• Pipe Line Size: 1 1/4" and up
• Primary Construction Material: Brass
• Setting Type: Fixed
• Minimum In-Line Restriction; Paddle Pivots to Move Out of Liquid Path with Increasing Flow 

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 is 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 (.21 bar) of pressure drop regardless of pipe size.

Using Gems™ Safe-Pak® Relays and Barriers, these switches provide automatic flow / no flow interlock and are intrinsically-safe without explosion-proof housing and piping.

Applications:

• Compressors
• Heat Exchangers
• Turbines
• Engine
• Boilers
• Chillers
• Valves
• Pumps
• Regulators