Murphy 45HE Series - Manual

4

-1/2 in.

(

114 mm

) Dial Size Hall Effect SWICHGAGE

®

45HE Series

■

Proven Hall Effect Switch Technology for
Pressure, Temperature and Level Applications

■

Easy-to-Adjust Alarm or Shutdown Set Points

■

Normally Open or Normally Closed Systems

■

Superior Switching Accuracy and Flexibility

■

Ideal for DC Powered Solid State Controllers

■

Tough Die Casted Aluminum Housing

■

Explosion-Proof Case Available

Description

The 45HE Series SWICHGAGE

®

is a monitoring

and alarm/shutdown device for industrial require-
ments. It combines state-of-the-art Hall effect
switching and analog indication for Pressure,
Temperature or Level applications depending on
the model used.
The 45HE is ideal for use with DC powered solid
s t a t e c o n t r o l l e r s b e c a u s e i t o p e r a t e s w i t h
Normally Open or Normally Closed Systems
from 4.5 to 28 VDC. 120 VAC On-Off control
available in Latching Control Relay (BP) models.
Most 45HE models are available in surface mount
or panel mount case designs. Dials are dual scale,
single scale, and custom dials are also available.

Basic Operation

Based on our proven OPL, SPL and OPLH Series
SWICHGAGE

®

models, the 45HE Series includes

two magnetic-field-actuated PowerHall* transis-
tors. When the magnetized indicating pointer
m e e t s o n e o f t h e
Hall effect devices,
the corresponding
alarm or shutdown
t r a n s i s t o r output
signal becomes
active. The 45HE
trip points are fin-
gertip adjustable.

Applications

The 45HE Series SWICHGAGE

®

models accurate-

ly and reliably measure, indicate and control pres-
sure, temperature and level in applications such as
gas compressor control panels, pumping applica-
tions, industrial process applications.
45HE models are available for specific applications
such as monitoring oil well lead lines, storage tank
levels, automatic ON/OFF pump control, etc.

Features

PLC and Solid State Compatible

The Normally Open and Normally Closed ver-
sions of the 45HE Series are suitable for Murphy
(and others) solid state TATTLETALE

®

annunci-

ators and logic controllers, PLC’s and micro-
processor-based controllers.

Low Switch Start-Up Override

A standard toggle switch is provided (N.O. and N.C.
surface mounted models) to override the low switch
during equipment start-up.

Latching Control Relay (BP Model)

The 45HEBP Series includes a latching control
relay for automatic ON/OFF control, either direct-
ly or through a motor starter.

Freeze-proof Sensing (FP Model)

A freeze-proof sensing device is available for the
45LHE Series level SWICHGAGE

®

. The freeze-

proof device inserts directly into the tank wall.
The 45LHEFP sensor is stainless steel with a
Buna-N rolling diaphragm.

Optional Features

Remote Transmitter Option (-P4)

This factory-sealed, remote pressure transmitter
protects the 45PHE sensing element from line pres-
sures of highly viscous and mildly corrosive fluids.
A 5 foot (1.5 m) stainless steel capillary tube trans-
mits pressure from the diaphragm seal to the unit.
A 1 NPTM plated steel pulsation dampener is
included to help prevent damaging pulsation.

Direct Transmitter Option (-P6)

The -P6 option is the direct mounted version of the
-P4 (remote transmitter option). This factory-
sealed mechanism consists of a 2 NPTM plated
s t e e l d i a p h r a g m h o u s i n g ( 3 0 4 s t a i n l e s s s t e e l
diaphragm housing is optional), which attaches
directly to the 45PHE pressure SWICHGAGE

®

.

Explosion-proof Option (-EX)

Most 45HE Series SWICHGAGE

®

devices are

available with an explosion-proof case for haz-
ardous applications.

Warranty

A two-year limited warranty on materials and
workmanship is given with this Murphy product.
Details are available on request and are packed
with each unit.

* Allegro MicroSystems, Inc., registered trademark.

15

20

140

160

120

10

80

60

100

Fingertip
Adjustable
Trip Point

PowerHall*
Transistor

Magnetized
Indicating
Pointer

45HE-95116B

Revised 12-96

Catalog Section 05/10/15

(00-02-0221)

®

FRANK W.

MFR.