Product Manual

28
29
Current Measurement in Parallel
Lines
If two lines are within 2-4 feet of each other
and parallel to each other for at least 50 feet
or more, the primary line may induce a signal
in the secondary line, particularly at higher
frequencies (27 kHz).
The secondary line always has lower current
ow than the primary line, which should be
energized by the Direct Mode at the Transmit-
ter to minimize “jumping.”
1. Locate both lines exactly with the PL-2000
Receiver and press the Depth key with the
Receiver directly over each line. Note the
Current Measurement for each line.
2. The line with the larger Current Measure-
ment value (0-100) is the primary line
attached to the positive (red) Direct
Connection cable from the Transmitter.
3. The ground stake should be moved as far
away from the secondary line as possible.
If the ground stake crosses over the sec-
ondary line, both lines may have the same
(or similar) Current Measurements.
030
010
080
Figure 1.
2m
AB
A
B
B
A
Figure 2.
Transmitter.
27kHz SENS.30
inch
27kHz SENS.30
inch
Direct Connection Mode.
Ground Stake.
Current
Measure
of the pipe (1).
Current Measure of the pipe (2).
Pipe (1)
Pipe (2)
APPLICATIONSOPERATION IN THE FIELD
How to Locate Parallel Pipes
by Inductive Mode.
NOTE: When parallel pipelines are de-
tected, the Direct Mode should be
utilized when possible.
As shown in the above Figure 1, the Maxi-
mum Bar Graph and Maximum Numerical
Value are continued between the points (A)
and (B). In this case, the two pipelines (A) and
(B) must be located separately.
1. Set up the Transmitter at the outside of
the pipeline (A) keeping the distance of 2
meters or so to the pipeline (A) as shown
by the above gure.
2. Move the Receiver from the outside of the
pipeline (A) toward the pipeline (B). The
Bar Graph and the Numerical Vale will be
changed as in the above example. The
point of the Maximum Bar Graph and the
Maximum Numerical Value of 080 is the
location of the pipeline (A).
3. When the pipeline (B) is located, move the
Transmitter to the outside of the pipeline (B).
NOTE: In cases where there are more than
two parallel pipelines in a short
interval, the Inductive Mode can
locate only the two pipelines on the
outsides.