The System Sensor WFD30N is a heavy-duty vane-type waterflow detector engineered specifically for integration into 3-inch schedule 10 through 40 steel piping systems. Designed for wet-pipe fire protection and hydronic installations, this flow switch utilizes a durable polyethylene vane and a mechanical pneumatic retard mechanism to minimize false alarms caused by pressure surges or trapped air. With a static pressure rating of 450 PSI and a NEMA 4 enclosure, this unit is built for reliable performance in both indoor and outdoor environments. The internal terminal block features two sets of SPDT contacts (Form C) rated at 10 Amps, allowing for simultaneous local alarm activation and fire alarm control panel notification. This vane-type detector triggers when flow rates reach 4 to 10 GPM, ensuring code-compliant monitoring for commercial and industrial applications. Designed for veteran contractors, the WFD30N offers field-replaceable components and a high-contrast timer dial to simplify commissioning and maintenance in the field. Key Benefits for the Job Site Broad Compatibility: Fits 3" nominal pipe sizes across Schedule 10 through 40 steel pipe ranges. Weatherproof Reliability: NEMA 4/IP56 rated housing protects internal synchronized switches from dust and water ingress. Reduced False Alarms: Field-adjustable pneumatic retard prevents nuisance tripping from hydraulic hammers. High Pressure Handing: Rated for systems up to 450 PSI, meeting the demands of high-rise and industrial water systems. Technician-Friendly Design: Features wire-ready terminals and a tamper-resistant cover with a built-in wrench holder. Common Contractor Questions Can the WFD30N be installed on copper piping? No, this model is designed strictly for steel pipe. The mounting hardware and vane geometry are optimized for schedule 10 to 40 steel; using it on copper can cause pipe collapse or flow switch failure. Does this unit support vertical orientations? Yes, the System Sensor WFD30N can be mounted in both horizontal and vertical upflow positions. Avoid vertical downflow installations as air pockets can cause inconsistent vane movement. How do I adjust the time delay? The pneumatic retard is adjusted via the high-contrast dial inside the housing. This allows for a delay of up to 90 seconds to ensure the alarm only triggers on sustained waterflow. 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.
