Gems FS-400 Flow Switch

Gems® type FS-400 switches are general purpose, 90° flow path switches. They provide accurate flow detection in water and oil with 1% repeatability. Flow settings on the adjustable version can be easily changed without disassembly. A shuttle bypass vane inside the housing is controlled externally using an ordinary flat-blade screwdriver. These switches are ruggedly constructed of non-corrosive materials and resist shock and vibration. Suitable for triggering alarms on interlocking shutdown circuitry when flow rate is improper to protect bearings, gears, and cooling systems.

Data Sheet

Additional information



Item Type

Hazardous Location, Industrial, OEM

Media Type

Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids

Connection Size

1/8 – 3/4



Body Material


Switch Type


Setpoint Type

Adjustable, Fixed