 1 Amp, 24 VDC Resistive; 0.3 Amp, 110 VAC
  • Current Consumption
    • 24 VDC: 20mA (No Load); 35mA (Load)
    • 115 VAC: 45mA (No Load); 95mA (Load)
  • Repeatability: 2% Maximum Deviation
  • Set Point Accuracy (Factory Set): ± 5%
  • Set Point Differential: 15% Maximum


The Gems RFS series flow switch builds an extra level of reliability and protection into your equipment. Combining visual confirmation of flow with dynamic, electronic switch operation, the RFS series cannot be deceived into indicating a positive flow situation when no flow actually exists. Once set to a desired actuation point, the RFS will switch to a "no-flow" condition should the rotor stop for any reason. The RFS series has easy, adjustable switch point calibration making it the ideal instrument to protect expensive electronic equipment from coolant flow failure.

The RFS series has port sizes from 1/4" to 1" NPTF for liquid flow settings from 0.10 to 60 GPM. Featuring rugged brass, stainless steel or polypropylene construction, the RFS utilizes a simple and reliable design suitable for operating temperatures to 212°F and line pressures to 200 psig.

Applications for the Gems RFS Series flow switch:

  • Semiconductor Processing Equipment
  • Lasers
  • Medical Equipment
  • X-Ray and Other High Power Tubes
  • Robotic Welding Equipment


This product can be used in the following applications: