McDonnell & Miller FS4-3S Switch
The McDonnell & Miller FS4-3S (Part Number 114641) is a rugged general purpose liquid flow switch specifically engineered for high-demand hydronic and industrial applications. This 1" NPT flow switch features a high-grade stainless steel body and hardened stainless steel bearings to minimize friction and prevent mechanical failure in the field. Designed as the direct replacement for FS4-3S-E, it integrates a Single Pole Double Throw (SPDT) snap switch for precise control of boilers, chillers, and signal circuits. With a maximum pressure of 160 PSI and a maximum liquid temperature rating of 250°F (121°C), this unit provides dependable flow detection for pipes ranging from 1" to 6" using the included stainless steel paddles. The sealed Monel bellows offer superior corrosion resistance compared to standard brass components, ensuring long-term performance in diverse water chemistories.
Technician-Grade Benefits:- Universal Compatibility: Serves as a versatile replacement for Johnson/Penn, Potter/Taco, Watts, and Hydro-level switches.
- Field-Adjustable Sensitivity: Features an external adjusting screw to calibrate the flow rate trip point without system teardown.
- Flexible Wiring: Dual electrical knockouts allow for convenient conduit connection from either side of the housing.
- Complete Paddle Kit: Ships with 1", 2", 3", and 6" reinforced stainless steel paddles to accommodate various line sizes.
- Maximum Durability: The Monel bellows and stainless steel trim provide a robust barrier against aggressive fluids.
Can the FS4-3S be used on vertical piping?
Yes, this switch can be installed in horizontal or vertical lines with upward flow. It is not recommended for downward flow applications as it may not provide accurate trip points.
How do I adjust the sensitivity for low-flow applications?
The sensitivity adjusting screw located under the cover allows you to fine-tune the switch's response. Turning the screw clockwise increases the flow rate required to actuate the switch.
Is the McDonnell & Miller 114641 suitable for outdoor use?
The standard FS4-3S is designed for indoor applications (NEMA 1). For outdoor or wash-down environments, a NEMA 4X rated enclosure version is required.
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.
Original: $682.10
-65%$682.10
$238.73McDonnell & Miller FS4-3S Switch
The McDonnell & Miller FS4-3S (Part Number 114641) is a rugged general purpose liquid flow switch specifically engineered for high-demand hydronic and industrial applications. This 1" NPT flow switch features a high-grade stainless steel body and hardened stainless steel bearings to minimize friction and prevent mechanical failure in the field. Designed as the direct replacement for FS4-3S-E, it integrates a Single Pole Double Throw (SPDT) snap switch for precise control of boilers, chillers, and signal circuits. With a maximum pressure of 160 PSI and a maximum liquid temperature rating of 250°F (121°C), this unit provides dependable flow detection for pipes ranging from 1" to 6" using the included stainless steel paddles. The sealed Monel bellows offer superior corrosion resistance compared to standard brass components, ensuring long-term performance in diverse water chemistories.
Technician-Grade Benefits:- Universal Compatibility: Serves as a versatile replacement for Johnson/Penn, Potter/Taco, Watts, and Hydro-level switches.
- Field-Adjustable Sensitivity: Features an external adjusting screw to calibrate the flow rate trip point without system teardown.
- Flexible Wiring: Dual electrical knockouts allow for convenient conduit connection from either side of the housing.
- Complete Paddle Kit: Ships with 1", 2", 3", and 6" reinforced stainless steel paddles to accommodate various line sizes.
- Maximum Durability: The Monel bellows and stainless steel trim provide a robust barrier against aggressive fluids.
Can the FS4-3S be used on vertical piping?
Yes, this switch can be installed in horizontal or vertical lines with upward flow. It is not recommended for downward flow applications as it may not provide accurate trip points.
How do I adjust the sensitivity for low-flow applications?
The sensitivity adjusting screw located under the cover allows you to fine-tune the switch's response. Turning the screw clockwise increases the flow rate required to actuate the switch.
Is the McDonnell & Miller 114641 suitable for outdoor use?
The standard FS4-3S is designed for indoor applications (NEMA 1). For outdoor or wash-down environments, a NEMA 4X rated enclosure version is required.
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.
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Description
The McDonnell & Miller FS4-3S (Part Number 114641) is a rugged general purpose liquid flow switch specifically engineered for high-demand hydronic and industrial applications. This 1" NPT flow switch features a high-grade stainless steel body and hardened stainless steel bearings to minimize friction and prevent mechanical failure in the field. Designed as the direct replacement for FS4-3S-E, it integrates a Single Pole Double Throw (SPDT) snap switch for precise control of boilers, chillers, and signal circuits. With a maximum pressure of 160 PSI and a maximum liquid temperature rating of 250°F (121°C), this unit provides dependable flow detection for pipes ranging from 1" to 6" using the included stainless steel paddles. The sealed Monel bellows offer superior corrosion resistance compared to standard brass components, ensuring long-term performance in diverse water chemistories.
Technician-Grade Benefits:- Universal Compatibility: Serves as a versatile replacement for Johnson/Penn, Potter/Taco, Watts, and Hydro-level switches.
- Field-Adjustable Sensitivity: Features an external adjusting screw to calibrate the flow rate trip point without system teardown.
- Flexible Wiring: Dual electrical knockouts allow for convenient conduit connection from either side of the housing.
- Complete Paddle Kit: Ships with 1", 2", 3", and 6" reinforced stainless steel paddles to accommodate various line sizes.
- Maximum Durability: The Monel bellows and stainless steel trim provide a robust barrier against aggressive fluids.
Can the FS4-3S be used on vertical piping?
Yes, this switch can be installed in horizontal or vertical lines with upward flow. It is not recommended for downward flow applications as it may not provide accurate trip points.
How do I adjust the sensitivity for low-flow applications?
The sensitivity adjusting screw located under the cover allows you to fine-tune the switch's response. Turning the screw clockwise increases the flow rate required to actuate the switch.
Is the McDonnell & Miller 114641 suitable for outdoor use?
The standard FS4-3S is designed for indoor applications (NEMA 1). For outdoor or wash-down environments, a NEMA 4X rated enclosure version is required.
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.
