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![Gems FS-550 Series [29609] Flow Switch Paddle Type, Brass, 1" NPT Male](image/cache/wp/gj/Products/Gems_FS-550-Series-long-800x800.webp "Gems FS-550 Series [29609] Flow Switch Paddle Type, Brass, 1\" NPT Male")
The Gems FS-550 series are high pressure, metal paddle flow switches that sense liquid flow in either direction to monitor flow/no-flow conditions. Featuring rugged brass or stainless steel bodies, the FS-550 utilizes a simple and reliable design suitable for operating temperatures from -30 to 300°F and line pressures up to 2000 psig. The FS-550 is available with a standard SPDT switch or an optional 3-pin J-box electrical connection.
The FS-550 series is for use in pipes from 1-1/4 to 4". The unit has two paddle lengths dependent upon pipe size. The short paddle, for 1/1/4" pipes has actuation (or de-actuation) rates from 5 to 29 gpm. The long paddle, for pipes from 1-1/2 to 4" has actuation (or de-actuation) rates from 15 to 52 gpm. Paddles are 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.
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![Gems FS-550 Series [30641] Flow Switch Paddle Type, Brass, 1" NPT Male](image/cache/wp/gj/Products/Gems_FS-550-Series-200x200.webp "Gems FS-550 Series [30641] Flow Switch Paddle Type, Brass, 1\" NPT Male")
