McDonnell & Miller FS7-4 Industrial Liquid Flow Switch

FS7-4 Industrial Liquid Flow Switch from McDonnell & Miller is a paddle-type universal flow switch designed to reliably monitor liquid flow. This 1-1/4 inch nominal size device features a threaded end connection and a SPDT snap switch for versatile control across commercial and industrial systems.

Operating from 32 to 300°F and rated up to 300 PSI, this rugged unit handles tough environments while maintaining precise sensitivity via an adjustable screw. Electrical specs include a current rating of 7.4 A at 120 V AC and 3.7 A at 240 V AC, with a 125 V-amp input rating at 120/240 V AC and 50/60 Hz. UL and CSA approvals further confirm its reliability in demanding installations.

• Paddle-type universal flow switch for accurate liquid detection across a wide range of fluids
• 1-1/4" nominal size with threaded end connections for easy installation
• SPDT snap switch output with robust electrical ratings — 7.4 A @ 120 VAC; 3.7 A @ 240 VAC
• Flow/no-flow ranges – Flow: 4.8–7.7 GPM; No-flow: 3–5.9 GPM
• Wide operating conditions – 32–300°F and up to 300 PSI
• Sensitivity adjustable screw for on-site tuning and UL/CSA approval