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a constant height above the ground as distance affects Signal Strength.
• Note the Signal Strength and move away from the high point in all directions. Move the
Figure 34: Dipole Field
When locating a Sonde, first set up the locate:
•Activate the Sonde before putting it in the line. Select the same Sonde frequency on the
After the Sonde has been sent into the pipe, go to the suspected Sonde location. If the direction of the pipe is unknown, push the Sonde a shorter distance into the line (~15 feet (5m) from the access is a good starting point).
Location Methods
There are three major parts to locating a Sonde. The first step is to localize the sonde. The second part is pinpointing. The third is verifying its location.
Step 1: Localize the sonde
•Hold the
•Lower the
•Maximize the Signal Strength. When it appears to be at its highest point, place the
Figure 35: Poles and Equator of a Sonde
If while “getting closer” the Equator appears on the screen, follow it in the direction of an increasing Signal Strength to localize the Sonde.
If a Pole appears before the Equator appears, localize the Sonde by centering the Pole in the
Step 2: Pinpoint the Sonde
The Poles 
should appear on either side of the maximum signal point, an equal distance on either side if the Sonde is level. If they are not visible on the screen at the point of maximum Signal Strength, move from the maximum point perpendicular to the dotted line (Equator) until one appears. Center the locator over the Pole.
Where the Poles occur depends on the Sonde’s depth. The deeper the Sonde, the further away from it the Poles will be.
The dotted line represents the Equator of the Sonde. If the Sonde is not tilted, the Equator will intersect the Sonde at maximum Signal Strength and minimum Measured Depth.
Note: being on the Equator does not mean that the locator is over the Sonde. Always verify the locate by maximizing Signal Strength and marking both Poles.
Ridge Tool Company Elyria, Ohio U.S.A | www.seektech.com | 23 |
