The FS 22 miniaturized copper-bodied flow switch, which measures 6 in (152.4 mm) in length, was designed for direct connection to existing 1/2-in pipes. The switch reportedly provides “no-flow” protection for pumps and similar sensitive equipment in central heating and boiler systems. The vertical mount flow switch operates with a small head of liquid and features a pressure drop of 17 mBar at 1 L/m (0.25 psi). The switch has a maximum switch rating of 300 V d.c., 1 A, 10 W, with an operating temperature range of -30°C to +85°C.
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