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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
■
Panel and Surface Mount Versions
*
Products covered by this bulletin comply with EMC Council directive
89/336/EEC regarding electromagnetic compatibility except as noted.
Description
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.
Ranges are available from 30”vac (-100 kPa) [-1 bar]
thru 20,000 psi (138 MPa) [1379 bar].
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.
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.
Specifications
Dial: White on black, dual scale, psi and kPa
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
1500 - 20,000 psi. Back connection is optional.
Sensing Element: Select from bronze or 316 stainless
steel bourdon tube.
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).
Snap-Acting Switches:
2-SPDT; 2 A @ 250 VAC.
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 mm
2
)x
9 in. (229 mm) long.
“OS” models: 1/2 NPT conduit and wire leads,
18 AWG (1.0 mm
2
) 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.
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.
Basic Models
45PE
Series SWICHGAGE
®
Surface mount (square case) version.
45PEF
Series SWICHGAGE
®
Panel mount (round case) version.
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.
NOTE: 45PEBP series models are NOT certified
by CSA or covered by the CE mark.
Dimensions
Surface Mount Models
†
45PEF
Shown
5-7/16 in.
(138 mm)
6-3/4 in.
(171 mm)
2-57/64 in.
(73 mm)
8-7/16 in.
(214 mm)
3-3/8 in.
(86 mm)
1/2 NPT
conduit
††
Panel Mount Models
†
45PEE and 45PEBPE models feature square case
but altered to fit round panel mounting.
††
Optional back connection.
Warranty
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.
*
Certified
(Selected Models)