The Hydrolevel FS200 Liquid Flow Switch (Part Number 44-200) is a heavy-duty, general-purpose control designed for high-reliability flow detection in hydronic heating and cooling systems. Built to withstand a maximum pressure of 160 PSI and fluid temperatures up to 250?F, this switch is the industry standard for protecting boilers, pumps, and chillers from no-flow conditions. Its universal design allows it to serve as a direct field replacement for common models from McDonnell & Miller, Penn, and Taco. The unit features a robust NEMA 1 general-purpose enclosure with dual knockouts for 1/2" conduit, housing a high-capacity SPDT switch rated for 120/240VAC pilot duty. This Safgard flow switch includes four stainless steel paddles that can be trimmed to fit 1" to 6" pipe diameters, ensuring precise response across various flow rates. Its non-bellows EPDM seal provides superior performance compared to traditional mechanical bellows, reducing the risk of fatigue-related leaks in commercial HVACR applications. Key Benefits Universal Compatibility: Simplifies truck stock by replacing multiple competitor brands with a single 1" NPT connection unit. Field-Adjustable Sensitivity: Features an accessible adjustment screw to fine-tune activation and deactivation points for specific system requirements. Durable Construction: Employs stainless steel paddles and a 13-gauge galvanized steel chassis for reliable operation in demanding mechanical rooms. Leak-Resistant Design: The EPDM rubber seal design eliminates the common failure points associated with traditional metal bellows. Versatile Mounting: Suitable for horizontal pipe runs or vertical installations with upward liquid flow. Common Questions What pipe sizes is the FS200 compatible with? The Hydrolevel 44-200 is designed to work with all pipe diameters from 1" to 6" using the included segmented stainless steel paddles. Can this switch be used in vertical piping? Yes, the FS200 flow switch can be installed in vertical lines, provided the liquid flow direction is strictly upward to ensure proper paddle return. Is the sensitivity adjustable for light flow applications? The unit features adjustable flow sensitivity, allowing technicians to calibrate the switch to detect the specific GPM thresholds required for safety interlocks or pump monitoring. 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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