MFG. #5400933 - REV D
1/08
PRINTED IN USA PAGE 2 OF 3
MODEL PS120
PRESSURE SWITCH
Typical Sprinkler Applications
Switch Clamping Plate TerminalDimensions
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
VA LV E
BVL
WET SYSTEM
ALARM CHECK
VA LV E
PS10
WATERFLOW
ALARM
SWITCH
WATER
MOTOR
GONG
RBVS
RBVS
CHECK
VA LV E
EXCESS
PRESSURE
PUMP
OS & Y
VA LV E
WAT ER
BY-PASS
TEST VALVE
RBVS
DWG #926-1A
Typical Connections
COM 1
2
EOLR
TO FIRE
ALARM
PANEL
TO FIRE
ALARM
PANEL
EOLR
COM
12
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.
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