4" (101.6 mm) Flow Switch - Waterflow Detector by System Sensor | UL & FM Approved!

4" (102 mm) Flow Switch sounds the alarm during fire sprinkler system flows with a time delay to prevent false positives.
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Part NumberSizeCompatible PipingTemperature Rating
WFD4 4" (101.6 mm) Schedule 7 to Schedule 40 32F to 150F (0C to 49C)
Overall DimensionsUL Pressure RatingTriggering Threshold Bandwidth Flow RateMaximum Surge
4.6"H x 6.8"W (116.8 mm x 172.7 mm) 450 PSI 4 Gallons to 10 Gallons Per Minute 18 Feet Per Second
Conduit EntranceEnclosure RatingWarrantyAvailability
Two (2) 1/2" Conduits (Open and Knockout Type) UL NEMA 4 3 Years Usually ships within 48 hours

Product Description

4" (101.6 mm) Flow Switch is designed to detect fire sprinkler activations and send an alarm to a fire alarm panel and/or local fire authorities when water flows through fire system piping. Manufactured by System Sensor, a global fire alarm systems expert, this 4" (101.6 mm) WFDN-Series Waterflow Detector is designed for indoor and outdoor use in commercial, residential and industrial water-based systems.

This 4" (101.6 mm) Flow Switch is suitable for high and low temperatures and installs either vertically or horizontally on piping from Schedule 7 to Schedule 40. The NEMA 4-rated enclosure insulates electrical components and resists corrosion while giving installers and inspectors a clear view of flow direction.

The built-in timer on each 4" (101.6 mm) Flow Switch delays alarm activation and reduces the number of false alarms caused by pressure surges or trapped air. Choosing a delay setting of up to 90 seconds is easy as turning the timer dial.

4" (101.6 mm) Flow Switch includes features that make installation and setup in low-light environments simple, including high-contrast pad-printed markings, set-by-feel timer tabs, and raised texured lettering. Tamper switch covers (sold separately) snap into place and UL-listed models of the 4" (101.6 mm) WFDN-Series Waterflow Detector feature tamper-resistant cover screws that prevent unauthorized entry.

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