Leyon FM UL OSYSU1 2 OUTSIDE SCREW AND YOKE VALVE SUPERVISORY SWITCH

The OSYSU is used to monitor the open position of an OS&Y (outside screw and yoke) type gate valve. This device is available in two models; the OSYSU-1, containing one set of SPDT (Form C) contacts and the OSYSU-2, containing two sets of SPDT (Form C) contacts. These switches mount conveniently to most OS&Y valves ranging in size from 2″ to 12″ (50mm to 300mm). They will mount on some valves as small as ½”(12,5mm).The cover is held in place by two tamper resistant screws that require a special tool to remove. The tool is furnished with each device and should be left with the building owner or responsible party.