Potter PS120 Series Manual

Ordering Information

Model Description
PS120-1 Pressure switch with one set
SPDT contacts
PS120-2 Pressure switch with two sets
SPDT contacts
Hex Key
Cover Tamper Switch Kit
BVL Bleeder valve
Service Use:
Automatic Sprinkler
One or two family dwelling
Residential Occupancy up to four stories
National Fire Alarm Code

Installation

The Potter PS120 Series Supervisory Pressure Actuated Switches are
designed primarily to detect an increase and/or decrease from normal system
pressure in automatic fire sprinkler systems. Typical applications are: Wet
pipe systems with excess pressure, pressure tanks, air supplies, and water
supplies. The PS120 switch is factory set for 120 PSI (8,3 BAR) normal
system pressure. The switch marked with the word LOW is set to operate at
a pressure decrease of 10 PSI (0,7 BAR) at 110 PSI (7,6 BAR). The switch
marked with the word HIGH is set to operate at a pressure increase of 10
PSI (0,7 BAR) at 130 PSI (9 BAR). See section heading Adjustments and
Testing if other than factory set point is required.
1. Connect the PS120 to the system side of any shutoff or check valve.
2. Apply Teflon 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 flats 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 sufficient to dislodge the knockout plug. See Fig. 9
3. Run wires through an approved conduit connector and affix the
connector to the device. A NEMA-4 rated conduit fitting is required
for outdoor use.
Potter Electric Signal Company • St. Louis, MO • Customer Service: 866-572-3005 • Tech Support: 866-956-0988 • Canada 888-882-1833 • www.pottersignal.com
PRINTED IN USA
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:
Enclosure: Cover- Die-cast with textured red powdercoat finish, single
Pressure Connection: Nylon 1/2" NPT male
Factory Adjustment:
Pressure Range: 25-175 PSI (1,7 - 12,1 BAR)
Differential: Typical 2 lbs. at 25 PSI (0,14 at 1,7 BAR)
Maximum System Pressure: 300 PSI (20,68 BAR)
Stock No.
Switch Contacts: SPDT (Form C)
1341203
1341204
Environmental Specifications:
NEMA 4/IP66 Rated Enclosure - indoor or outdoor when used
5250062
with NEMA 4 conduit fittings.
0090200 Temperature range: -40°F to 140°F (-40°C to 60°C)
1000018
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.
NFPA-13
See bulletin #5401200 PSCTSK.
NFPA-13D
NFPA-13R
NFPA-72
4. Connect the wires to the appropriate terminal connections for the
service intended. See Figures 2,4,5,6, and 8. See Fig. 7 for two switch
One Conduit Wiring.

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 PS120 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 PS120 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 PS120 Pressure Switch can be adjusted to any
point between 25 and 175 PSI (1,7 - 12,1 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 PS120-2, 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 verified with a pressure gauge.
MFG. #5400933 - REV E
09/12
PS120 SERIES
SUPERVISORY PRESSURE SWITCH
Two knockouts provided for 1/2" conduit. Individual
switch compartments and ground screw suitable for
dissimilar voltages
cover screw and rain lip.
Base- Die-cast
PS120-1 operates on decrease at 110 PSI (7,6 BAR)
PS120-2 operates in increase at 130 PSI (9 BAR) and
on decrease at 110 PSI (7,6 BAR)
8 lbs at 175 PSI (55 at 12,1 BAR)
10.1 Amps at 125/250VAC, 2.0 Amps at 30VDC
One SPDT in PS120-1, Two SPDT in PS120-2
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