What basic types of water flow switches are used in fire protection systems?

What basic types of water flow switches are used in fire protection systems?

• A. Pressure-type
• B. Vane-type
• C. Both pressure-type and vane-type
• D. None of the above

Answer: (C)

Two basic kinds of water flow switches used in fire protection systems are pressure-type and vane-type. A pressure-type flow switch senses the change in water pressure that occurs when water begins to flow; when flow is detected, a pressure sensor triggers the switch to signal alarms or release controls. A vane-type flow switch, often called a paddle switch, uses a small paddle that is moved by the flowing water; once the paddle deflects past a set point, the switch activates. Both types are used to detect sprinkler flow and initiate alarms or system responses, so saying that both are the basic types accurately reflects how these devices are applied in fire protection systems.

Two basic kinds of water flow switches used in fire protection systems are pressure-type and vane-type. A pressure-type flow switch senses the change in water pressure that occurs when water begins to flow; when flow is detected, a pressure sensor triggers the switch to signal alarms or release controls. A vane-type flow switch, often called a paddle switch, uses a small paddle that is moved by the flowing water; once the paddle deflects past a set point, the switch activates. Both types are used to detect sprinkler flow and initiate alarms or system responses, so saying that both are the basic types accurately reflects how these devices are applied in fire protection systems.