Starting at $279.00
  • Usually ships in 2-3 weeks



  • Flow Rate Settings: 0.1 GPM to 1.0 GPM
  • Port Size: 1/4" NPT
  • Primary Construction Material: Brass
  • Maximum Pressure Rating: 1000 PSIG (Operating), 2500 PSIG (Proof), 5000 PSIG (Burst)
  • Operating Temperature: -20 to 300°F
  • Repeatability: 1% Maximum Deviation
  • Set Point Accuracy: ±10%
  • Set Point Differential: 15% Maximum
  • Switch: SPDT, 20 VA
  • Explosion-Proof Approvals: U.L. Approved for Class I, Division 2, Groups A, B,C, D. Also available with FM approved, explosion proof junction box for Class I, Division 1, Group D hazardous locations. U.L. Approved — File No. E183854


The Gems FS-930 series flow switches have a unique, patented piston design assures accuracy within 20% over a full range of viscosities—from 40 to 1000 SSU—making them ideal for use in applications where liquids of different viscosities are blended; or for use in lubrication systems where oil flow monitoring is critical at start-ups. The switch compensates for viscosity changes automatically. Each unit is factory preset, using 300 SSU oil, for actuation at specified flow rates.

The FS-930 series has a 1/4" NPT port for liquid flow settings from 0.10 to 1.00 GPM. Featuring rugged stainless steel bodies, the FS-930 utilizes a simple and reliable design suitable for operating temperatures from -20 to 300°F and line pressures up to 1000 psig. The Gems FS-930 uses a SPDT switch.

Applications for the Gems FS-930 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 Processing, Beverage Dispensing, Chemical Additives, Gas Sampling, Distilling


This product can be used in the following applications: