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•Mark the first Pole location found with a red triangular Pole marker. After centering on the Pole, a
•When the locator gets close to a Pole, a zoom ring will appear centered on the Pole, allowing precision centering.
•The second Pole will be a similar distance from the Sonde location in the opposite direction. Locate it in the same manner and mark it with a red triangular marker.
•If the Sonde is level, the three markers should be aligned and the red Pole markers should be similar distances from the yellow Sonde marker. If they are not, a tilted Sonde may be indicated. (See “Tilted Sondes”, below.) It is generally true that the Sonde will be on the line between the two Poles, unless there is extreme distortion present.
Step 3: Verify the locate
•It is important to verify the Sonde’s location by crosschecking the receiver’s information and maximizing Signal Strength. Move the
•Notice that the poles and the point of highest Signal Strength lie on a straight line.
Important!
Being on the Equator does not mean one is over the Sonde. Seeing two Poles aligned on the display is not a substitute for centering over each Pole separately and marking their locations as described above.
For best accuracy, the
It doesn’t matter whether you locate the Poles first, or the Equator first, and then the Poles, or one Pole, then the Equator, and then the other Pole. You can even locate the Sonde using just the Signal Strength, and then verify your result with the Poles and Equator. What is important is that you verify all the data points, and mark the Sonde’s position where the signal is highest
Tilted Sondes
If the Sonde is tilted, one Pole will move closer to the Sonde and the other farther away so that the Sonde location no longer lies midway between the two Poles. The Signal Strength of the nearer Pole becomes much higher than that of the more distant Pole if the Sonde is vertical (as it could be if it fell into a break in the line); however, it can still be located.
If the Sonde is vertical what is seen on the screen is a single Pole at the point of maximum Signal Strength. (The Ridgid Floating Sonde is designed to have a single Pole “visible” and is weighted to maintain the Sonde on a vertical axis. See Note below.)
It is important to realize that a severely tilted Sonde can cause the Pole locations and the Equator to appear offset because of the angle of the Sonde; but maximizing the Signal Strength will still guide to the best location for the Sonde.
Figure 36: Sonde Locate: Equator
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•Notice that the Measured Depth reading at the maximum Signal Strength location is reasonable and consistent. If it seems far too deep or too shallow, recheck that there is an actual maximum Signal Strength at that location.
Floating Sondes
Some Sondes are designed to be flushed or to drift down a pipe pushed by water flow. Because these Sondes swing much more freely than a torpedo- shaped Sonde in a pipe, they can be oriented any which way. This means the Equator may be distorted by tilting, and the location of the Poles may vary. The only guarantee of having located a floating Sonde is maximizing the Signal Strength and
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