Description
McDonnell & Miller FS7-4W Industrial Liquid Flow Switch
The McDonnell & Miller FS7-4W is a heavy-duty industrial liquid flow switch engineered for reliable flow detection in demanding hydronic and process piping systems. Featuring a 1-1/4″ NPT connection and a Single-Pole Double-Throw (SPDT) snap-action switch mechanism, this unit delivers precise, dependable switching performance across a wide range of liquid flow applications.
Key Features
- 1-1/4″ NPT pipe connection for straightforward installation into standard piping systems
- SPDT snap-action switch provides both normally open and normally closed circuit options
- Rated for up to 300 PSI maximum working pressure — suitable for high-pressure industrial and commercial systems
- Trimmable stainless steel paddles allow field adjustment to accommodate varying pipe sizes and flow rates
- NEMA 4X enclosure rating offers protection against corrosion, dust, and water ingress — ideal for wet or washdown environments
- Part Number: 120201
- SKU: FS7-4W
Applications
- Boiler and hydronic heating systems
- Chilled water and cooling systems
- Industrial process piping and liquid handling
- Pump protection and flow proving circuits
- Commercial HVAC water distribution systems
Why Choose the FS7-4W?
The FS7-4W combines rugged industrial construction with versatile field-adjustability. The trimmable stainless steel paddles make it easy to set the correct actuation point for your specific pipe diameter and flow velocity, while the NEMA 4X enclosure ensures long service life even in harsh or corrosive environments. The SPDT snap switch configuration gives installers maximum wiring flexibility for both safety interlock and control circuit applications.
Reviews
There are no reviews yet.