SYSTEMSENSOR EPSA120-1

EPS120-1 and EPS120-2
Supervisory
Pressure Switches
System Sensor EPS120 Series switches are designed to
supervise system air pressure in pipes or pressure tanks,
as well as water or air pressure supplies of automatic
water control valves.
Features
The EPS120-1 has a single SPDT switch while the EPS120-2 model
contains two SPDT switches. The EPS120 Series features field
adjustable pressure sensitivity to provide an alarm response between
10 and 200 psi. All models are factory set for use in a nominal 115
psi system. The EPS120-1 is factory set to respond at 105 psi at
decreasing pressure while the EPS120-2 is factory set to respond at
125 psi on rising pressure and 105 psi on decreasing pressure. The
pressure adjustment wheel requires no special tools and does not
affect switch synchronization on the EPS120-2.
• Pressure adjustment wheel, no special tools required
• Field adjustable pressure sensitivity
• Factory set for use in a nominal 115 psi system
• Reinforced diaphragm resists pressure spikes
• Two conduit entrances provided
• NEMA 4 rated
Agency Listings
VdS
S739
CS169
7770-1209:147
3005863
167-93-E
G4020027
EPS120 Series Specifications
Architectural/Engineering Specifications
Model shall be an EPS120-1 or EPS120-2 pressure type waterflow switch as manufactured by System Sensor of St. Charles, IL. They shall be installed on the
sprinkler system with connection as shown on the drawings and/or as specified herein. Pressure switches shall be of the bellows-activated type. Switches shall
have a maximum service pressure rating of 250 psi and shall be adjustable from 10–200 psi. There shall be one (1) or two (2) SPDT contacts rated at 10.0 Amp @
125/250 VAC and 2.5 Amp @ 6/12/24 VDC. The contractor shall furnish and install, where indicated on the plans, pressure switches according to appropriate NFPA
standards. Switches shall be provided with a ½˝ NPT male pressure connection to be connected into the air supply line on the system side of any shut-off valve.
Switches shall provide 1 knockout type and 1 open hole for ½˝ conduit fitting attachment and a ground screw provision for electrical grounding. The switch
enclosure shall be weatherproof and carry a UL 4x/NEMA 4 rating when used with proper electrical fittings and conduit. The cover shall incorporate tamperresistant screws. The unit shall be listed by Underwriters Laboratories, Inc. and Underwriters Laboratories of Canada, Inc. and approved by Factory Mutual.
Physical/Operating Specifications
Maximum Operating Pressure
250 psi
Differential
Approximately 3 psi @ 10 psi, 9 psi @ 200 psi
Pressure Connection
1/2” NPT male
Enclosure
Rated UL 4x, NEMA 4 for indoor or outdoor use
Maximum Adjustment Pressure
100 to 200 psi
Dimensions
5.12˝ H × 3.325˝ W × 4.250˝ L
Range
(13.0 cm × 8.4 cm × 10.8 cm)
Operating Temperature Range
Indoor or outdoor use
Cover Tamper Switch
UL Models: Optional P/N 546-8000
–40°F to 160°F (–40°C to 71°C)
ULC Models: Factory Installed
Factory Setting
EPS120-1 operates at decreasing
Service Use
Automatic Sprinkler: NFPA 13
pressure at 105 psi EPS120-2 operates
One or Two Family Dwelling: NFPA 13D
at increasing pressure at 125 psi and
Residential Occupancies up to 4 Stories: NFPA 13R
decreasing pressure at 105 psi
National Fire Alarm Code: NFPA 72
Switch Contact Ratings
EPS120-1: One set SPDT (Form C)
Shipping Weight
1.2 lbs. (.54 Kg)
EPS120-2: Two sets SPDT (Form C)
Warranty
3 years
10.0 A, 1/2 HP @ 125/250 VAC
2.5 A @ 6/12/24 VDC
Pressure Switch Basic Dimensions
Electrical Connections
41/4″
MODELS EPS120-1
MODELS EPS120-2
SWITCHES AT 105 P.S.I. (LOW TRIP PT.)
B
B
COM
COM
A
A
SW1
SW2
CO
SWITCH AT 115 P.S.I. (NORMAL)
M
B
COM
A
A
GROUND
SCREW
(GREEN)
HEX
ADJUSTMENT
SCREW
SWITCH #2
B
SWITCH AT 105 P.S.I. (LOW TRIP PT.)
SWITCHES AT 115 P.S.I. (NORMAL)
B
COM
A
51/8″
B
COM
A
MAIN ADJUSTMENT
WHEEL
SW1
SWITCH 1
LOCKING
SCREW
1/2″
B
COM
A
SW2
SWITCHES AT 125 P.S.I. (HIGH TRIP PT.)
B
COM
A
NPT
B
COM
A
SW1
SW2
Typical Sprinkler Applications
EPS120
WIRE TO SUPERVISORY
CIRCUIT OF FIRE ALARM
CONTROL PANEL
EPS10
WIRE TO ALARM
INDICATING CIRCUIT
OF FIRE ALARM
CONTROL PANEL
EPS120
TO
SPRINKLER
SYSTEM
CHECK
VALVE
INSTALL
BLEEDER
VALVE FOR
TESTING
DRY
PIPE
VALVE
AIR LINE
SHUT-OFF
VALVE
OS & Y
VALVE
CHECK
VALVE
WATER
BY-PASS
TEST
VALVE
WATER
MOTOR
GONG
BLEEDER
TEST
VALVE
WET
SYSTEM
ALARM
CHECK
VALVE
WATER
MOTOR
GONG
LOCAL ALARM
SHUT OFF
VALVE
OS & Y
VALVE
DRY SYSTEM
OS & Y
VALVE
RETARD
WATER
BY-PASS
VALVE
LOCAL ALARM
SHUT OFF
VALVE
WET SYSTEM
Ordering Information
UL Model No.
EPS120-1
EPS120-2
Replacement Parts
S07-66-XX
WFDW
ULC/Canadian Model No.
EPSA120-1
EPSA120-2
Description
Low pressure supervisory switch, one SPDT, 10–200 PSI
High/low pressure supervisory switch, two SPDT, 10–200 PSI
Replacement tamper screws for cover of EPS
Replacement tamper proof wrench for cover of EPS
546-8000
3825 Ohio Avenue • St. Charles, IL 60174
Phone: 800-SENSOR2 • Fax: 630-377-6495
Cover tamper switch for EPS Series
©2007 System Sensor.
Product specifications subject to change without notice. Visit systemsensor.com for
current product information, including the latest version of this data sheet.
A05-0939-005 • 4/07 • #1676