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
Adjustments To Factory Settings
Table 2.
Dual-switch Model — EPS40EXP and EPS120EXP
1. Install pressure switch as stated in “INSTALLATION”
portion of instruction manual. Attach pressure test
source to system.
2. Remove adjustment wheel cover and back off locking
screw (see Figure 1) to allow main adjustment wheel to
rotate freely.
3. Option 1: To adjust the nominal setting of the pressure
window (low switch setting to high switch setting)
without affecting the size of the window, adjust the
main adjustment wheel, Figure 1, to the desired setting
using the pressure source to verify each switch setting.
Each tine on the wheel represents an approximate window shift of 1.8 PSI for the EPS40EXP and 6.6 PSI for the
EPS 120EXP. For each 1/2 rotation of the adjustment
wheel, the window changes by approximately 11 PSI for
the EPS 40EXP and 40 PSI for the EPS 120EXP.
Option 2: To adjust the pressure window size and the
nominal setting of the pressure window, adjust the main
adjustment wheel, Figure 1, until the high switch (SW1)
trips at the desired pressure using the pressure test
source. Decrease the pressure until the low switch
(SW2) trips. Note pressure and determine how much
change is desired on the low switch. Adjust the 1/4″hex
screw, Figure 1, to either increase (counterclockwise) or
decrease (clockwise) the window size. (The low switch
will be affected.) The approximate sensitivity of the hex
screw adjustment: 1/2 turn = 5 PSI. An approximate
maximum window size of 30 PSI is obtainable. Retest
the high switch after adjusting the low switch.
4. Retest the set points several times to ensure the accuracy of the settings.
5. Re-seat locking screw.
6. Re-install adjustment wheel cover.
NOTE: The sensor assembly is not field replaceable. Do
not attempt to disassemble these parts. If you have
any questions, consult System Sensor. System
Sensor recommends careful consideration of the
following factors when specifying and installing
Alarm and Supervisory Pressure Switches. Always
refer to the Installation and Maintenance
Instruction for specific recommendations on individual devices before installing the unit.
• Electrical ratings stated in literature and on nameplates should not be exceeded.
•Overload on switch can cause failure on the first
cycle. Always wire devices according to national and
local electrical codes.
• Install units away from shock and vibration. Proper
electrical fittings should be used to prevent moisture
from entering the enclosure via the conduit.
•Test all devices for proper operation after initial installation. Perform preventive maintenance and periodic
testing as required by the applicable NFPA standards
but not less than bi-monthly.
• Install a back-up control for all critical applications
where control failure could endanger life or property.
A backup control to serve as a high or low limit control is especially recommended for applications where
a runaway condition could result.
• Do not mount unit where ambient temperatures will
exceed published limits.
•Avoid impact or mechanical loading.
FACTORY SETTINGS ( PSI)
MODEL Fall Sw2 Nominal Rise Sw1
(Low Switch) (Hi Switch)
EPS40EXP 30 ± 1.5 40 50 ± 2.5
EPS120EXP 101.5 - 112.5 115 117.5 - 128.5
D770-26-00 3 I56-1428-001R
D770-26-00 4 I56-1428-001R
© System Sensor 2002
Three-Year Limited Warranty
System Sensor warrants its enclosed pressure switch to be free from
defects in materials and workmanship under normal use and service for a
period of three years from date of manufacture. System Sensor makes no
other express warranty for this pressure switch. No agent, representative,
dealer, or employee of the Company has the authority to increase or alter
the obligations or limitations of this Warranty. The Company’s obligation
of this Warranty shall be limited to the repair or replacement of any part
of the pressure switch which is found to be defective in materials or workmanship under normal use and service during the three year period commencing with the date of manufacture. After phoning System Sensor’s toll
free number 800-SENSOR2 (736-7672) for a Return Authorization number,
send defective units postage prepaid to: System Sensor, Return
Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174.
Please include a note describing the malfunction and suspected cause of
failure. The Company shall not be obligated to repair or replace units
which are found to be defective because of damage, unreasonable use,
modifications, or alterations occurring after the date of manufacture. In no
case shall the Company be liable for any consequential or incidental damages for breach of this or any other Warranty, expressed or implied whatsoever, even if the loss or damage is caused by the Company’s negligence
or fault. Some states do not allow the exclusion or limitation of incidental
or consequential damages, so the above limitation or exclusion may not
apply to you. This Warranty gives you specific legal rights, and you may
also have other rights which vary from state to state.
Please refer to insert for the Limitations of Fire Alarm Systems
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