The Xylem-McDonnell & Miller FS4-3S is a general purpose liquid flow switch engineered for reliable flow detection in a wide range of hydronic, plumbing, and industrial fluid systems. Built with a durable stainless steel body, this switch is designed to withstand demanding environments and resist corrosion, making it a long-lasting solution for both commercial and light industrial applications.
Key Features
- 1″ NPT pipe connection for straightforward installation into standard piping systems
- SPDT (Single Pole Double Throw) switch configuration for versatile circuit control — use normally open or normally closed contacts as required
- Stainless steel body construction for superior corrosion resistance and durability
- Rated for up to 160 PSI maximum operating pressure
- Includes four interchangeable stainless steel paddles: 1″, 2″, 3″, and 6″ sizes to accommodate a wide variety of pipe diameters and flow rates
- General purpose design suitable for water, glycol solutions, and other compatible liquids
- Part Number: 114641
Paddle Versatility
The FS4-3S ships complete with four stainless steel paddles (1″, 2″, 3″, and 6″) so technicians can select the correct paddle for the specific pipe size and flow velocity of the application. This eliminates the need for separate paddle purchases and makes the switch adaptable across multiple system configurations.
Typical Applications
- Hydronic heating and cooling systems
- Boiler low-water cutoff and flow proving
- Chilled water systems
- Pump protection and flow verification
- Industrial process fluid monitoring
Specifications
- SKU: FS4-3S
- Part Number: 114641
- Brand: Xylem-McDonnell & Miller
- Connection Size: 1″ NPT
- Switch Type: SPDT (Single Pole Double Throw)
- Body Material: Stainless Steel
- Maximum Pressure: 160 PSI
- Included Paddles: 1″, 2″, 3″, and 6″ Stainless Steel
