Dunham & Morrow DML2000-XR User Manual - Page 9

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is near or under the fence, there will be a dramatic increase in the instrument's frequency as

you approach the target, and you will have no difficulty distinguishing your target from the

fence.

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

nominally over the midpoint of the pipe section. A polarity change when the output frequency is

high typically indicates a pipe joint or weld.

** DML2000-XRM (Applies to metered units only)