MFG. #5401161 - REV d
09/12
PRINTEd IN USA
PAGE 1 OF 8
MODEL PS40 (VdS)
SUPERVISORY PRESSURE SWITCH
Models:
PS40-1 VdS
PS40-2 VdS
Installation
The Potter PS40 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: Dry pipe
systems, pre-action air/nitrogen supervision, pressure tanks, air supplies,
and water supplies. The PS40 switch is factory set for 2,8 BAR (40 PSI)
normal system pressure. The switch marked with the word LOW is set to
operate at a pressure decrease of ,7 BAR (10 PSI) at 2,1 BAR (30 PSI). The
switch marked with the word HIGH is set to operate at a pressure increase
of ,7 BAR (10 PSI) at 3,5 BAR (50 PSI). 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 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.
4. Connect the wires to the appropriate terminal connections for the
service intended. See Figures 2,4,5,6, and 8
UL, cUL, and CSFM Listed, FM and LPC Approved, NYMEA
Accepted, CE Marked, VdS
Dimensions:
(9,6cm) 3.78" W x (8,1cm) 3.20" D x (10,7cm) 4.22" H
Enclosure:
Cover- Die-cast with textured red powdercoat finish, single
cover screw and rain lip.
Base- die-cast
Pressure Connection:
Nylon 1/2" NPT male
Potter Electric Signal Company
• St. Louis, MO • Customer Service: 866-572-3005 • Tech Support: 866-956-0988 •
Canada 888-882-1833
•
www.pottersignal.com
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.
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 Specifications:
NEMA 4/IP66 Rated Enclosure - indoor or outdoor when used
with NEMA 4 conduit fittings.
Temperature range: -40°C to 60°C (-40°F - 140°F)
Pressure Range:
0,7 - 4,1 BAR (10-60 PSI)
Differential:
Typical 0,07 at 0,7 BAR (1 lb. at 10 PSI)
0,28 at 4,1 BAR (4 lbs. at 60 PSI)
Maximum System Pressure:
17,2 BAR (250 PSI)
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
Factory Adjustment:
PS40-1 operates on decrease at 2,1 BAR (30 PSI)
PS40-2 operates in increase at 3,5 BAR (50 PSI) and
on decrease at 2,1 BAR (30 PSI)
Conduit Entrance:
Two knockouts provided for 1/2" conduit. Individual
switch compartments and ground screw suitable for
dissimilar voltages.
Tamper:
Adjustment And Testing
The operation of the supervisory pressure 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 0,7 - 4,11 BAR (10 and 60 PSI) 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 verified with a pressure gauge.
