Murphy Switch 45PE Series User Manual

®
45PE-96002B  
Revised 12-00  
Catalog Section 05  
(00-02-0771)  
4-1/2 in. (114 mm) Dial Pressure SWICHGAGE  
With Built-In, Snap-Acting SPDT Switches  
FWMurphy  
45PE Series  
Combination Indicating Gage and Critical  
Pressure SPDT Snap-Acting Switches  
High and Low Pressure Trip Point Indicators  
Are Visible and Field-Adjustable  
Certified  
(Selected Models)  
45PEF  
Shown  
Panel and Surface Mount Versions  
*
*
Products covered by this bulletin comply with EMC Council directive  
89/336/EEC regarding electromagnetic compatibility except as noted.  
Gage Accuracy: ±2% for first and last quarters of  
scale; the middle half is ±1%.  
Pressure Relief Disc: Located in rear of case  
(except explosion-proof models).  
Description  
Dimensions  
The 4-1/2 in. (114 mm) dial size SWICHGAGE® is  
a mechanical gage for pressure indication. It  
includes 2 adjustable SPDT switches. These snap-  
acting switches can be used for start and stop, to trip  
alarms and to shut down equipment.  
Surface Mount Models  
8-7/16 in.  
(214 mm)  
3-3/8 in.  
(86 mm)  
Snap-Acting Switches:  
2-SPDT; 2 A @ 250 VAC.  
1/2 NPT  
conduit  
Ranges are available from 30vac (-100 kPa) [-1 bar]  
thru 20,000 psi (138 MPa) [1379 bar].  
Dry Relay Contact (“BP” Models):  
10 A @ 28 VDC or 10 A @ 120 VAC.  
Wire Connections:  
Surface mount: 1/2 NPT conduit/ terminal block.  
Panel mount: Wire leads, 18 AWG (1.0 mm2) x  
9 in. (229 mm) long.  
Basic Operation  
This highly reliable gage features a bourdon tube  
sensing mechanism. Pressure against the bourdon  
tube translates into a mechanical gage reading.  
The gage pointer acts as a pressure indicator. The  
pointer movement is stopped when it meets the trip  
point indicator. The bourdon tube continues to travel  
slightly and the snap-switch trips.  
“OS” models: 1/2 NPT conduit and wire leads,  
18 AWG (1.0 mm2) x 9 in. (229 mm) long.  
Item Weight: 5 lbs 6 oz (2.4 kg) approximately.  
Explosion-proof models: 21 lb. (9.5 kg) approx.  
Panel Mount Models  
2-57/64 in.  
(73 mm)  
5-7/16 in.  
(138 mm)  
Item Dimensions: 10 x 9 x 6 in. (254 x 229  
x 152 mm) approximately.  
Explosion-proof models: 12 x 12 x 9 in  
(305 x 305 x 229 mm) approximately.  
Applications  
Murphy 45PE Series models are widely used in elec-  
tric motor applications due to their 250 VAC pilot  
duty rating. These models can also be used to moni-  
tor gas compressor pressure, pumping applications  
and industrial process applications.  
6-3/4 in.  
(171 mm)  
Basic Models  
45PE Series SWICHGAGE®  
Surface mount (square case) version.  
††  
45PEF Series SWICHGAGE®  
Specifications  
Dial: White on black, dual scale, psi and kPa  
Panel mount (round case) version.  
45PEE and 45PEBPE models feature square case  
but altered to fit round panel mounting.  
Optional back connection.  
standard, 4-1/2 in. (114 mm) diameter.  
Case: Die cast aluminum, surface or panel mount.  
Overrange: Do not exceed 10% above full range.  
Process Connection: 1/4 NPT thru 1000 psi; 1/2 NPT  
45PEBP Latching Control Relay Series  
These SWICHGAGE® models feature a latching  
control relay for automatic ON/OFF control. The  
45PEBP are designed to start and stop electric  
motor driven equipment.  
††  
Warranty  
1500 - 20,000 psi. Back connection is optional.  
A two-year limited warranty on materials and work-  
manship is given with this Murphy product. Details are  
available on request and are packed with each unit.  
NOTE: 45PEBP series models are NOT certified  
by CSA or covered by the CE mark.  
Sensing Element: Select from bronze or 316 stainless  
steel bourdon tube.  
 

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