Potter PS40 SERIES User manual

MFG. #5400930 - REV E
09/12
PRINTED IN USA PAGE 1 OF 3
PS40 SERIES
SUPERVISORY PRESSURE SWITCH
Installation
The Potter PS40 Series Supervisory PressureActuated Switches are designed
primarily to detect an increase and/or decrease from normal system pressure
in automatic re sprinkler systems. Typical applications are: Dry pipe
systems, pre-action air/nitrogen supervision, pressure tanks, air supplies,
and water supplies. The PS40 switch is factory set for 40 PSI (2,8 BAR)
normal system pressure. The switch marked with the word LOW is set to
operate at a pressure decrease of 10 PSI (,7 BAR) at 30 PSI (2,1 BAR). The
switch marked with the word HIGH is set to operate at a pressure increase
of 10 PSI (,7 BAR) at 50 PSI (3,5 BAR). See section heading Adjustments
and Testing if other than factory set point is required.
1. Connect the PS40 to the system side of any shutoff or check valve.
2. Apply Teon tape to the threaded male connection on the device.
(Do not use pipe dope)
3. Device should be mounted in the upright position.
(Threaded connection down)
4. Tighten the device using a wrench on the ats on the device.
Wiring Instructions
1. Remove the tamper resistant screw with the special key provided.
2. Carefully place a screwdriver on the edge of the knockout and sharply
apply a force sufcient to dislodge the knockout plug. See Fig. 9
3. Run wires through an approved conduit connector and afx the
connector to the device. A NEMA-4 rated conduit tting is
required for outdoor use.
UL, cUL, and CSFM Listed, FM and LPC Approved, NYMEA
Accepted, CE Marked
Dimensions: 3.78" (9,6cm)W x 3.20" (8,1cm)D x 4.22" (10,7cm)H
Conduit Entrance: Two knockouts provided for 1/2" conduit. Individual
switch compartments and ground screw suitable for
dissimilar voltages
Enclosure: Cover- Die-cast with textured red powdercoat nish, single
cover screw and rain lip.
Base- Die-cast
Pressure Connection: Nylon 1/2" NPT male
Factory Adjustment: PS40-1 operates on decrease at 30 PSI (2,1 BAR)
PS40-2 operates in increase at 50 PSI (3,5 BAR)
and on decrease at 30 PSI (2,1 BAR)
Pressure Range: 10-60 PSI (,7 - 4,1 BAR)
Differential: Typical 1 lb. at 10 PSI (,07 at ,7 BAR)
4 lbs at 60 PSI (,28 at 4,1 BAR)
Maximum System Pressure: 300 PSI (20,68 BAR)
Switch Contacts: SPDT (Form C)
10.1 Amps at 125/250VAC, 2.0 Amps at 30VDC
One SPDT in PS40-1, Two SPDT in PS40-2
Environmental Specications:
NEMA 4/IP66 Rated Enclosure - indoor or outdoor when used
with NEMA 4 conduit ttings.
Temperature range: -40°F to 140°F (-40°C to 60°C)
Tamper: Cover incorporates tamper resistant fastener that requires a
special key for removal. One key is supplied with each device.
For optional cover tamper switch kit, order Stock No. 0090200.
See bulletin #5401200 PSCTSK.
Service Use:
Automatic Sprinkler NFPA-13
One or two family dwelling NFPA-13D
Residential Occupancy up to four stories NFPA-13R
National Fire Alarm Code NFPA-72
Potter Electric Signal Company, LLC • St. Louis, MO • Phone: [phone]/Canada 888-882-1833 •www.pottersignal.com
Ordering Information
Model Description Stock No.
PS40-1 Pressure switch with one set SPDT contacts 1340403
PS40-2 Pressure switch with two sets SPDT contacts 1340404
Hex Key 5250062
Cover Tamper Switch Kit 0090200
BVL Bleeder valve 1000018
4. Connect the wires to the appropriate terminal connections for the
service intended. See Figures 2,4,5,6, and 8
Adjustment And Testing
The operation of the pressure supervisory switch should be tested upon
completion of installation and periodically thereafter in accordance with
the applicable NFPA codes and standards and/or the authority having
jurisdiction (manufacturer recommends quarterly or more frequently).
Note: Testing the PS40 may activate other system connected devices.
The use of a Potter BVL (see product bulletin 8900067 for details) is
recommended to facilitate setting and testing of the PS40 pressure switch.
When a BVL (bleeder valve) is used, the pressure to the switch can be
isolated and bled from the exhaust port on the BVL without effecting the
supervisory pressure of the entire system. See Fig. 3
The operation point of the PS40 Pressure Switch can be adjusted to any
point between 10 and 60 PSI (0,7 - 4,11 BAR) by turning the adjustment
knob(s) clockwise to raise the actuation point and counter clockwise to
lower the actuation point. In the case of the PS40-2, both switches operate
independent of each other. Each switch may be independently adjusted to
actuate at any point acrosss the switch adjustment range. Initial adjustment
can be made with a visual reference from the top of the adjustment knob
across to the printed scale on the switch bracket. Final adjustments should
be veried with a pressure gauge.

