Description
McDonnell & Miller 120611 FS-251 – 1" NPT General Purpose Flow Switch with NEMA 1 Enclosure
Reliable Liquid Flow Detection for Industrial and Commercial Systems
The McDonnell & Miller FS-251 is a versatile 1" NPT liquid flow switch designed to control electrically operated equipment like signal lights, alarms, motors, and automatic burners. Its universal design fits a wide range of applications requiring dependable flow sensing in commercial and industrial settings.
Equipped with four stainless steel paddles (1", 2", 3", and 6") and an adjustable sensitivity screw, the FS-251 offers easy customization to fit different pipe sizes and flow rates. The EPDM O-ring seal ensures a durable, leak-resistant connection. This model features a NEMA 1 enclosure and serves as a direct replacement for flow switches from Johnson/Penn, Potter/Taco, Watts, Hydrolevel, and more.
Key Benefits:
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NEMA 1 enclosure suitable for indoor dry locations
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Adjustable sensitivity for precise flow detection
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Four paddle sizes included for various pipe diameters
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Single pole, double throw (SPDT) snap switch for reliable switching
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EPDM O-ring seal for lasting durability
Applications:
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Industrial and commercial liquid flow monitoring
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Control of equipment based on flow presence
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Replacement for popular flow switch brands
Specifications
| Attribute | Details |
|---|---|
| Part Number | 120611 FS-251 |
| Product Type | General Purpose Liquid Flow Switch |
| Connection Size | 1" NPT Threaded |
| Switch Type | Single Pole Double Throw (SPDT) |
| Amperage | 3.7A (120V), 7.4A (240V) |
| Voltage | 120V / 240V |
| Frequency | 50 / 60 Hz |
| Max Pressure | 160 PSI (11.2 kg/cm²) |
| Temperature Range | 32°F to 250°F (0°C to 121°C) |
| Material | Stainless Steel Paddles, EPDM O-ring Seal |
| Paddle Sizes Included | 1", 2", 3", 6" (25, 50, 80, 150 mm) |
| Enclosure Rating | NEMA 1 (Indoor Use) |
