Murphy Switch PSB User Manual

PSB-9104B  
Revised 03-06  
Catalog Section 05  
(00-02-0031)  
Direct Mount Pressure Switch  
Model PSB  
Limit Switch for Critical Pressure  
Operate Alarms or  
Shutdown Equipment  
SPDT Snap-Acting Switch  
Fits Most Engine Applications  
**  
Terminal Block: Three #4-40 screws.  
Description  
Applications  
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.  
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.  
Engine Lubrication Water pumps  
Compressors Oil field systems  
Irrigation systems  
Construction Equipment  
Mobile Equipment  
Marine engines Generators  
Maximum Pressure: See Trip Point Chart  
The construction of this instrument is the  
same as our time-proven Swichgage  
on reverse side.  
®
Temperature Range:  
Features  
instrument. A precision machined brass  
mounting plate and port captures a high  
quality stamped beryllium copper  
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.  
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).  
Fits all engine applications  
SPDT snap-switch  
Activates indicator lights, alarms, or shut  
down equipment  
Time-proven SWICHGAGE construction  
Easy wiring terminal block  
Steel housing specially coated to resist  
corrosion  
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).  
®
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.  
Factory preset to your specifications  
Specifications  
Housing: Plated steel.  
NOTE: No customer replacement parts.  
Pressure Connection: 1/8-27 NPT, Brass.  
Diaphragm: Formed beryllium copper (heat  
treated).  
Pulsation Dampener: Brass (it is removable  
for cleaning).  
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.  
PSB-9104B page 1 of 2  
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