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Gems^® 26602 general purpose flow switch is part of the FS-400 series family.  They have a 90° flow path and 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. The FS-400 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.