Dunham & Morrow, Inc manufacturers of Quality Magnetic Locators for Surveyors, Hydrologists, Construction Contractors, EOD personnel, Well Drillers and any other professional desiring to pinpoint buried ferrous metal targets

Putting Your Magnetic Locator to Work

Regardless if the unit you chose, you'll find a multitude of uses for your Dunham & Morrow Locator. Here are just a few of the potential applications.

Corner Markers
Curb & Valve Boxes
Enclosures
Gas Lines
Hazmat Drums
Mag & PK Nails
Manhole Covers
Marker Magnets
Septic Tanks
Underwater Recovery
Unexploded Ordnance (UXO)
Weapons
Well Casings
and, more...

Target	Depth
Iron Marker (3/4” x 18”)	8 - 11 feet
Cast-Iron Pipe (4” Pipe)	6 - 9 feet
Manhole Cover	5 - 7 feet
Well Casing	12 - 16 feet
PK Nail (1½”)	10 - 13 inches
Iron Valve	6 - 9 feet
55 Gallon drum	7 - 10 feet
Septic Tank (Handles)	6 - 9 feet

The depths outlined here are typical responses. There have, however, been numerous instances where targets have been located at far greater depths. In almost every case, the magnetic locator operator used his instrument almost daily and knew how to get the maximum out of his instrument. He was magnetically clean, his search area was well defined and contained a minimum amount of trash metal, he held his instrument in a vertical position and he used the maximum sensitivity setting.

	The success of locating a buried object depends on your familiarity with the magnetic signature of various targets and the corresponding response of the locator's audio signal.
Locator's audio signal responds to the magnetic signature of a survey marker.

As the locator is moved over the target, the waveform depicts the increase in the frequency of the locator's 20 Hz audio idling signal. The highest frequency occurs when the locator is directly over a vertical target, and over both ends of a horizontal target
	The audio signal peaks over identical magnetic signatures at two joints of a cast-iron water line.

Locating a survey marker in close proximity to a steel fence is no problem with the
DML2000-XR.

Manhole covers normally appear as short horizontal dipoles with the peak signal level occurring at the perimeter of the manhole cover.

When searching for a Concrete Septic Tank, you can expect an increase in the audio output signal as you approach the tank with the strongest signal occurring directly over the two handles on the cover.

Frequency peaking occurs directly over service connections and valve boxes.

Be sure to visit our Tips & Tricks page for additional information.