PeakTech 5225 Operation Manual

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4. Precautions for accuracy
1). For very thin material
Any ultrasonic thickness gauge, when the thickness of the material to be measured is less than the
minimum limit the fault reading will occurs. Using sample block compare method to get a minimum
limit of this material.
2). For stained, rusting surface
The stained/rusting surface on the contra side will occurs the ruleless wrong readings. Sometimes a
small stained spot is hard to find out. Take care for measurement while measuring the known
rusting spot/suspicious area. Or using sound insulation celotex board to locate the spot in different
testing angles.
3). Identify different velocity with vary material
A fault reading would obtains, when measuring the hardware with the velocity calibrated by prior
material. So a correct velocity should be adopted. The fault reading may also result form the
difference between the actual velocity with the calibrated value.
4). Abrasion of the transducer
Because the transducer is made of propylene, long period use will cause the surface of transducer
became more rough which will decline the sensitivity lead to the wrong reading. Please polish the
surface with sand paper or whetstone to assure the smoothness and parallel. If the reading still
unsteady, the transducer should be replaced with new one.
5). ZERO function
ZERO(calibration) is used to calibrate the unit with the standard block on the panel, do press this
key for calibration with other materials or will the wrong measuring will take place.
6). Multilayer / composite material
It is impossible to read out the thickness of the uncoupled multilayer for the ultrasonic wave can not
go through the uncoupled space. Furthermore, the sonic wave cannot travel in the composite
material at an even speed, so ultrasonic reflect principle cannot be applied to measure the
multilayer /composite material.
7). Influence from the oxidized surface
For some metals, such as aluminum a layer of oxide being generated on their surface. The oxidized
layer combined with the substrate tightly, but the sonic wave travel within 2 different material which
will lead to error reading, the more oxidized layer the reading will be more tolerant.
Please calibrated the unit with the sample block that pick up along the hardware to be measured,
and obtain the thick of sample block by using micrometer.
8). Abnormal reading
A seasoned operator should be capable to distinguish the abnormal reading, practically result from
rusting, erosive recess surface / incorrect calibrate sample block/ the inner flaw of material.
9). Choose and using coupling agent
Coupling agent serves the high frequency ultrasonic wave transmitting between the transducer to
the hardware. Choose incorrect agent or wrong operation can cause error or poor coupling which
lead to failure of measuring. The coupling agent should be used in proper way, typically,
a single droplet of agent is sufficient.
It is important to use proper coupling agent, low viscosity agent(the provided agent / machining oil)
is suitable for smooth surface. For rough / veritcal / aluminum surface, high viscosity agent like
glycerin and lubrication grease is applicable.

PeakTech 5225 Specifications

General

Brand	PeakTech
Model	5225
Category	Measuring Instruments
Language	English