McDonnell & Miller FS7-4 Flow Switch 1-1/4 Inch NPT Large Pipe Application

The McDonnell & Miller FS7-4 is a paddle-type flow switch designed for large pipe applications requiring reliable flow monitoring in hydronic heating, cooling, and process control systems. This rugged flow switch features a 1-1/4 inch NPT connection for installation in larger diameter piping systems where accurate flow detection is critical.

Key Features:

• 1-1/4 inch NPT threaded connection for large pipe applications
• Paddle-type flow sensing mechanism for reliable detection in various flow conditions
• SPDT snap-action switch provides positive contact operation
• Adjustable flow rate setpoint to accommodate different system requirements
• Durable brass body construction for long service life
• Suitable for water, glycol solutions, and compatible fluids
• UL listed for safety and reliability

The FS7-4 flow switch is ideal for protecting pumps, boilers, and chillers by detecting loss of flow conditions and triggering alarms or shutting down equipment. The adjustable paddle design allows for customization based on pipe size and minimum flow requirements, making it a versatile solution for HVAC and industrial applications.