MFG. #5400933 - REV D
1/08
PRINTED IN USA
PAGE 2 OF 3
MODEL PS120
PRESSURE SWITCH
Typical Sprinkler Applications
Switch Clamping Plate Terminal
Dimensions
OUTGOING
INCOMING
DWG# 923-3
Closing of any shutoff valves between the alarm check valve and
the PS10 will render the PS10 inoperative. To comply with NFPA-
72 any such valve shall be electrically supervised with a
supervisory switch such as Potter Model RBVS.
Fig. 1
Fig. 2
Fig. 3
PS120
PRESSURE
SUPERVISORY
SWITCH
BLEEDER
TEST
VALVE
BVL
WET SYSTEM
ALARM CHECK
VALVE
PS10
WATERFLOW
ALARM
SWITCH
WATER
MOTOR
GONG
RBVS
RBVS
CHECK
VALVE
EXCESS
PRESSURE
PUMP
OS & Y
VALVE
WATER
BY-PASS
TEST VALVE
RBVS
DWG #926-1A
Typical Connections
COM
1
2
EOLR
TO FIRE
ALARM
PANEL
TO FIRE
ALARM
PANEL
EOLR
COM
1
2
2
1
COM
HIGH
AIR
LOW
AIR
PS120-1
PS120-2
WITH NORMAL SYSTEM
PRESSURE APPLIED LOW -
TERMINAL 2 CLOSES ON
PRESSURE DROP.
WITH NORMAL SYSTEM
PRESSURE APPLIED
HIGH - TERMINAL
1 WILL CLOSE ON
PRESSURE INCREASE.
GROUND
SCREWS
1/2" NPT
NOTE: To prevent leakage, apply teflon tape sealant to male threads only.
ADJUSTMENT
KNOB
2.87
[72.97]
4.22
[107.19]
2.48
[62.87]
3.78
[95.89]
3.20
[81.28]
1.60
[40.64]
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.
