Dwyer Instruments V6EPB-B-S-3-B Flow Switch

The Dwyer Instruments V6EPB-B-S-3-B is a heavy-duty, mini-size explosion proof flow switch specifically engineered for monitoring liquid, gas, or air flows in high-stakes industrial and HVACR environments. Built with a brass upper and lower body and a rugged 1" NPT brass tee, this unit is designed to provide liquid flow monitoring or gas flow signals without the risk of mechanical failure common in bellows-style switches. Utilizing a unique magnetically-actuated switch design, the internal SPDT switch (Single Pole Double Throw) triggers via a free-swinging vane that attracts a magnet within the solid metal body. This leak-proof construction, machined from bar stock, eliminates springs and seals to ensure long-term reliability in process control and equipment protection.

For technicians performing retrofits, this model serves as a direct replacement for the FS6-W-1 flow switch. It is critical to verify GPM sensitivity requirements for your specific loop before installation, as flow rates and set points may vary. Rated for explosion-proof service (UL/CSA listed for Class I, Groups A, B, C, D; Class II, Groups E, F, G), the V6EPB-B-S-3-B is ideal for protecting pumps from low-flow conditions or interlocking burners with airflow. The compact flow switch housing allows for installation in tight mechanical spaces where larger models fail to fit, while the 5A electrical rating ensures compatibility with standard control circuits. This industrial flow monitoring tool maintains integrity under pressures up to 250 psi (17.2 bar) and temperatures up to 220°F (105°C).

• Magnetically-actuated logic eliminates the need for failure-prone bellows or physical seals between the process and the electrical housing.
• Leak-proof brass body machined from solid bar stock provides superior durability for high-pressure HVAC flow switch applications.
• Explosion-proof hazardous location rating ensures safe operation in Class I and Class II environments.
• Compact mini-size frame allows for 1" NPT installations in cluttered piping runs where standard switches encounter clearance issues.
• Field-serviceable design allows for the replacement of the electrical assembly without shutting down the entire process line.

Is the V6EPB-B-S-3-B a direct swap for the FS6-W-1?
Yes, it is the designated replacement; however, always check the GPM sensitivity and flow set-points of the original unit to ensure the system triggers correctly under low-flow conditions.

What media can this switch handle?
The brass construction and stainless steel vane are compatible with water, oils, and non-corrosive gases. For highly corrosive agents, a stainless steel variant may be required.

Can I install this in any orientation?
While the switch can function in various positions, the nominal actuation and deactuation rates are calibrated based on horizontal pipe runs. Vertical installation may significantly alter the GPM trip points.

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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.