Xylem FS7-4SW Industrial Liquid Flow Switch 1-1/4 NPT Stainless Steel NEMA 4X

The Xylem McDonnell & Miller FS7-4SW is an industrial-grade liquid flow switch designed for heavy-duty HVAC, boiler, and industrial process applications requiring water-tight and dust-tight protection. This high-pressure flow switch features a rugged stainless steel body construction capable of handling up to 1000 PSI operating pressure, making it ideal for demanding industrial environments.

Key Features:

• 1-1/4 inch NPT male threaded connection for in-line tee installation
• Stainless steel body and trimmable paddles for corrosion resistance and custom sizing
• NEMA 4X rated enclosure provides water-tight and dust-tight protection
• Single pole, double throw (SPDT) snap switch with magnetic switching mechanism
• Maximum operating pressure of 1000 PSI
• Temperature range from -65°F to 300°F
• Sensitivity adjustment screw for easy flow rate calibration
• 120/240 VAC dual voltage capability, 7.4/3.7 amp rating
• Suitable for pipe sizes 2 inches to 6 inches (standard paddle included)

The FS7-4SW features a paddle-type flow sensing mechanism that actuates when liquid flow reaches the set threshold. The adjustable sensitivity and trimmable paddles allow for precise calibration to match specific application requirements. Manufacturer part number 120191.