Murphy 45PE Series - 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

FW

Murphy

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)