Murphy AT03069 User Manual

AT-04052B page 1 of 2

■

Automatically adjusts engine speed
to meet demands of pressure, level,
load and temperature.

■

Speed changes made slowly and smoothly.

■

Saves fuel, engine wear, horsepower
and labor.

■

Perfect for warm-up and cool-down on auto­mated systems.

■

One model for both 12 and 24 VDC systems.

Description

The AT03069 is a completely reliable heavy
duty device developed specifically to auto­matically control engine speed to meet sys­tem demand. Low current, high torque, solid
state switching and electronic clutch make it
ideal for all automatic and semiautomatic
engine systems. Used with the appropriate
Murphy SWICHGAGE

®

, near constant
pressure, level and load can be maintained.
Check with our engineers for help with
other applications where speed control can
improve your system.

Applications

Pressure

•

City Water Systems.

•

Water Flood Injection.

•

Sprinkler Lateral Changes.

•

Make-up if a “Gang Pump” stops.

•

Multiple Hose-reel Irrigation Systems.

Level

•

Water or oil storage tanks.

•

Waterflood tanks.

•

Sewer disposal systems.

•

Flood control catch basins.

Temperature

•

Multi-engine cooling systems.

•

Air conditioned chilled water systems.

Engine load

Empty or fill reservoirs with a lower
horsepower engine—fast when head is
high—slow when head is low.

Specifications

Voltage: 11-28 VDC negative ground.
Maximum Current: 500 mA (1/2 amp).
Standby Current: Approx. 7 mA.
Increase and Decrease: Inputs float at

approx. 8.4 VDC. Grounding inputs causes
8-18 mA of current to flow from either.

Torque: 25 inch pounds.
Sealed limit switches: Factory adjusted,

controls maximum travel.

Linkage adjustment on lever arm—5 holes:

Adjusts travel: 1-3/16 in. (30 mm); 1-11/16
in. (43 mm); 2 in. (51 mm); 2-1/4 in. (57
mm) approximately.

Travel Time: 11 to 20 seconds depending on

the voltage and force applied.

Dimensions: See reverse side.
Net Weight: 5 lb. (2.27 kg)

Features

The AT03069 can enhance features of our
SELECTRONIC

®

Micro-Controller units

by allowing features such as:

•

Warm-up RPM Set point.

•

Minimum RPM Set point.

•

Maximum RPM Set point.

•

Preset Operating RPM Set point.

•

Auto Throttling To Match Flows

(as needed in flood control applications).

•

Maintaining System Pressure (as needed

in booster station application).

•

Adjustable Rate Of Change In RPM

(allowing fine tuning of overall system).

For more information, recommendations
and quotations contact our engineering dept.

Warranty

A limited warranty on materials and workmanship
is given with this FW Murphy product. A copy of
the warranty may be viewed or printed by going to
www.fwmurphy.com/support/warranty.htm

Model AT03069

AT-04052B

Revised 04-04

Replaces AT-98113B

Catalog Section 40

(00-02-0567)

MURPHYMATIC®Engine
Throttle Controller

AT-04052B page 2 of 2

Operation

A Murphy SWICHGAGE®* constantly monitors
pressure, level, temperature or load. Adjustable high
and low contacts on SWICHGAGE®are set slightly
above and below desired operating point. When
demand changes, pointer touches appropriate high
or low contact and signals speed change.
AT03069 controller responds only so long as con­tact is made. The controller stops immediately when
contacts separate. Slow, smooth action prevents
“hunting” or “surging” on normal applications.

*Mercury tube or snap-action switches are not suitable for this

type control. For more information, recommendations and
quotations contact our engineering dept.

How to Order

AT03069

Dimensions Typical Wiring

CONTROL SYSTEMS & SERVICES DIVISION

P.O. Box 1819; Rosenberg, Texas 77471; USA
[phone] fax [phone]

e-mail [e-mail]

MURPHY DE MEXICO, S.A. DE C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
[phone] fax [phone]
Villahermosa Office [phone]
e-mail [e-mail]
www.murphymex.com.mx

FRANK W. MURPHY, LTD.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
[phone] fax [phone]
e-mail [e-mail]
www.fwmurphy.co.uk

MURPHY SWITCH OF CALIFORNIA

41343 12th Street West
Palmdale, California 93551-1442; USA
[phone] fax [phone]
e-mail [e-mail]
www.murphyswitch.com

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.

MACQUARRIE CORPORATION

1620 Hume Highway
Campbellfield, Vic 3061; Australia
[phone] fax [phone]

e-mail [e-mail]

FW Murphy

P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone]

fax [phone]
e-mail [e-mail]

www.fwmurphy.com

R

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G

I

S

T

E

R

E

D

USA–ISO 9001:2000 FM 28221

UK–ISO 9001:2000 FM 29422

Printed in U.S.A.

3-3/4 in.
(95 mm)

6-3/4 in.

(171 mm)

5-1/8 in.

(130 mm)

5-7/8 in.

(149 mm)

15 in.

(381 mm)

12-1/4 in.
(311 mm)

3-5/8 in.
(92 mm)

5-1/2 in.

(140 mm)

4-3/4 in.

(121 mm)

7/8 in.

(22 mm)

SWICHGAGE

1

AT03069

Battery

®

2 3

4