Mcdonnell & Miller Series FS4-3T General Purpose Liquid Flow Switches

The McDonnell & Miller FS4-3T is a flow switch used to detect liquid flow in piping systems. Its in-line configuration eliminates the need for a pipe tee, making it suitable for industrial applications such as pump protection, boiler control, and process monitoring where flow verification is required.

The FS4-3T is available in 3/4 NPT and 1 NPT sizes. It includes paddles for low, medium, or high flow detection and has two electrical connections. Note that this model is listed as obsolete/discontinued by the manufacturer, so availability is limited to existing stock.

You can source the McDonnell & Miller FS4-3T through 3G Electric in Singapore. We provide industrial equipment sourcing, handle logistics and customs clearance, and arrange delivery to your facility. Contact us for current availability and lead time on this discontinued model.

Install the FS4-3T in a horizontal pipe section with the flow arrow aligned to flow direction. Select the appropriate paddle for your flow range. Ensure electrical connections match the switch rating. Follow standard piping practices and consult the manufacturer's manual for torque and wiring details.