®
AT-04052B
Revised 04-04
Replaces AT-98113B
Catalog Section 40
(00-02-0567)
MURPHYMATIC Engine
Throttle Controller
Model AT03069
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Automatically adjusts engine speed
to meet demands of pressure, level,
load and temperature.
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Speed changes made slowly and smoothly.
Saves fuel, engine wear, horsepower
and labor.
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Perfect for warm-up and cool-down on auto-
mated systems.
One model for both 12 and 24 VDC systems.
Temperature
Description
Features
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Multi-engine cooling systems.
Air conditioned chilled water systems.
The AT03069 can enhance features of our
SELECTRONIC® Micro-Controller units
by allowing features such as:
The AT03069 is a completely reliable heavy
duty device developed specifically to auto-
matically control engine speed to meet sys-
tem 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.
Engine load
Empty or fill reservoirs with a lower
horsepower engine—fast when head is
high—slow when head is low.
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Warm-up RPM Set point.
Minimum RPM Set point.
Maximum RPM Set point.
Preset Operating RPM Set point.
Specifications
Auto Throttling To Match Flows
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.
(as needed in flood control applications).
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Maintaining System Pressure (as needed
in booster station application).
Adjustable Rate Of Change In RPM
(allowing fine tuning of overall system).
Applications
Pressure
For more information, recommendations
and quotations contact our engineering dept.
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City Water Systems.
Water Flood Injection.
Sprinkler Lateral Changes.
Make-up if a “Gang Pump” stops.
Multiple Hose-reel Irrigation Systems.
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.
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
Level
Travel Time: 11 to 20 seconds depending on
the voltage and force applied.
Dimensions: See reverse side.
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Water or oil storage tanks.
Waterflood tanks.
Sewer disposal systems.
Flood control catch basins.
Net Weight: 5 lb. (2.27 kg)
AT-04052B page 1 of 2
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