Influence Of Metal Surface Oxidation; Abnormal Readout Of Thickness; Utilization And Selection Of A Coupling Agent; Yellow - 0/27/100/0 - REED R7900 Manuel D'utilisation

Influence of Metal Surface Oxidation

Some metals can produce a dense oxidation layer on the surface, such
as aluminum. Even though the layer is in close contact with the substrate
and provides no obvious interface, the ultrasonic wave will have different
transmitting speeds in these two materials which will cause an error. In
addition, different thickness in oxidation layers will cause different errors.
One can make a reference piece from a batch of objects by measuring
with a micrometer or calliper, and using it to calibrate the instrument.

Abnormal Readout of Thickness

The operator should be able to identify an abnormal readout. Generally
the rust, corrosion, pit, and internal defect of the object will cause
abnormal readouts.

Utilization and Selection of a Coupling Agent

Coupling agent is for transmitting high-frequency energy between the
probe and the object. If the type of agent is wrong, or the utilization is
wrong, it will cause an error. The coupling agent should be used in a
proper amount and be coated evenly. When measuring a smooth surface
use an agent with low viscosity (such as the coupling agent provided
or light engine oil). When measuring a coarse object surface, or vertical
surface and top surface, use an agent with high viscosity (such as glycerin
grease, consistent grease, and lubricating grease, etc.).
534 Blue
123 Yellow
485 Red
123 Yellow
534 Blue
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