Description
Overview
The Xylem-McDonnell & Miller FS7-4S is a heavy-duty industrial liquid flow switch engineered for demanding HVAC and process piping applications. Built with a full stainless steel body and trimmable stainless steel paddles, this switch delivers reliable flow detection with the corrosion resistance and pressure capability required in commercial and industrial environments.
Key Features
- 1-1/4″ NPT connection for straightforward in-line installation
- SPDT (Single-Pole, Double-Throw) snap-action switch for precise, reliable switching
- Stainless steel body construction for superior corrosion resistance
- Trimmable stainless steel paddles allow field adjustment to match a wide range of pipe sizes and flow conditions
- Rated for up to 1,000 PSI maximum working pressure — suitable for high-pressure industrial systems
- Part Number: 120160
Applications
- Hydronic heating and cooling systems
- Chilled water and condenser water circuits
- Industrial process piping requiring flow verification
- Pump protection and low-flow alarm circuits
- Any liquid system demanding high-pressure-rated flow sensing
Why Choose the FS7-4S
The FS7-4S combines industrial-grade materials with a field-adjustable paddle design, making it one of the most versatile liquid flow switches in the McDonnell & Miller lineup. The SPDT snap switch action ensures clean, bounce-free electrical switching, while the all-stainless construction stands up to aggressive fluids and harsh installation environments. With a 1,000 PSI pressure rating, this switch is equally at home in standard HVAC hydronic systems and high-pressure industrial process applications.
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