23 PRESSURE ALARM SWITCH PS10AMKT. #8810001 - REV V
MFG. #5400923 - 8/02
PRINTED IN USA PAGE 1 OF 2
MODEL PS10A
PRESSURE SWITCH
PS10-1A Single Switch - Stock No. 1340101
PS10-2A Double Switch - Stock No. 1340102
INSTALLATION AND TEST PROCEDURES
The Potter PS10A Series Pressure Actuated Switches are designed for
the detection of a waterflow condition in automatic fire sprinkler systems
of particular designs such as wet systems with alarm check valves or
dry pipe systems. They may also be used to provide a low pressure
supervisory signal. They may be adjusted to operate on pressure
between 4 and 20 PSI (0,27 and 0,4 BAR).
MOUNTING: Device should be mounted in upright position (threaded
connection down). Requires NEMA type 4 conduit hub for outdoor
installations.
TESTING: The operation of the pressure alarm 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 fre-
quently).
WET SYSTEM:
METHOD 1: When using PS10A and control unit with retard - connect
PS10A into alarm port piping on the input side of retard chamber and
electrically connect PS10A to control unit that provides a retard to
compensate for surges. Insure that no unsupervised shut-off valves
are present between the alarm check valve and PS10A.
METHOD 2: When using the PS10A for local bell application or with a
control that does not provide a retard feature - the PS10A must be
installed on the alarm outlet side of the retard chamber of the sprinkler
system.
TESTING: Accomplished by opening the inspector's end-of-line test
valve. Allow time to compensate for system or control retard.
CAUTION: Method 2 is not applicable for remote station service use,
if there is an unsupervised shut-off valve between the alarm check
valve and the PS10A.
WET SYSTEM WITH EXCESS PRESSURE:
Connect PS10A into alarm port piping extending from alarm check valve.
Retard provisions are not required. Insure that no unsupervised shut-
off valves are present between the alarm check valve and the PS10A.
TESTING: Accomplished by opening the water by-pass test valve or the
inspector's end-of-line test valve. When using end-of-line test, allow
time for excess pressure to bleed off.
DRY SYSTEM:
Connect PS10A into alarm port piping that extends from the intermediate
chamber of the alarm check valve. Install on the outlet side of the in-line
check valve of the alarm port piping. Insure that no unsupervised shut-
off valves are present between the alarm check valve and the PS10A.
TESTING: Accomplished by opening the water by-pass test valve.
CAUTION: The above tests may also activate any other circuit closer
or water motor gongs that are present on the system.
UL and CSFM Listed, FM and LPC Approved, NYMEA Accepted, CE
Marked
Dimensions: 4 3/4" (12,1cm)W x 2 1/4" (5,7cm)D x 4 3/8" (11,1cm)H
Enclosure:Cover - Die-cast with textured red powdercoat finish
Base - Plated Steel
Pressure Connection: 1/2" NPT Male
Factory Adjustment:
Operates on Pressure increase at 6 ±1 PSI (0,41±0,07 BAR)
Operates on Pressure decrease at 5 ±1 PSI (0,35±0,07 BAR)
Maximum Differential: 1 PSI (0,06 BAR)
Maximum System Pressure: 250 PSI (17,2 BAR)
Switch Contacts: SPDT (Form C)
15.0 Amps at 125/250VAC, 2.5 Amps at 30VDC
One set in PS10-1A, Two sets in PS10-2A
Environmental Specifications: Indoor or outdoor use
NEMA 4/IP55 Rated Enclosure - when used with proper conduit
fittings
Temperature range: -40°F to 140°F (-40°C to 60°C)
(Not for use in hazardous locations)
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
Tamper: Cover incorporates tamper resistant fasteners that require a
special key for removal. One key is supplied with each device. For optional
cover tamper switch kit, order Stock No. 0090134.
Potter Electric Signal Company • 2081 Craig Road, St. Louis, MO, 63146-4161 • Phone: 800-325-3936/Canada 888-882-1833 • www.pottersignal.com
MKT. #8810001 - REV V
MFG. #5400923 - 8/02
PRINTED IN USA PAGE 2 OF 2
MODEL PS10A
PRESSURE SWITCH
TYPICAL SPRINKLER APPLICATIONS
CAUTION:
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.
SWITCH TERMINAL CONNECTIONS
CLAMPING PLATE TERMINAL
DIMENSIONS
CAUTION:Closing of any shutoff valves between the alarm check valve and the PS10A will render the PS10A inoperative. To comply with
NFPA-72 any such valve shall be electrically supervised with a supervisory switch such as Potter Model BVS.
ENGINEER/ARCHITECT SPECIFICATIONS
Pressure type waterflow switches shall be a Model PS10A as manufactured by Potter Electric Signal Co. of St. Louis, Mo. and shall be installed
on the sprinkler systems as shown on the drawings and/or specified herein.
Switches shall be provided with a 1/2" NPT male pressure connection to be connected into the alarm check valve of a “wet” sprinkler system or
into the intermediate chamber of a “dry” pipe system and shall be actuated by any flow of water to or in excess of the discharge from one
sprinkler head.
Switches shall have a maximum service pressure rating of 250 PSI (17,2 BAR) and shall be factory adjusted to operate on pressure increase at
6 ±1 PSI (0,4 ±0,06 BAR). There shall be one (1) or two (2) SPDT contacts rated at 15.0 Amps at 125/250VAC and 2.5 Amps at 30VDC.
The switch housing shall be weather proof and oil resistant. The cover shall incorporate tamper resistant screws.
The unit shall be UL and CSFM Listed, FM and LPC Approved, and NYMEA Accepted.
TYPICAL ELECTRICAL CONNECTIONS
ORDERING INFORMATION
Model Description Stock
No.
PS10-1A Pressure switch with one set SPDT contacts 1340101
PS10-2A Pressure switch with two sets SPDT contacts 1340102
Hex Key 5250062
Cover Tamper Switch Kit 0090134
BVS 1/2" Ball Valve with tamper switch 1010150
PRESSURE SWITCH
TERMINATION
APPLICATION WARNING!
Due to the possibility of unintended discharges caused by pressure surges, trapped air, or short retard times,
waterflow switches that are monitoring wet pipe sprinkler systems should not be used as the sole initiating
device to discharge AFFF, deluge, or chemical suppression systems.