Gems Sensor & Control FS-550 Series Flow Switch

Last Updated: 27/02/2019

Gems Sensor & Control 30641

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Part Number: 30641 Categories: ,

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Primary Material of ConstructionAlloy
Sensor TypePaddle Type
Adjustable RangeN/A
Flow Setting (GPM)5.0 – 29.0
Body MaterialBrass
Port Size1″ NPT Male
Switch TypeSPDT (20VA)
Set Point Accuracy±25%
Maximum Pressure (PSI)Over 500
Minimum Temperature (°F)-30
Maximum Temperature300
Electrical Termination18 AWG, 24″-26″ Polymeric Leads
Set Point DifferentialN/A
Wetted MaterialsBrass, 316 Stainless Steel, Teflon®, Ceramic
ApprovalsUL Recognized, CSA, CE, FM
Recommended FiltrationN/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.