Murphy PSB Owner's Manual

Direct Mount Pressure Switch
Description
The PSB switch is a direct mount switch for
critical pressure points. It has one limit
contact that can be used to activate an alarm,
actuate indicator lights or shutdown
equipment.
The construction of this instrument is the
same as our time-proven Swichgage
instrument. A precision machined brass
mounting plate and port captures a high
quality stamped beryllium
diaphragm. The single-pole, double-throw
(SPDT) snap-switch is operated directly
from the diaphragm for quick acting and
positive switching. Trip point is factory
preset according to your specifications.
Housing is weather sealed to prevent entry of
moisture, dust, etc. A glass-filled nylon
terminal block with quick screw terminal
connections gives the PSB switch a real
advantage in industrial engine applications.
The PSB is ideal when reading is not desired,
but pressure is critical to operational
efficiency.
Intended for use in general purpose non-
classified areas.
**Products covered by this bulletin comply with EMC Council directive 89/336/EEC
regarding electromagnetic compatibility except as noted.
**
Applications
• Engine Lubrication
• Compressors
• Irrigation systems
• Construction Equipment
• Mobile Equipment
• Marine engines
®
Features
• Fits all engine applications
copper • SPDT snap-switch
• Activates indicator lights, alarms, or shut
down equipment
• Time-proven SWICHGAGE
• Easy wiring terminal block
• Steel housing specially coated to resist
corrosion
• Factory preset to your specifications

Specifications

Housing: Plated steel.
Pressure Connection: 1/8-27 NPT, Brass.
Diaphragm: Formed beryllium copper (heat
treated).
Pulsation Dampener: Brass (it is removable
for cleaning).
PSB-9104B page 1 of 2
Model PSB
■
Limit Switch for Critical Pressure
■
Operate Alarms or
Shutdown Equipment
■
SPDT Snap-Acting Switch
■
Fits Most Engine Applications
• Water pumps
• Oil field systems
• Generators
® construction
Catalog Section 05
Terminal Block: Three #4-40 screws.
Accuracy: Trip point: ±3% of full scale.
Switch reset differential: ±7% of full scale.
Repeatability: ±1% of full scale.
Contact Rating: SPDT 3 A @ 30 VDC
inductive.
Maximum Pressure: See Trip Point Chart
on reverse side.
Temperature Range:
Ambient= -40°F (-40°C) thru 150°F (66°C).
Process= -40°F (-40°C) thru 250°F (121°C).
Factory Trip Point Setting: See Trip Point
Chart (on back).
Pressure Range: Specify from 0-400 psi (0-
2.76 MPa) [0- 27.58 bar]. See Trip Point
Chart on reverse side.
Contact: Operates on rising or falling
pressure (specify).
Shipping Weight: 8 oz. (0.25 kgs).
Shipping Dimensions: 3 x 2-3/4 x 2-3/4 in.
(76 x 70 x 70 mm).
NOTE: No customer replacement parts.
PSB-9104B
Revised 03-06
(00-02-0031)