Summary of Contents for Dunham & Morrow DML2000
- Page 1 DUNHAM & MORROW By Schonstedt Instrument Company Tel: 304-724-4790 Fax: 304-724-4725 dml@schonstedt.com www.magneticlocator.com 1 ...
- Page 2 Always remember that the DML2000-XRM and DML2000-XR are precision instruments and should be treated accordingly. The DML2000-XRM is identical to the DML2000-XR with the exception that it also includes a visual display (a full 3 ½ digital LCD panel meter) in addition to the audio output.
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Page 3: Table Of Contents
Magnetic Cleanliness ....................5 Operation ........................6 Sensitivity Setting ...................... 6 Audio Output ......................6 Pinpointing your Target ..................... 7 Panel Meter (DML2000-XRM only) ................7 Common Magnetic Signatures ..................8 General Specifications ....................14 Warranty & Service ..................... 15 Table of Figures Fig. -
Page 4: Introduction
2 to 3 hours of normal operation remaining. Typically the DML2000-XR will provide over 60 hours of operation from a set of 4-AA, alkaline batteries. Using lithium batteries can increase this to over 100 hours of operation. -
Page 5: Theory Of Operation
Theory of Operation The DML2000-XR Magnetic Locator uses fluxgate magnetometers to detect measure local magnetic field. Fluxgate magnetometers are vector magnetic field sensors that measure the average magnetic field component along their sensitive axis, i.e. the magnetic field component along the longitudinal axis of the sensor tube. -
Page 6: Operation
When no magnetic objects are present, the instrument’s audio output idles at approximately 20 Hertz. As the magnetic locator is swept back and forth in a desired search area, the speaker output tone increases in frequency when/if the DML2000-XR approaches a magnetic object. 6 ... -
Page 7: Pinpointing Your Target
“X” or crossing pattern. Panel Meter (DML2000-XRM only) The DML2000-XRM Magnetic Locator has all of the standard features of the DML2000, plus an easily readable Liquid Crystal Display (LCD) panel meter. The 3½ digit (0 to ± 1999) Digital Panel Meter provides a high resolution display, and the digital display provides an exact numeric readout with a separate polarity indicator. -
Page 8: Common Magnetic Signatures
In the figures that follow, the bold line above ground indicates the relative output frequency level of the DML2000-XR as it moves across the indicated target; the higher the line, the higher the instrument output frequency. -
Page 9: Fig. 6: Horizontal Pipe
Figure 6: Horizontal Pipe As illustrated in Figure 6, the peaking of the DML2000-XR output frequency normally indicates that you are over the end of a pipe section, which can be either a weld or a “Bell” joint. When searching for horizontal gas and water lines, look for a polarity change on the digital panel meter.** A polarity change that occurs when the output frequency is low means you are... -
Page 10: Fig. 7: Service Connections/Valve Boxes
Most concrete septic tanks have a cover with two handles. The handles are inverted, U-shaped pieces of rebar that are highly magnetic. In most cases, the audio output of the DML2000-XR will reach its peak directly over the handles, which makes it easy for the operator to identify the 10 ... -
Page 11: Fig. 9: Manhole Cover
In other cases, the DML2000-XR will also detect the magnetic field of the wire mesh or rebar in the concrete. This allows the operator to not only pinpoint the location of the cover but to also outline the tank and determine precisely its orientation. -
Page 12: General Specifications
4 - “AA” Batteries Low Battery Indicator: RED, flashing LED with 2-3 hours use remaining LCD Panel Meter: [0 to ± 1999] Digital Display (Applies to Model DML2000-XRM only) Temperature Range: -20º F to 120º F (-29º C to 50º C) Audio Output: Variable Frequency, (20 –... -
Page 13: Warranty & Service
Warranty & Service Dunham & Morrow, by Schonstedt Instrument Company, warrants each product of its manufacture to be free from defects in material and workmanship subject to the following terms and conditions. The warranty is effective for 3 years after the date of shipment by Dunham &...
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