Water Flow Switch

MODEL: SD-WFD SERIES

The Model SD-WFD is a vane-type waterflow switch for use on wet sprinkler systems. The water flow contains two single-pole, double-throw, snap action switches and an adjustable, instantly recycling pneumatic retard. Vane-type waterflow detectors should be installed on system piping as designated on the drawing and/or as specified herein. Detectors shall have sensitivity in the range of 4 to 10 gallons per minute and a static pressure rating of 450 psi for 2˝–8˝ pipes. The flow condition must exist for a period necessary to overcome the selected retard period, which is field adjustable. The delay mechanism shall be a sealed mechanical pneumatic unit with a visual indication of actuation. The actuation mechanism shall include a polyethene vane inserted through a hole in the pipe and connected by a mechanical linkage to the delay mechanism. Outputs shall consist of dual SPDT switches. Two conduit entrances for standard fittings of commonly used electrical conduit shall be provided on the detectors.