McDonnell & Miller FS7-4WJ Switch
The McDonnell & Miller FS7-4WJ Flow Switch (Part Number 120261) is an industrial-grade liquid flow switch engineered for high-pressure applications where environmental protection is paramount. This unit features a 1-1/4" BSPT connection and is housed in a rugged NEMA 4X enclosure, providing superior resistance against corrosion, moisture, and debris in mechanical rooms or processing plants. Rated for a maximum pressure of 300 PSI (21 kg/cm²), the FS7-4WJ utilizes a Single Pole, Double Throw (SPDT) snap switch for reliable pump control or alarm signaling. The internal components are built for extreme thermal ranges, operating effectively from -65°F to 300°F (-54°C to 149°C). For versatile field installation, the switch includes trimmable stainless steel paddles, allowing technicians to calibrate response based on specific pipe diameters and flow velocities.
Technical Benefits for Contractors:
- Industrial Durability: The NEMA 4X rating ensures the electrical head remains sealed in wash-down environments or high-humidity cooling tower applications.
- High-Pressure Capability: Rated for 300 PSI, making it suitable for high-rise hydronic loops and industrial process piping.
- Customizable Flow Sensitivity: Includes an adjustable sensitivity screw and diverse paddle lengths to prevent nuisance tripping in varying flow conditions.
- Reliable Switching: The SPDT snap switch provides clean making and breaking of circuits, essential for pump protection and flow interlock safety.
- Corrosion Resistance: Features a durable brass body and stainless steel paddles to maintain integrity in treated water or liquid systems.
Common Technical Questions:
Can the FS7-4WJ be used in outdoor installations?
Yes, the NEMA 4X watertight enclosure is specifically designed to protect the internal switch mechanism from rain, ice, and hose-directed water.
How do you calibrate the paddle for different pipe sizes?
The unit comes with trimmable stainless steel paddles. Technicians should follow the included template to cut the paddle to the appropriate length for the specific pipe I.D. to ensure proper leverage and switch actuation.
What is the difference between the FS7-4 and the FS7-4WJ?
The "WJ" designation indicates the NEMA 4X housing and a 1-1/4" BSPT thread, whereas standard models may feature different threading or standard NEMA 1 enclosures.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
McDonnell & Miller FS7-4WJ Switch
The McDonnell & Miller FS7-4WJ Flow Switch (Part Number 120261) is an industrial-grade liquid flow switch engineered for high-pressure applications where environmental protection is paramount. This unit features a 1-1/4" BSPT connection and is housed in a rugged NEMA 4X enclosure, providing superior resistance against corrosion, moisture, and debris in mechanical rooms or processing plants. Rated for a maximum pressure of 300 PSI (21 kg/cm²), the FS7-4WJ utilizes a Single Pole, Double Throw (SPDT) snap switch for reliable pump control or alarm signaling. The internal components are built for extreme thermal ranges, operating effectively from -65°F to 300°F (-54°C to 149°C). For versatile field installation, the switch includes trimmable stainless steel paddles, allowing technicians to calibrate response based on specific pipe diameters and flow velocities.
Technical Benefits for Contractors:
- Industrial Durability: The NEMA 4X rating ensures the electrical head remains sealed in wash-down environments or high-humidity cooling tower applications.
- High-Pressure Capability: Rated for 300 PSI, making it suitable for high-rise hydronic loops and industrial process piping.
- Customizable Flow Sensitivity: Includes an adjustable sensitivity screw and diverse paddle lengths to prevent nuisance tripping in varying flow conditions.
- Reliable Switching: The SPDT snap switch provides clean making and breaking of circuits, essential for pump protection and flow interlock safety.
- Corrosion Resistance: Features a durable brass body and stainless steel paddles to maintain integrity in treated water or liquid systems.
Common Technical Questions:
Can the FS7-4WJ be used in outdoor installations?
Yes, the NEMA 4X watertight enclosure is specifically designed to protect the internal switch mechanism from rain, ice, and hose-directed water.
How do you calibrate the paddle for different pipe sizes?
The unit comes with trimmable stainless steel paddles. Technicians should follow the included template to cut the paddle to the appropriate length for the specific pipe I.D. to ensure proper leverage and switch actuation.
What is the difference between the FS7-4 and the FS7-4WJ?
The "WJ" designation indicates the NEMA 4X housing and a 1-1/4" BSPT thread, whereas standard models may feature different threading or standard NEMA 1 enclosures.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
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Description
The McDonnell & Miller FS7-4WJ Flow Switch (Part Number 120261) is an industrial-grade liquid flow switch engineered for high-pressure applications where environmental protection is paramount. This unit features a 1-1/4" BSPT connection and is housed in a rugged NEMA 4X enclosure, providing superior resistance against corrosion, moisture, and debris in mechanical rooms or processing plants. Rated for a maximum pressure of 300 PSI (21 kg/cm²), the FS7-4WJ utilizes a Single Pole, Double Throw (SPDT) snap switch for reliable pump control or alarm signaling. The internal components are built for extreme thermal ranges, operating effectively from -65°F to 300°F (-54°C to 149°C). For versatile field installation, the switch includes trimmable stainless steel paddles, allowing technicians to calibrate response based on specific pipe diameters and flow velocities.
Technical Benefits for Contractors:
- Industrial Durability: The NEMA 4X rating ensures the electrical head remains sealed in wash-down environments or high-humidity cooling tower applications.
- High-Pressure Capability: Rated for 300 PSI, making it suitable for high-rise hydronic loops and industrial process piping.
- Customizable Flow Sensitivity: Includes an adjustable sensitivity screw and diverse paddle lengths to prevent nuisance tripping in varying flow conditions.
- Reliable Switching: The SPDT snap switch provides clean making and breaking of circuits, essential for pump protection and flow interlock safety.
- Corrosion Resistance: Features a durable brass body and stainless steel paddles to maintain integrity in treated water or liquid systems.
Common Technical Questions:
Can the FS7-4WJ be used in outdoor installations?
Yes, the NEMA 4X watertight enclosure is specifically designed to protect the internal switch mechanism from rain, ice, and hose-directed water.
How do you calibrate the paddle for different pipe sizes?
The unit comes with trimmable stainless steel paddles. Technicians should follow the included template to cut the paddle to the appropriate length for the specific pipe I.D. to ensure proper leverage and switch actuation.
What is the difference between the FS7-4 and the FS7-4WJ?
The "WJ" designation indicates the NEMA 4X housing and a 1-1/4" BSPT thread, whereas standard models may feature different threading or standard NEMA 1 enclosures.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
