Xylem FS254 General Purpose Liquid Flow Switch with NEMA 4 Enclosure

The Xylem FS254 (McDonnell & Miller) is a rugged general purpose liquid flow switch designed for monitoring flow rates in industrial and commercial HVAC applications. This versatile device is engineered for starting and stopping electrical equipment such as alarms, motors, and automatic burners based on liquid flow conditions.

Key Features:

• NEMA 4 weatherproof enclosure for indoor and outdoor installations
• 1 inch NPT threaded connection for horizontal mounting
• SPDT (Single Pole Double Throw) snap action switch for reliable switching
• Includes four stainless steel paddles: 1 inch, 2 inch, 3 inch, and 6 inch lengths for various pipe sizes and flow conditions
• Sensitivity adjustment screw allows precise flow rate calibration
• Brass and aluminum base construction ensures durability
• Maximum operating temperature of 250°F
• 160 PSI maximum operating pressure
• Universal design with two electrical knockouts for flexible wiring from either end

The FS254 is ideal for monitoring water flow in heating systems, cooling systems, and other liquid transfer applications where reliable flow detection is critical for system performance and safety. Part number 120610.