System Sensor EPS40EXP, EPS120EXP User Manual
4.9"
9.5"
LOCKING
SCREW
HEX ADJUST
SCREW
1/4" HEX HEAD
COVER
TAMPER
SET SCREW
(WRENCH
PROVIDED)
ADJUSTMENT
WHEEL
COVER
(WRENCH
PROVIDED)
MAIN ADJUSTMENT
WHEEL (TURN
COUNTERCLOSKWISE
TO INCREASE
PRESSURE)
1/2" NPT
D770-26-00 1 I56-1428-001R
EPS40EXP and EPS120EXP Explosion Proof
Supervisory Pressure Switches
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
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
requirements of the authority having jurisdiction.
Failure to follow these directions may result in failure of the
device to report an alarm condition. System Sensor is not
responsible 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
switches. The pressure switch actuation is determined by
adjustment settings.
Figure 1. Pressure switch basic dimensions:
BREAK WIRE AS SHOWN FOR
SUPERVISION OF CONNECTION.
DO NOT ALLOW STRIPPED WIRE
LEADS TO EXTEND BEYOND
SWITCH HOUSING. DO NOT
LOOP WIRES.
A78-2346-02
D770-26-00 2 I56-1428-001R
Installation
1.
Back out cover tamper set screw and remove cover (Fig. 1).
2. Mounting the Switch
The device is designed to be mounted in the upright position; side mounting is also acceptable. Locate it where
vibration, shock, and mechanical loading are minimal.
Refer to piping diagram above (Figures 2 and 3).
a. Mount the device directly to the line via the 1/2″NPT
pressure connection. The use of teflon pipe sealant
tape is recommended. Be sure the fitting is tight
enough to prevent leaks.
A78-2397-00
Figure 3. Typical piping diagram for EPS120EXP
DRY
PIPE
VALVE
OS & Y
VALVE
WATER
BY-PASS
TEST
VALVE
LOCAL ALARM
SHUT OFF
VALVE
WATER
MOTOR
GONG
CHECK
VALVE
EPS40EXP
CHECK
VALVE
AIR LINE
SHUT-OFF
VALVE
INSTALL
BLEEDER
VALVE FOR
TESTING
EPS10EXP
DRY SYSTEM
WIRE TO SUPERVISORY
CIRCUIT OF FIRE ALARM
CONTROL PANEL
WIRE TO ALARM
INDICATING CIRCUIT
OF FIRE ALARM
CONTROL PANEL
TO
SPRINKLER
SYSTEM
Table 1. Electrical connections (referenced at
factory settings):
b. Apply tightening torque to the brass hex portion of
the device.
High voltage. Electrocution hazard. Do not handle live AC
wiring or work on a device to which AC power is applied.
Doing so may result in severe injury or death.
3. Wire the device in accordance with the National
Electrical Code. Two 1/2″NPT conduit entry holes have
been provided in the mounting base to accept explosion
proof conduit fittings. If necessary, remove conduit entry
plug with 3/8” square wrench.
4. Connect wiring to terminals (see Figure 4 and Table 1).
CAUTION
WET
SYSTEM
ALARM
CHECK
VALVE
OS & Y
VALVE
OS & Y
VALVE
WATER
BY-PASS
VALVE
AIR
PRESSURE
SUPPLY
BLEEDER
TEST
VALVE
EPS120EXP
LOCAL ALARM
SHUT OFF
VALVE
RETARD
WATER
MOTOR
GONG
A78-2398-02
COMMON
TERMINAL
SWITCH #2
(LOW SWITCH)
TERMINAL
“B”
GROUND
SCREW
Figure 4. Switch location:
WARNING
To prevent ignition of hazardous atmospheres, disconnect
circuits before removing cover. Keep cover closed while circuits are live. Conduit runs must have sealing fittings connected within 18” of the enclosure.
SWITCH #1
(HIGH SWITCH)
Figure 2. Typical piping diagram for EPS40EXP
SW2SW1
SWITCHES AT NORMAL SYSTEM PRESSURE
SWITCHES AT LOW TRIP POINT
SW1 SW2
MODELS EPS40EXP, EPS120EXP
SWITCHES AT HIGH TRIP POINT
SW1 SW2
B
COM
A
B
COM
A
B
COM
A
A
COM
B
A
COM
B
A
COM
B