The McDonnell & Miller FS-254 is a reliable liquid flow switch designed to monitor flow or no-flow conditions in pipelines, making it an essential component in hot water heating systems, pump systems, liquid chillers, and water-cooled equipment. This switch features a durable brass body with EPDM O-ring seals, ensuring longevity and compatibility with various media. It includes four stainless steel paddles to accommodate pipe sizes ranging from 1 to 8 inches, and the paddles can be trimmed for precise fit. The FS-254 operates with a single-pole double-throw (SPDT) snap switch, rated for 7.4A at 120 VAC and 3.7A at 240 VAC. Its adjustable sensitivity allows users to set the desired flow rate for optimal operation. With a NEMA 4 enclosure, the FS-254 is designed for both indoor and outdoor applications, offering maximum fluid temperatures of 250°F (121°C) and a pressure capacity of 160 psi.
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| Manufacturer | McDonnell & Miller |
| Model | FS-254 |
| Part Number | 120610 |
| Application | Monitoring flow or no-flow conditions in pipelines |
| Body Material | Brass |
| Seal Material | EPDM O-rings |
| Connection Size | 1″ NPT |
| Pipe Size Range | 1″ to 8″ |
| Maximum Fluid Temperature | 250°F (121°C) |
| Maximum Pressure | 160 psi (11.2 kg/cm²) |
| Electrical Switch Type | SPDT (Single Pole, Double Throw) |
| Electrical Ratings | 7.4A at 120 VAC; 3.7A at 240 VAC |
| Enclosure Rating | NEMA 4 |
| Included Paddles | 1″, 2″, 3″, and 6″ stainless steel paddles |
| Sensitivity Adjustment | Adjustable flow set points |