Description
McDonnell & Miller FS7-4SW Industrial Liquid Flow Switch
The McDonnell & Miller FS7-4SW is a heavy-duty industrial liquid flow switch engineered for demanding hydronic and process piping applications. Featuring a robust stainless steel body and a NEMA 4X-rated enclosure, this switch delivers reliable flow detection in harsh environments where corrosion resistance and weatherproof protection are essential.
Key Features
- 1-1/4″ NPT connection for straightforward inline installation
- SPDT (Single-Pole, Double-Throw) snap-action switch for precise, reliable switching
- Stainless steel body construction for superior corrosion resistance
- Rated for up to 1,000 PSI maximum working pressure — ideal for high-pressure industrial systems
- Trimmable stainless steel paddles accommodate a wide range of pipe sizes and flow conditions
- NEMA 4X enclosure provides protection against dust, dirt, splashing water, and corrosive environments
- Part Number: 120191
Application & Benefits
The FS7-4SW is designed for use in industrial liquid flow detection across a variety of systems including hydronic heating and cooling, chilled water, process water, and other liquid piping circuits. The SPDT snap switch provides a clean, positive switching action suitable for controlling pumps, alarms, and safety circuits. The trimmable stainless steel paddles allow field adjustment to match the specific pipe diameter and required flow rate threshold, making this switch highly versatile across multiple installations.
Specifications
- SKU: FS7-4SW
- Part Number: 120191
- Connection Size: 1-1/4″ NPT
- Switch Type: SPDT Snap Switch
- Body Material: Stainless Steel
- Paddle Material: Stainless Steel (Trimmable)
- Maximum Working Pressure: 1,000 PSI
- Enclosure Rating: NEMA 4X
- Brand: McDonnell & Miller (Xylem)
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