Measuring Compound Profiles; Measuring An Un-Parallel Surface; Influence Of Material's Temperature; Material With Large Attenuation - Reed R7900 Manuel D'utilisation

Measuring Compound Profiles

When the material to be measured has a compound profile (such as bend
of a pipe), one can use the procedures to measure cylindrical surfaces.
The exception is that one should have two analyses and get two results
when the probe's crosstalk interlayer plate is being both parallel and
perpendicular to the axial line of the object. Take the minimum readout as
the material thickness.

Measuring an Un-Parallel Surface

To get a satisfactory ultrasonic response the other surface of the object
must be parallel to or co-axial with the surface to be measured, otherwise
it will cause a measuring error or even provide no display.

Influence of Material's Temperature

Both the thickness and transmitting speed of ultrasonic wave are
influenced by temperature. If there is a high requirement of measuring
accuracy, one can use comparison method by:
• Use a test piece of the same material being measured, under
same temperature
• Obtain the temperature compensation coefficient
• Use this coefficient to correct the actual measurement of the
object

Material with Large Attenuation

Material with porous and coarse particles (such as fibre) will cause a large
scatter and energy attenuation in the ultrasonic wave. This will cause
abnormal readouts or provide no display (generally, the abnormal readout
are less than the actual thickness). These type of materials cannot be
measured by this meter.
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