The System Sensor WFD20EXP is a 2-inch explosion-proof waterflow detector for hazardous locations. It mounts on 2-inch steel pipe, Schedule 10 through 40, in wet-pipe sprinkler systems. When water flows, the vane moves and the switch reports the alarm. As a result, the fire alarm panel sees sprinkler activation immediately.
Hazardous Location Ratings
The WFD20EXP carries true explosion-proof ratings. Specifically, it is rated for Class I, Divisions 1 and 2, Groups B, C, and D. It also covers Class II, Divisions 1 and 2, Groups E, F, and G. In addition, Class III, Divisions 1 and 2 are included. The sensitivity spring sits outside the explosion environment for safety.
System Sensor WFD20EXP Specifications
- Pipe size: 2-inch steel pipe, Schedule 10–40 (1-1/4 in hole)
- Maximum static pressure: 450 psi
- Flow trigger threshold: 4 to 10 GPM; 18 FPS maximum surge
- Contacts: two SPDT (Form C); 10 A at 125/250 VAC; 2.5 A at 24 VDC
- Retard: sealed pneumatic delay, field-adjustable 0 to 70 seconds
- Operating temperature: 32°F to 120°F
- Enclosure: NEMA 4 cast aluminum, indoor or outdoor
- Conduit: two 1/2-inch entries; weight 10.6 lb
Listings include UL (E200116), ULC, CSFM 7770-1653:145, FM, and MEA. However, never install it on copper pipe. Also, use it on wet-pipe systems only — not dry-pipe, deluge, or preaction service. The retard mechanism (A3008-0) and terminal block are field-replaceable. Therefore, long-term maintenance stays simple.
For more information, contact the Life Safety Consultants team at (888) 557-0558, or email us at: sales@lifesafetycom.com
Additional information
| Weight | 12 lbs |
|---|---|
| Dimensions | 15 × 12 × 9 in |
| Condition | New |
| Manufacturers | System Sensor |
| Part Type | Sensor |
