Description
McDonnell & Miller 114641 FS4-3S – 1" NPT Flow Switch with Stainless Steel Body & Monel Bellows
Universal Liquid Flow Switch for General Purpose & Corrosive Applications
The McDonnell & Miller FS4-3S is a versatile 1" NPT flow switch designed to control electrically operated devices like signal lights, alarms, motors, and automatic burners by sensing liquid flow. Featuring a rugged stainless steel body, sealed Monel bellows, and hardened stainless steel bearings, it provides reliable, low-friction operation for a wide range of fluids including corrosive liquids.
Complete with four stainless steel paddles (1", 2", 3", 6"), this switch offers easy sensitivity adjustment and electrical connection flexibility via dual knockouts. It’s a dependable replacement for common flow switches from Johnson/Penn, Potter/Taco, Watts, Hydrolevel, and more.
Key Benefits:
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Durable stainless steel body and Monel bellows for corrosion resistance
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Adjustable sensitivity for precise flow detection
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Four paddle sizes included for varied pipe diameters
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Single pole, double throw (SPDT) snap switch for reliable switching
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Easy wiring with two electrical knockouts
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Optional features include time delay, reinforced paddles, and BSPT threads
Applications:
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General liquid flow control in HVAC, industrial, and fire sprinkler systems
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Replacement for various major manufacturer models
Specifications
| Attribute | Details |
|---|---|
| Part Number | 114641 FS4-3S |
| Product Type | Liquid Flow Switch |
| Connection Size | 1" NPT Threaded |
| Switch Type | Single Pole Double Throw (SPDT) |
| Amperage | 7.4A (240V), 3.7A (120V) |
| Voltage | 120V / 240V |
| Frequency | 50 / 60 Hz |
| Max Pressure | 160 PSI (11.3 kg/cm²) |
| Temperature Range | 32°F to 300°F (0°C to 149°C) |
| Material | Stainless Steel Body, Monel Bellows, Hardened Stainless Bearings |
| Paddle Sizes Included | 1", 2", 3", 6" (25, 50, 80, 150 mm) |
| Optional Features | Time delay, reinforced paddles, BSPT threads |
