Gems Sensor & Control FS-550 Series Flow Switch

Last Updated: 27/02/2019

Gems Sensor & Control 61189

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Part Number: 61189 Categories: ,

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Model FS-550
Primary Material of Construction Alloy
Sensor Type Paddle Type
Adjustable Range N/A
Flow Setting (GPM) 5.0 – 29.0
Body Material 316 Stainless Steel
Port Size 1″ NPT Male
Switch Type SPDT (20VA)
Set Point Accuracy ±25%
Maximum Pressure (PSI) Over 500
Minimum Temperature (°F) -30
Maximum Temperature 300
Electrical Termination 3-Pin Junction Box
Set Point Differential N/A
Wetted Materials 316 Stainless Steel, Teflon®, Ceramic
Approvals UL Recognized, CSA, CE, FM
Recommended Filtration N/A


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.