Potter OSYSU-2 Outside Screw and Yoke Valve Supervisory Switch

The Potter OSYSU-2 Outside Screw and Yoke Valve Supervisory Switch tracks the physical position of control valves to prevent the accidental or unauthorized shutoff of critical fire sprinkler water supplies. Running on a dual-contact mechanism with two independent sets of Form C SPDT contacts rated at 15 Amps, this mechanical device detects when a valve handle is turned toward the closed position, signaling a supervisory trouble condition to the fire alarm control panel within one full revolution. Built inside a NEMA 4 and NEMA 6P waterproof die-cast metal housing with a distinct red powder-coat finish, the switch mounts directly to valve yokes ranging from 2 inches to 12 inches (and select models down to 0.5 inches) utilizing an adjustable stainless steel trip rod that fits into a field-filed groove on the valve stem. The unit features built-in dual 0.5-inch conduit knockouts, a factory-installed neoprene gasket, and a security cover secured by specialized tamper-resistant fasteners, providing robust life-safety code compliance and environmental resilience backed by a 5-year warranty.