What is the use of supervisory switch?
What is the use of supervisory switch?
Valve supervisory switches are used to monitor the open or closed position of the valves that control the water supply in the fire sprinkler system. Supervisory pressure switches monitor the status of the system air pressure in dry and pre-action systems.
What is an OS&Y switch?
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. 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.
What is an OS&Y valve?
QUICK. April 2012. One type of valve commonly used to control water flow to fire sprinkler systems is known as an OS&Y gate valve. OS&Y means “outside stem and yoke” or “outside screw and yoke”. OS&Y gate valves operate by opening and closing via a gate, which lowers into or rises out of the valve.
What is a potter switch?
The Potter PS40 Series Supervisory Pressure Actuated Switches are designed primarily to detect an increase and/or decrease from normal system pressure in automatic fire sprinkler systems. The switch marked with the word LOW is set to operate at a pressure decrease of 10 PSI (,7 BAR) at 30 PSI (2,1 BAR).
What is the difference between pressure switch and flow switch?
Pressure Switches are activated when you reach a certain pressure: between 500-700 PSI. When the pressure meets this threshold, the switch is used to activate the burner for hot water. Flow Switches are activated by the recognition of water flow. The pressure is usually lighter, lower than 500 PSI.
What is the function of tamper switch?
A tamper switch is a mechanical and electrical device connected to a fire protection valve that signals a warning if the valve partially or fully closes. Regardless of the type of tamper switch, they all function similarly. The tamper switch features an actuating unit, usually a lever or cable with a resting position.
What is a PIV tamper switch?
The Model 1181 PIV is a weather proof and tamper resistant wireless switch for monitoring the open position of fire sprinkler control valves of the post indicator, butterfly and other types. The contact operates the external contacts of the wireless transmitter when the valve position is altered from an open state.
Are tamper switches normally open or closed?
NO is Normally Closed or NO is Normally Open Once the switch made by the third party is installed inside the waterflow, tamper, or pressure switch assembly, the lever or piston may normally push the button and quit pushing when there’s an alarm or supervisory.
How can an individual determine when an OS&Y valve is fully opened?
An OS&Y valve is open when the threaded stem extends from the valve. The valve is closed when the stem is not visible above the control wheel.
