Safe Signal WFD40EXP Waterflow Detector 4 Inches Explosion-Proof (UL/ULC)
The Safe Signal WFD40EXP is an explosion-proof vane-type waterflow detector for 4 in steel sprinkler pipe, schedule 10 through 40. It is approved for hazardous locations classified Class I Groups B, C, D; Class II Groups E, F, G; and Class III, Divisions 1 and 2. Flow of 4 to 10 GPM or more operates two synchronized SPDT switches after a field-adjustable, sealed mechanical time delay; the housing is NEMA 4 rated cast aluminum for indoor or outdoor use.
Key Features
- Explosion-proof waterflow detector for 4 in pipe
- Hazardous locations: Class I, Div. 1 & 2, Groups B, C, D; Class II, Div. 1 & 2, Groups E, F, G; Class III, Div. 1 & 2
- Rugged NEMA 4 cast aluminum housing, indoor or outdoor use
- Sensitivity-setting spring mechanism located outside the explosion environment
- Sealed, field-adjustable retard (time delay) mechanism
- Two sets of synchronized SPDT (Form C) contacts
- Visual switch activation
- Field-replaceable terminal block and retard mechanism
- Only one conduit entrance required for hook-up
- UL listed
Specifications
| Pipe size |
4 in |
| Hole size |
2 in |
| Compatible pipe |
Steel, schedule 10 through 40 |
| Static pressure rating |
450 psi max. |
| Flow sensitivity |
4 to 10 GPM |
| Maximum surge |
18 ft/s |
| Contact ratings |
Two sets SPDT (Form C): 10.0 A @ 125/250 VAC; 2.5 A @ 24 VDC |
| Conduit entrances |
Two openings for 1/2 in conduit (one knockout type) |
| Operating temperature (spec table) |
32°F to 120°F (0°C to 49°C) |
| Enclosure rating |
NEMA 4 |
| Overall dimensions |
6 in H x 9 in L x 6.5 in W |
| Weight |
11.5 lb |
| Warranty |
3 years |
Compatible With
- 4 in schedule 10-40 steel sprinkler pipe
- Fire alarm control panel initiating circuits
- A3008-0 replacement retard mechanism
- A77-01-02 replacement terminal block
Documents & Downloads
