DeFelsko PosiTector UTG v.3.1 Full Manual - Manual (Page 39)

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Application Notes Application Notes
Measuring on pipes (UTG C probes)
When measuring the thickness of pipe walls, the proper placement
of the transducer is important. On pipe diameters larger than 10cm
(4 inches), it is recommended to place the probe parallel to the
long axis of the pipe. For smaller diameter pipes, it is
recommended that two measurements be taken, one with the
probe perpendicular, and another with the probe parallel to the
long axis of the pipe. The smaller of the two measurements should
be recorded as the thickness for that area.
Parallel - Better when measuring pipes with a diameter greater than
10cm (4 inches).
Perpendicular - Typically better when measuring small diameter pipes.
Measuring on rough surfaces
To optimize measurement results, the surface should first be
cleaned of any foreign debris including rust and scale. Depending
on the amount of contamination/ roughness, abrasion with a wire
brush or grinding tool may be necessary.
On rough surfaces, the use of a generous amount of couplant
minimizes the surface effects and serves to protect wear on the
transducer, particularly when dragging across the surface is
involved.
During scanning operations, the probe can be become physically
decoupled, that is physically separated, from the material, either
due to the rough and/or scaly surface of the material or due to user
operation. Avoid this by using the Smart Couple
TM feature
(pg. 17).