MFG. #5400930 - REV D
1/08
PRINTED IN USA
PAGE 3 OF 3
MODEL PS40
PRESSURE SWITCH
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
Fig. 9
Removing Knockouts
NC
NC
NO
NO
C
C
C
1
2
C
1
2
LOW PRESSURE SWITCH
HIGH PRESSURE SWITCH
Changing Pressure
Low Pressure Signal Connection
EOLR
TO FIRE ALARM PANEL
EOLR
TO FIRE ALARM PANEL
High Pressure Signal Connection
Fig. 5
Fig. 7
(With normal system pressure)
Engineer/Architect Specifi cations Pressure Type Waterfl 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 fi re
sprinkler system as shown and or specifi 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/IP55 rating.
The pressure switch shall be UL, ULC, and CSFM listed, FM and LPC approved
and NYMEA accepted.
•Installation must be performed by qualifi 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 fl 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 Tefl 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.
For low pressure
use: Com and
Terminal 1
For waterfl ow
use: Com and
Terminal 2
