Starting at $489.00
  • Usually ships in 2-3 weeks



  • Flow Rate Settings:
    • Liquids: Infinite adjustment between 0.5 GPM and 20.0 GPM
    • Air/Gases: 1 to 75 SCFM (for 5 PSIG line); 3 to 160 SCFM (for 100 PSIG line)
  • Port Size: 1/2" NPT
  • Primary Construction Material: Brass or Stainless Steel
  • Setting Type: Adjustable
  • Pressure Rating: Operating 1000 PSIG (69 bar); Proof 2500 PSIG (172 bar); Burst 5000 PSIG (345 bar)
  • Operating Temperature
    • With Brass or S.S. Piston: -20°F to +300°F
    • With Polysulfone Piston: -20°F to +225°F
  • Repeatability: 1% Maximum Deviation
  • Set Point Accuracy: ±10% Maximum
  • Set Point Differential: 15% Maximum
  • Switch: SPDT, 20 VA
  • Electrical Termination: Polymeric leads (18 AWG, 24-26" long); 1/2” NPT conduit connector
  • Viton®O-Ring


The Gems FS-10798 series externally adjustable flow switches are ideal for protecting machine tools from coolant flow failure, for protecting bearings from loss of lubricant or to assure proper air flow. Offering an unlimited number of flow settings at pressures up to 1000 psig, the FS-10798 series has low pressure drop and precise repeatability.

The FS-10798 is available with brass or stainless steel construction. The adjusting vane is easily field adjustable using an ordinary flat-bladed screwdriver. The adjustment is set-screw-locked for tamper-free operation after field calibration. The units include 1/2" NPT ports. Electrical termination can be either 24" polymeric leads (18 AWG) or a 1/2" NPT conduit connector.

Both gas and liquid versions of the FS-10798 are available. Water or oil flow units should not be utilized for air/gas applications. The gas flow configuration utilizes a special dash-pot piston for reliability. Flow ranges will vary with the density of the gas. Please contact us for more information.

Applications for the Gems FS-10798 Series flow switch:

  • Electronic Equipment: Laser Heads, Welders, Power Supplies, High Speed Spindles, X-Ray Tubes, Semiconductor Equipment
  • Bearings or Gears: Presses, Rotating Equipment, Conveyors, Machine Tools, Robotics
  • Processing & Dispensing Equipment: Water Purifications and Filtering, X-Ray Film, Beverage Dispensing, Chemical Additives, Gas Sampling, Distilling


This product can be used in the following applications: