Gems FS-500 Flow Switch

Gems® type FS-500 switches are low cost units for threaded plastic piping. They offer 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.

Data Sheet

Additional information



Item Type

Industrial, OEM

Media Type

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

Connection Size

1/8 – 3/4



Body Material


Switch Type


Setpoint Type