McDonnell & Miller Model FS1-W High Sensitivity Liquid Flow Switches

The McDonnell & Miller FS1-W flow switch is used to detect liquid flow or no-flow conditions in industrial piping systems. Its in-line configuration eliminates the need for a pipe tee, making it suitable for HVAC, boiler, and process control applications where reliable flow detection is required.

The FS1-W features a 1/2 inch NPT connection, high flow capacity, and a single-pole double-throw snap switch. The switch compartment is completely isolated from the process fluid. It is designed for in-line mounting without a pipe tee, simplifying installation in industrial systems.

You can source the McDonnell & Miller FS1-W flow switch through 3G Electric in Singapore. We provide procurement, logistics, customs clearance, and delivery services to your facility. Contact us for pricing and lead time on this item.

Install the FS1-W directly in-line with the pipe using its 1/2 inch NPT connection—no pipe tee is needed. Ensure the flow direction matches the arrow on the body. Wire the single-pole double-throw switch according to your control circuit. Always follow local electrical codes and the manufacturer's manual.