System Sensor WFDNF Series EngSpec

and Engineering Specification Sensor WFDNFS and WFDNFT Waterflow Detectors waterflow detector shall be System Sensor model WFDNFS or WFDNFT The waterflow shall be listed to UL 346 The detector shall be a Vane type waterflow detector with a cover and shall be installed on system piping as designated on the drawing and or specified Detectors shall mount on any clear pipe span of the appropriate nominal size a vertical up flow or horizontal run at least 6 from any fittings that may change water flow rate or pipe diameter or no closer than 24 from a valve or drain shall have sensitivity in the range of 4 to 10 gallons per minute and a static pressure of 175 psi for 1 1 1 or 2 CPVC pipes per UL The detector shall respond to in the specified direction after a preset time delay of between 0 and 90 seconds that is adjustable The delay mechanism shall be a sealed mechanical pneumatic unit with visual audible indication of actuation The actuation mechanism shall include an ethylene vinyl vane inserted through a hole in the pipe and connected by a mechanical linkage to the mechanism shall consist of dual SPDT switches Form C contacts Two conduit entrances for fittings of commonly used electrical conduit shall be provided on the detectors A provision is provided Unless noted enclosures shall be NEMA 4 listed by Laboratories Inc All detectors shall be listed by Underwriters Laboratories Inc for or outdoor use