Description 

The System Sensor WFD25N is a vane-type water flow switch designed for 2-1/2 inch steel pipe in wet fire sprinkler systems. It detects water movement within the piping network and provides electrical signaling for fire alarm activation. The unit features a NEMA 4 enclosure for indoor and outdoor installations and supports pressure ratings up to 450 PSI.

Technical Specifications 

Information About WFD25N

The WFD25N is a mechanical vane-type waterflow detector developed for installation on Schedule 7 through 40 steel pipe. It operates by inserting a vane into the pipe, which activates internal switch contacts when water flow reaches a specified threshold. The device includes a pneumatic retard mechanism adjustable from 0 to 90 seconds to reduce nuisance alarms caused by transient pressure changes. Designed for fire protection systems, it is UL Listed and FM Approved for use in wet-pipe sprinkler applications.

Key Features:

• 2-1/2″ Pipe Compatibility: Designed for Schedule 7–40 steel pipe installations.

• Vane-Type Detection: Mechanical vane senses water flow within the pipe.

• Adjustable Pneumatic Delay: 0–90 second retard mechanism reduces false alarms.

• Dual SPDT Contacts: Two Form C contacts rated 10 A at 125/250 VAC.

• NEMA 4 Enclosure: Weather-resistant housing for indoor and outdoor use.

• 450 PSI Pressure Rating: Suitable for high-demand fire protection systems.

• Flexible Mounting: Supports horizontal or vertical pipe installation.

• UL and FM Approved: Certified for fire sprinkler system applications.

The WFD25N delivers the reliability and precision required for fire sprinkler water flow detection and alarm system integration.