Need a replacement fire sprinkler system part? Our trained staff will help you find the right part, the first time. Call us at 888-361-6662.

2 1/2" (63.5 mm) Flow Switch - Waterflow Detector by System Sensor | UL & FM Approved!

2 1/2" (63.5 mm) Flow Switch with 450 PSI pressure rating sounds the alarm during fire sprinkler system flows with a time delay to prevent false positives.
  • Buy 2 for $156.28 each and save 5%
  • Buy 5 for $148.05 each and save 10%
  • Buy 10 for $139.83 each and save 15%
Part NumberSizeCompatible PipingTemperature Rating
WFD25 2.5" (63.5 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 4.6"W (116.8 mm x 116.8 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

2 1/2" (63.5 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 2 1/2" (63.5 mm) WFDN-Series Waterflow Detector is designed for indoor and outdoor use in commercial, residential and industrial water-based systems.

This 2 1/2" (63.5 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 2 1/2" (63.5 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.

2 1/2" (63.5 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 2 1/2" (63.5 mm) WFDN-Series Waterflow Detector feature tamper-resistant cover screws that prevent unauthorized entry.

Write Your Own Review
You're reviewing:2 1/2" (63.5 mm) Flow Switch - Waterflow Detector by System Sensor | UL & FM Approved!
Your Rating