Safe Signal EPS10-1 is an alarm pressure switch with one SPDT (Form C) switch, used to indicate a discharge in wet, dry, deluge and pre-action automatic sprinkler systems.
The switch connects to the alarm check valve of a wet system, the intermediate chamber of a dry system, or a pre-action or deluge valve, and operates on any flow of water equal to or greater than the discharge from one sprinkler head. It is factory set to operate at 4 to 8 psi on rising pressure, and a sensitivity adjustment wheel sets the alarm response anywhere from 4 to 20 psi with no special tools. A reinforced diaphragm resists pressure spikes. The enclosure is rated UL 4X / NEMA 4 for indoor or outdoor use and the cover uses tamper-resistant screws.
Specifications
| Switch |
One SPDT (Form C) |
| Contact ratings |
10.0 A, 1/2 HP @ 125/250 VAC; 2.5 A @ 6/12/24 VDC |
| Factory setting |
Operates at 4 to 8 psi rising pressure |
| Adjustment range |
4 to 20 psi |
| Differential |
Approximately 3 psi throughout range |
| Maximum operating pressure |
300 psi |
| Pressure connection |
1/2 in. NPT male, glass reinforced nylon |
| Operating temperature |
-40°F to 160°F (-40°C to 71°C), indoor or outdoor |
| Enclosure |
UL 4X, NEMA 4 |
| Dimensions |
5.12 in. H x 3.325 in. W x 4.250 in. L (13.0 x 8.4 x 10.8 cm) |
| Shipping weight |
1.2 lb (0.54 kg) |
| Service use |
NFPA 13, 13D, 13R and NFPA 72 |
| Certifications |
UL certified; FM approved |
Installation notes
- Install on the 1/2 in. NPT outlet of the alarm check valve (wet), the intermediate chamber (dry), or the pre-action or deluge valve.
- The adjustment wheel changes the actuation point between 4 and 20 psi; the factory setting is 4 to 8 psi.
- The housing has one knockout and one open hole for 1/2 in. conduit fittings, plus a ground screw.
- The NEMA 4 rating applies when proper electrical fittings and conduit are used.
- A cover tamper switch (P/N 546-8000) is optional on UL models.
Related models
-
EPS10-2 — same alarm pressure switch with two SPDT switches that activate simultaneously.
-
EPS40-1 / EPS40-2 — supervisory pressure switches for dry pipe systems and pressure tanks.
Documents
FAQ
Which sprinkler systems is the EPS10-1 used on?
Wet, dry, deluge and pre-action automatic sprinkler systems, to indicate a discharge from a sprinkler.
At what pressure does it operate?
It is factory set to operate at 4 to 8 psi on rising pressure, and the adjustment wheel sets the alarm response anywhere between 4 and 20 psi.
What are the contact ratings?
One SPDT (Form C) switch rated 10.0 A, 1/2 HP at 125/250 VAC and 2.5 A at 6/12/24 VDC. The EPS10-2 has two SPDT switches.
Can it be installed outdoors?
Yes. The enclosure is rated UL 4X / NEMA 4 for indoor or outdoor use, with an operating range of -40°F to 160°F.
