2.07 [WFD20EN] [Water Flow Detector WFDEN] [FM, LPCB, VdS, CE] 1 LR.png 2.07 [WFD20EN] [Water Flow Detector WFDEN] [FM, LPCB, VdS, CE] 3 LR.png 2.07 [WFD20EN] [Water Flow Detector WFDEN] [FM, LPCB, VdS, CE] 2 LR.png

WFDEN Water Flow Detector

  • FM Approved Logo Mid Grey 300.jpg
  • LPCB Logo Mid grey 1357g-01.jpg
  • VdS Logo mid grey 2.jpg
  • CE Logo Mid Grey 144.jpg
  • gost logo 300.jpg
Pressure Rating LPC: 17.25 BAR (250 PSI)
VdS: PN16 (16 BAR, 232 PSI)
Working Temperature 0°C to 49°C (32°F to 120°F)
Contact Ratings Two sets of SPDT (Form C)
10.0 A, ½ HP @ 125/250 VAC
2.5 A @ 6/12/24 VDC
Pipe Size 50mm to 200mm (2" to 8")
Compatible Pipe Steel water pipe, schedule 10 through 40
Conduit Entrances Two openings for 15mm (½") conduit
Cover Tamper Switch Standard with ULC models, optional for UL and European models
Enclosure Rating IP56
Maximum Surge 5.5 metres per second (18 ft/s)
Triggering Threshold 30-57 LPM (6.6-12.5 GPM)
Time Delay Adjustable 0 to 30seconds
Approvals FM Approved, LPCB, VdS, CE, Gost

The WFDEN Series waterflow detectors from System Sensor consists of a rugged, IP56-rated enclosure that is more damage resistant than previous metal designs. The waterflow detector is designed for both indoor and outdoor use, with the widest available temperature range, from 0°C to 68°C (32°F to 55°F).

Models are equipped with tamper-resistant cover screws to prevent unauthorized entry. Inside, two sets of SPDT (Form C) synchronized switches are enclosed in a durable terminal block with new layout designed to make wiring easy with wire ready terminals, COM terminals are on a different elevation, large barrier between switches and easy to read raised textured lettering all make wiring easy. An optional cover tamper switch is available, securely snaps into place, no tools required.

The WFDEN series incorporates a mechanical time delay feature, which minimizes the risk of false alarm due to pressure surges or air trapped in the fire sprinkler system. The larger and easy to turn timer dial makes setting the waterflow detector easy with high contrast pad printed markings and three tabs to help with turning.

The WFDEN series is designed for accuracy and repeatability. The detector also offers improved performance during vibration in riser applications where detectors are exposed to a large in rush of water.


Model Pipe Size Hole Size (mm)
WFD20EN 50mm (2”) 31.8 mm (1¼”)
WFD25EN 65mm (2½”)
(76mm (2”) o.d)
31.8 mm (1¼”)
WFD30EN 80mm (3”) 50.8 mm (2”)
WFD40EN 100mm (4”) 50.8 mm (2”)
WFD60EN 150mm (6”) 50.8 mm (2”)
WFD80EN 200mm (8”) 50.8 mm (2”)