FS-550 High Presure Paddle Flow Switch

November 01, 2019





Designed for installation in pipe lines from 1-1/4” and up, Gems standard FS-550 switches sense liquid flow in either direction to monitor flow/no-flow conditions. They are supplied in two paddle lengths, the paddle being trimmed during installation to permit switch actuation at the desired flow rate. As flow increases in a pipe, the paddle of the switch pivots to move out of the liquid path, producing less than 3 PSIG of pressure drop regardless of pipe size.

Out of stock



  • Housing: Brass or 316 Stainless Steel
  • Paddle: 302 Stainless Steel
  • Spring: 316 Stainless Steel
  • Other Wetted Parts: Ceramic and Teflon®
  • Maximum Operating Pressure: 2000 PSIG
  • Pressure Drop: 3 PSIG Maximum
  • Operating Temperature: -30°F to + 300°F (-34.4°C to + 148.9°C)
  • Set Point Accuracy: ± 25%
  • Switch: SPDT, 20 VA
  • Repeatability: ± 5%
  • Electrical Termination: No. 18 AWG, 24” L., Polymeric Lead Wires