System Sensor EPS40-1 is a low pressure supervisory switch with one SPDT (Form C) switch, for dry pipe systems, pressure tanks and the water pressure supplies of automatic water control valves. It is factory set for a nominal 40 psi system and operates at 30 psi on decreasing pressure, with field adjustment from 10 to 100 psi.
The adjustment wheel needs no special tools, a reinforced diaphragm resists pressure spikes, and the switch has two conduit entrances. The weatherproof enclosure is rated UL 4X / NEMA 4 for indoor or outdoor use when used with proper fittings and conduit, and the cover uses tamper-resistant screws.
Specifications
| Switch |
One SPDT (Form C) |
| Contact ratings |
10.0 A, 1/2 HP at 125/250 VAC; 2.5 A at 6/12/24 VDC |
| Adjustment range |
10 to 100 psi |
| Factory setting |
30 psi on decreasing pressure |
| Differential |
About 3 psi at 10 psi, 6 psi at 100 psi |
| Maximum operating pressure |
300 psi |
| Pressure connection |
1/2 in. NPT male |
| Enclosure |
UL 4X, NEMA 4, indoor or outdoor |
| Operating temperature |
-40°F to 160°F (-40°C to 71°C) |
| Dimensions |
5.12 in. H x 3.325 in. W x 4.250 in. L |
| Shipping weight |
1.2 lb (0.54 kg) |
| Warranty |
3 years |
Installation notes
- Connect into the air supply line on the system side of any shut-off valve
- Wire to the supervisory circuit of the fire alarm control panel
- One knockout and one open hole for 1/2 in. conduit fittings, plus a ground screw
- Optional 546-8000 cover tamper switch on UL models
- Service use: NFPA 13, 13D, 13R and NFPA 72
Related models
- EPS40-2: high/low pressure switch, two SPDT
- EPSA40-1: ULC model
FAQ
What pressure is the EPS40-1 set to from the factory?
It is factory set for a nominal 40 psi system and operates on decreasing pressure at 30 psi. Sensitivity can be adjusted from 10 to 100 psi with the adjustment wheel, no special tools needed.
What is the difference between the EPS40-1 and the EPS40-2?
The EPS40-1 has one SPDT switch for low pressure. The EPS40-2 has two SPDT switches, factory set at 50 psi rising and 30 psi decreasing.
What are the contact ratings?
10.0 A, 1/2 HP at 125/250 VAC and 2.5 A at 6/12/24 VDC.
Can it be installed outdoors?
Yes. The enclosure is rated UL 4X / NEMA 4 for indoor or outdoor use, from -40°F to 160°F. A cover tamper switch, P/N 546-8000, is optional on UL models.
