Dwyer Instruments FS-2 Flow Switch
The Dwyer Instruments FS-2 Flow Switch is a rugged, vane-actuated solution designed for reliable flow proving in hydronic and industrial liquid systems. This paddle flow switch features a 1" male NPT process connection and a durable forged brass body, making it ideal for monitoring flow in boilers, chillers, and horizontal pipelines ranging from 1" to 8" in diameter. With a NEMA 4 enclosure (IP64) made of die-cast aluminum, this unit is built for weatherproof outdoor or indoor installations. The high-capacity SPDT snap switch is rated for 10A resistive and 3A inductive loads at 250 VAC, providing versatile control for "flow or no flow" applications. Designed to handle demanding environments, it maintains a 145 psig pressure limit and a 230 degree temperature limit. The field-adjustable vane layers and setpoint adjustment screw allow technicians to fine-tune actuation points to specific HVAC flow switch requirements without needing proprietary tools on-site.
Key Benefits- Adjustable Vane System: Multi-layer stainless steel paddles can be trimmed to fit pipe sizes from 1" up to 8", ensuring broad system compatibility.
- Weatherproof Reliability: The NEMA 4 enclosure protects internal components from moisture and dust, suitable for heavy-duty mechanical rooms and outdoor cooling towers.
- Wide Application Range: Optimized for boiler flow proving, liquid transfer systems, and hot water heaters with a high thermal ceiling of 230°F.
- Field-Serviceable Setpoints: Includes an external adjustment screw for precise flow sensor calibration after installation.
- Durable Wetted Parts: Features a tin-bronze bellow and stainless steel vane for long-term resistance in compatible liquid media.
What is the proper mounting orientation for the FS-2?
To ensure accurate actuation and prevent vane sticking, the switch must be installed vertically on a horizontal pipe run. Always maintain a straight pipe run of at least five diameters upstream and downstream from turbulence sources like elbows or pumps.
How do I adjust the flow setpoint?
Sensitivity is managed by a combination of removing vane layers to match your pipe ID and turning the internal setpoint adjustment screw. Rotating the screw increases or decreases the spring tension required for the vane flow switch to trip the SPDT contact.
Can this switch be used for oils or solvents?
Yes, the Dwyer FS-2 is compatible with various liquids, provided they do not chemically react with the tin-bronze bellows, stainless steel vane, or forged brass body. Always verify media compatibility against the wetted materials list before installation.
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.
Original: $103.59
-65%$103.59
$36.26Dwyer Instruments FS-2 Flow Switch
The Dwyer Instruments FS-2 Flow Switch is a rugged, vane-actuated solution designed for reliable flow proving in hydronic and industrial liquid systems. This paddle flow switch features a 1" male NPT process connection and a durable forged brass body, making it ideal for monitoring flow in boilers, chillers, and horizontal pipelines ranging from 1" to 8" in diameter. With a NEMA 4 enclosure (IP64) made of die-cast aluminum, this unit is built for weatherproof outdoor or indoor installations. The high-capacity SPDT snap switch is rated for 10A resistive and 3A inductive loads at 250 VAC, providing versatile control for "flow or no flow" applications. Designed to handle demanding environments, it maintains a 145 psig pressure limit and a 230 degree temperature limit. The field-adjustable vane layers and setpoint adjustment screw allow technicians to fine-tune actuation points to specific HVAC flow switch requirements without needing proprietary tools on-site.
Key Benefits- Adjustable Vane System: Multi-layer stainless steel paddles can be trimmed to fit pipe sizes from 1" up to 8", ensuring broad system compatibility.
- Weatherproof Reliability: The NEMA 4 enclosure protects internal components from moisture and dust, suitable for heavy-duty mechanical rooms and outdoor cooling towers.
- Wide Application Range: Optimized for boiler flow proving, liquid transfer systems, and hot water heaters with a high thermal ceiling of 230°F.
- Field-Serviceable Setpoints: Includes an external adjustment screw for precise flow sensor calibration after installation.
- Durable Wetted Parts: Features a tin-bronze bellow and stainless steel vane for long-term resistance in compatible liquid media.
What is the proper mounting orientation for the FS-2?
To ensure accurate actuation and prevent vane sticking, the switch must be installed vertically on a horizontal pipe run. Always maintain a straight pipe run of at least five diameters upstream and downstream from turbulence sources like elbows or pumps.
How do I adjust the flow setpoint?
Sensitivity is managed by a combination of removing vane layers to match your pipe ID and turning the internal setpoint adjustment screw. Rotating the screw increases or decreases the spring tension required for the vane flow switch to trip the SPDT contact.
Can this switch be used for oils or solvents?
Yes, the Dwyer FS-2 is compatible with various liquids, provided they do not chemically react with the tin-bronze bellows, stainless steel vane, or forged brass body. Always verify media compatibility against the wetted materials list before installation.
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.
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Description
The Dwyer Instruments FS-2 Flow Switch is a rugged, vane-actuated solution designed for reliable flow proving in hydronic and industrial liquid systems. This paddle flow switch features a 1" male NPT process connection and a durable forged brass body, making it ideal for monitoring flow in boilers, chillers, and horizontal pipelines ranging from 1" to 8" in diameter. With a NEMA 4 enclosure (IP64) made of die-cast aluminum, this unit is built for weatherproof outdoor or indoor installations. The high-capacity SPDT snap switch is rated for 10A resistive and 3A inductive loads at 250 VAC, providing versatile control for "flow or no flow" applications. Designed to handle demanding environments, it maintains a 145 psig pressure limit and a 230 degree temperature limit. The field-adjustable vane layers and setpoint adjustment screw allow technicians to fine-tune actuation points to specific HVAC flow switch requirements without needing proprietary tools on-site.
Key Benefits- Adjustable Vane System: Multi-layer stainless steel paddles can be trimmed to fit pipe sizes from 1" up to 8", ensuring broad system compatibility.
- Weatherproof Reliability: The NEMA 4 enclosure protects internal components from moisture and dust, suitable for heavy-duty mechanical rooms and outdoor cooling towers.
- Wide Application Range: Optimized for boiler flow proving, liquid transfer systems, and hot water heaters with a high thermal ceiling of 230°F.
- Field-Serviceable Setpoints: Includes an external adjustment screw for precise flow sensor calibration after installation.
- Durable Wetted Parts: Features a tin-bronze bellow and stainless steel vane for long-term resistance in compatible liquid media.
What is the proper mounting orientation for the FS-2?
To ensure accurate actuation and prevent vane sticking, the switch must be installed vertically on a horizontal pipe run. Always maintain a straight pipe run of at least five diameters upstream and downstream from turbulence sources like elbows or pumps.
How do I adjust the flow setpoint?
Sensitivity is managed by a combination of removing vane layers to match your pipe ID and turning the internal setpoint adjustment screw. Rotating the screw increases or decreases the spring tension required for the vane flow switch to trip the SPDT contact.
Can this switch be used for oils or solvents?
Yes, the Dwyer FS-2 is compatible with various liquids, provided they do not chemically react with the tin-bronze bellows, stainless steel vane, or forged brass body. Always verify media compatibility against the wetted materials list before installation.
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.
