Measurement Of The Tube & Pipe - AND AD-3255 Instruction Manual

Error Due to Paint or Coating
If paint or coating on the material is very thick, the thickness of the
paint or coating may be included for the measurement.
Gap of the Transducer
There is an acoustic barrier "gap" between two hemi-circles inside of
the transducer. The ultrasonic wave is transmitted from one of the
hemi-circles, its echo is received at the other hemi-circles. Put the
material under the center of two hemi-circles.
Plug
5-3. Measurement of the Tube & Pipe
Measurement of Pipe and Tube
The direction of the transducer is important when measuring the wall
thickness of a pipe. If the diameter of the pipe is more than
approximately 10 cm, it is necessary to match the direction of the
acoustic barrier "gap" of the transducer to the perpendicular direction
"right angle" of the long axis direction. The measurement of narrow
pipes uses two direction measurements. One of the directions is
perpendicular to the long axis direction, and the other is parallel. The
thickness is the smaller of the two values.
Top
The Direction of the Acoustic
Barrier "Gap" of the Transducer
NG, The direction of "gap" is tilted.
OK, The direction of "gap" is parallel.
OK, The direction of "gap" is
perpendicular.
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Gap