MFG. #5400930 - REV E
09/12
PRINTED IN USA PAGE 2 OF 3
PS40 SERIES
SUPERVISORY PRESSURE SWITCH
Typical Sprinkler Applications
Switch Clamping Plate TerminalDimensions
OUTGOING INCOMING
DWG# 923-3
Fig. 1 Fig. 2
Fig. 3
GONG
MOTOR
WATER
TEST
BY-PASS
WATER
VALVE
OS & Y
VALVE
ALARM
PRESSURE
SWITCH
PS10
CHECK
VALVE
VALVE
CHECK
BVL
VALVE
TEST
BLEEDER
AIR LINE
SHUT-OFF
VALVE
PS40 SUPERVISORY PRESSURE SWITCH
DWG. #924-1A
RBVS
DRY PIPE
VALVE
Typical Connections
Fig. 4
An uninsulated section of a single conductor
should not be looped around the terminal and
serve as two separate connections. The wire
must be severed, thereby providing supervision
of the connection in the event that the wire
becomes dislodged from under the terminal.
NOTE: To prevent leakage, apply Teflon tape sealant to male threads only.
2.87
[72.97]
4.22
[107.19]
2.48
[62.87]
3.78
[95.89]
3.20
[81.28]
1.60
[40.64]
GROUND
SCREWS
DWG# 930-1
1/2" NPT
ADJUSTMENT
KNOB
COM1 2
EOLR
TO FIRE
ALARM
PANEL
TO FIRE
ALARM
PANEL
COM
12
2
1
COM
HIGH
AIR
LOW
AIR
PS40-1PS40-2
WITH NORMAL SYSTEM PRES-
SURE APPLIED LOW -TERMINAL 2
CLOSES ON PRESSURE DROP.
WITH NORMAL SYSTEM
PRESSURE APPLIED HIGH
- TERMINAL 1 WILL CLOSE
ON PRESSURE INCREASE.
EOLR
DWG# 930-2
Closing of any shutoff valves between the alarm
check valve and the PS10 will render the PS10
inoperative. To comply with IBC, IFC, and
NFPA-13, any such valve shall be electrically
supervised with a supervisory switch such as
Potter Model RBVS.

MFG. #5400930 - REV E
09/12
PRINTED IN USA PAGE 3 OF 3
PS40 SERIES
SUPERVISORY PRESSURE SWITCH
DWG# 928-4
Break out thin section of divider to provide path for wires
when wiring both switches from one conduit entrance.
One Conduit Wiring
Fig. 6
Fig. 8
DWG#928-5
Fig. 9
Removing Knockouts
C
C
C12
C12
LOW PRESSURE SWITCH
HIGH PRESSURE SWITCH
DWG# 930-3
Changing Pressure
Low Pressure Signal Connection
EOLR
TO FIRE ALARM PANEL
DWG# 928-1
EOLR
TO FIRE ALARM PANEL
DWG# 928-2
High Pressure Signal Connection
Fig. 5 Fig. 7
(With normal system pressure)
Engineer/Architect Specications Pressure Type Waterow Switch
Pressure type supervisory switches; shall be a Model PS40 as manufactured by
Potter Electric Signal Company, St. Louis, MO., and shall be installed on the re
sprinkler system as shown and or specied herein.
Switches shall be provided with a 1/2" NPT male pressure connection to be
connected into the air supply line on the system side of any shut-off valve. A
Model BVL bleeder valve as supplied by Potter Electric Signal Company of St.
Louis, MO., or equivalent shall be connected in line with the PS40 to provide a
means of testing the operation of the supervisory switch. (See Fig. 3)
The switch unit shall contain SPDT (Form C) switch(es). One switch shall be
set to operate at a pressure decrease of 10 PSI (0,7 BAR) from normal. If two
switches are provided, the second switch shall be set to operate at a pressure
increase of 10 PSI (0,7 BAR) from normal.
Switch contacts shall be rated at 10.1 Amps at 125/250VAC and 2.0 Amps at
30VDC. The units shall have a maximum pressure rating of 300 PSI (20,68 BAR)
and shall be adjustable from 10 to 60 PSI (0,7 to 4,1 BAR).
Pressure switches shall have two conduit entrances, one for each individual switch
compartment to facilitate the use of dissimilar voltages for each individual switch.
The cover of the pressure switch shall be zinc die-cast with rain lip and shall attach
with one tamper resistant screw. The pressure switch shall be suitable for indoor or
outdoor service with a NEMA-4/IP66 rating.
The pressure switch shall be UL, ULC, and CSFM listed, FM and LPC approved
and NYMEA accepted.
•Installation must be performed by qualied personnel and in accordance with all
national and local codes and ordinances.
•Shock hazard. Disconnect power source before servicing. Serious injury or death
could result.
•Read all instructions carefully and understand them before starting installation.
Save instructions for future use. Failure to read and understand instructions could
result in improper operation of device resulting in serious injury or death.
•Risk of explosion. Not for use is hazardous locations. Serious injury or death could result.
•Do not tighten by grasping the switch enclosure. Use wrenching ats on the bushing
only. Failure to install properly could damage the switch and cause improper operation
resulting in damage to equipment and property.
•To seal threads, apply Teon tape to male threads only. Using joint compounds or
cement can obstruct the pressure port inlet and result in improper device operation and
damage to equipment.
•Do not over tighten the device, standard piping practices apply.
•Do not apply any lubricant to any component of the pressure switch.
Terminal
C: Common
1: Closed when installed
under normal system
pressure.
2: Open when installed
under normal system
pressure. Closes on
pressure drop. Use for
low air signal.
Terminal
1: Open when installed
under normal system
pressure. Closes on
increase in pressure.
Use for high air signal.
2: Closed under normal
system pressure.

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