COVER
4.9"
9.5"
LOCKING
SCREW
HEX ADJUST
SCREW
1/4" HEX HEAD
COVER
TAM PER
SET SCREW
(WRENCH
PROVIDED)
ADJUSTMENT
WHEEL
COVER
(WRENCH
PROVIDED)
MAIN ADJUSTMENT
WHEEL (TURN
COUNTERCLOSKWISE
TO INCREASE
PRESSURE)
1/2" NPT
EPS40EXP and EPS120EXP Explosion Proof
Supervisory Pressure Switches
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Important
Please Read Carefully and Save
This instruction manual contains important information about
the installation and operation of supervisory pressure switches.
Purchasers who install switches for use by others must leave this
manual or a copy of it with the user.
Read all instructions carefully before installation, following only
those instructions that apply to the model you are installing.
Before installing any alarm device, be thoroughly familiar with:
NFPA 72: National Fire Alarm Code
NFPA 13: Installation of Sprinkler Systems
NFPA 25: Inspection, Testing, and Maintenance of Water-
based Fire Protection Systems
Other applicable NFPA standards, local codes, and the require-
ments of the authority having jurisdiction.
Failure to follow these directions may result in failure of the
device to report an alarm condition. Safe Signal is not respon-
sible for devices that have been improperly installed, tested, or
maintained.
Specifications
Contact Ratings:
10 A, 1/2 HP @ 125/250 VAC
2.5A @ 6/12/24 VDC
Operating Temperature Range:
–40°F to +160°F
EPS40EXP EPS120EXP
Maximum Service Pressure (in PSI):
250
250
Adjustment Range:
10-100
10-200
Approximate Differential:
3 PSI @ 10 PSI
3 PSI @ 10 PSI
8 PSI @ 100 PSI
9 PSI @ 200 PSI
Enclosure Rating:
NEMA Type 4 — Indoor/Outdoor use
Hazardous Atmospheres
Classification:
Class I, Groups B, C, D, Div. 1
Class II, Groups E, F, G, Div. 1
Class III, Div. 1
Operation
As pressure changes, a diaphragm actuates 2 snap action switch-
es. The pressure switch actuation is determined by adjustment
settings.
Figure 1. Pressure switch basic dimensions:
W0174-00
I56-1428-C
1
I56-1428-C
4/21
