Gems FS-500 Series Flow Switch

Last Updates: 15/02/2021

Gems Sensors & Controls 175901


Primary Material of ConstructionPlastic
Sensor TypeShuttle Type
Adjustable RangeN/A
Flow Setting (GPM)0.25
Body MaterialPolypropylene
Port Size3/4″ NPT Female
Switch TypeSPDT (5A – 240VAC, 28VDC)
Set Point Accuracy±20%
Maximum Pressure (PSI)0 – 150
Maximum Temperature212
Electrical TerminationJunction Box w/ 6′ PVC Cable
Set Point Differential20%
Wetted MaterialsPolypropylene, Viton, 316 Stainless Steel, PH 15-7 Mo Stainless Steel
Recommended Filtration100 micron


The FS-500 offers low cost flow monitoring with a variety of switch actuation points and low pressure drop. All wetted parts are polypropylene or stainless steel, making this switch ideal for a wide range of chemical and temperature requirements. The materials are also NSF or FDA approved for potable water treatment applications including chlorinators, purifiers and heaters. The FS-500 is ideal for equipment cooling including welders, lasers, etc. A J-box version with a 5 amp relay is also available for direct control of higher electrical loads, such as chlorinator pumps

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