UT345A

110401111158X
2022/05/20 0
 1. Overview

This product is an intelligent ultrasonic thickness gauge

that adopts the latest high performance and low power
consumption microprocessor technology. Based on the
principle of ultrasonic measurement, it can measure the
thickness and sound speed of metal and other materials.
It can detect the thinning of pipes and pressure vessels
after corrosion, and can make accurate measurements
of plates and machined parts. The gauge can be widely
used in petroleum, chemical, metallurgy, shipbuilding,
aviation, aerospace and other fields.

1.1 Operating Principle

When measuring the thickness, the ultrasonic pulse is

generated by the probe to reach the measured body
through the coupling agent. Part of the ultrasonic signal
is reflected from the bottom of the object, and the probe
receives the reflected echo. The gauge calculates the
round trip time of the ultrasonic wave and the thickness
value according to the following formula, and then displays
the calculated results.

In the formula: H-Measured thickness; V-Material sound

velocity; t-Round trip time of ultrasonic wave in specimen

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1.2 Specifications

Display 2.4" monochrome dot matrix screen

Language English/Chinese
Measurement range 1.00~300.00mm

Sound velocity range (1000～9999) m/s

Unit 0.1mm/0.01mm/0.01in
H<10mm, ±0.1mm, H is the actual
Accuracy thickness;
H≥10mm, ±(1%H+0.1)mm
Lower limit of pipe measurement Φ20×3mm (steel)
300 groups, including material, sound
Data storage velocity, unit, measured value, MAX,
MIN and AVG of each group
Single measurement, continuous
Main functions measurement, alarm, sound velocity
measurement, auto calibration
Battery Built-in 3.7V 2000mAh lithium battery
Charging specification DC5V 1A, Type-C interface
Operating time (full battery) About 16h
Operating temperature and humidity 0℃~40℃ 10%RH~80%RH
Storage temperature and humidity -10℃~50℃ 10%RH~70%RH
Product size 140×66×28.5mm

Note: 1) Oil coupling agent cannot be used for the

standard probe, otherwise the probe will be damaged.
After using the probe, please wipe the residual coupling
agent on it to extend its service life.
2) Please avoid using the product in oily environment as
far as possible. If unavoidable, minimize the contact
time with oily substances, and wipe the probe surface
with oil-absorbing paper after use.

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2. Structure and Appearance

Product features

4 5

3 Single

20.00 mm
Mat
Steel 5920
Max mm
Min mm
Avg mm

2 ULTRASONIC THICKNESS GAUGE

Mode m/s
Menu Cal

Rec

6 7
Enter

1
Back
Alarm

1. Outer shell 2. Buttons 3. Display

4. Transmitting socket 5. Receiving socket
6. Standard thickness block
7. Probe

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2.1 Main Interface
After the gauge is turned on, it will automatically enter
the main interface, as shown below:
1 2 5 4
Scan

4.42 mm
6 Mat：
Custom� 5920
Max 4.50mm 3
Min 4.42mm
Avg 4.43mm

3. Battery Charging and Maintenance

The product is equipped with a non-removable 3.7V
2000mAh lithium battery.
When the product cannot be turned on or the battery
is empty, please charge it in time.
Charge the product with a DC5V adapter larger than
1A and the charging interface is Type-C.
When charging, the battery icon scrolls . When fully
charged, the battery icon becomes full .
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Note: When not in use for a long time, the product should
be fully charged and recharged every six months to avoid
battery damage.
4. General Measurement Process

5. Preparation
5.1 Treatment of Measured Workpiece Surface
If the measured object surface is rough or seriously
rusted, please use the following methods:
●Use coupling agent on the measured object surface
●Use rust remover, wire brush or sandpaper to treat
the surface
●Multiple measurements near the same point
6. Operation
6.1 Power On/Off
Insert the probe into the gauge and short press to
power on.Long press to power off.
Auto power off: The product will shut down automatically when
there is no operation. The default time is 5 minutes.
Users can select the auto power off time, refer to 6.18 Power Off.
Force shutdown: Long press the Power button for more than 10s.
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6.2 Single Measurement
Evenly smear the coupling agent on the area to be
measured. Tightly couple the probe to the material
surface, and the thickness of the measured area will
show on the screen. When the probe is well coupled
to the material, the screen will display the coupling
symbol . If the coupling symbol flickers or there is no
coupling symbol, it indicates that the coupling condition
is bad and the coupling agent needs to be added. After
the probe is removed, the coupling symbol disappears
and the thickness value remains.
Figure 1 Add the coupling agent

Figure 2 Evenly smear the coupling agent and tightly

couple the probe to the material surface.

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6.3 Continuous Measurement
Evenly smear the coupling agent on the area to be
measured and couple the probe to the material surface.
Move the probe along the surface. The gauge will display
the current measured value, MAX, MIN and AVG in real
time.
6.4 Alarm
Users can monitor the unqualified materials with the
alarm function. Long press to turn on/off the alarm.
If is displayed on the screen, the alarm is turned on.
If is displayed on the screen, the alarm is turned off.
For example:
Standard value: 4.00mm, limit: ±0.1mm. When the
measured thickness is less than 3.90mm or greater than
4.10mm, the gauge will give an alarm sound, indicating
that the thickness is not qualified. Users can press any
button to exit the alarm, or continue measuring.

6.5 Calibration
Note: Calibration should be carried out when the probe
is replaced, the ambient temperature changes greatly
or the measurement deviation occurs.

Calibrate the gauge if it is used for the first time or not

used for a long time. Calibration must be done using the
standard thickness block. After calibration, the material
automatically changes to steel, and the sound velocity
changes to 5920m/s (0.233in/us).

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Calibration steps:
1) Long press to enter the calibration mode.
"Please Calibrate" will show on the screen.
2) Refer to Figure 1 and Figure 2 in 6.2 Single
Measurement to evenly smear the coupling agent
on the surface of the standard thickness block. Press
the probe on the coupling agent to make it tightly contact
with the block surface. (Note: the coupling agent should
not be too thick. Otherwise the gauge will count the
thickness of the coupling agent, resulting in calibration
errors).
3) Press to save the calibration data. (Note: Before
pressing , the value displayed might not be 4mm.
When the value is stable, press . After calibration, the
displayed value should be within the range of 4±0.04mm,
otherwise recalibrate).
6.6 Sound Velocity Measurement
Different materials have different sound velocities. The
materials and velocities listed in Appendix A are for r
eference only.This function is used to measure the sound
velocities of materials. The steps are as follows:
1) First calibrate the gauge.

2) Use a caliper to measure the thickness of the

workpiece.
3) Use the gauge to measure the thickness of the
workpiece.

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4) Press or to make the thickness measured by
the gauge the same as the value measured by the caliper.

5) Press to calculate the workpiece sound velocity.

6) At this point, the correct sound velocity can be obtained,
and the correct thickness can be obtained by measuring
the same material with the sound velocity.

Note: The thickness adjustment range is ±20mm

(±0.79in) (for customized materials, ±250mm (±9.84in)).
The upper limit is 300mm, and the lower limit is 1mm.
In case of misoperation, users can refer to 6.7 Sound
Velocity Selection.

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6.7 Sound Velocity Selection
Users can select the sound velocity according to the
material. When the current unit is mm, the unit of
sound velocity is m/s. When the unit is in, the unit of
sound velocity is in/us. In the main interface,
short press to select the material. The gauge has
three types of custom materials. If users do not know
which material to select, they can select the custom
materials and then measure the sound velocity of the
material, refer to 6.6 Sound Velocity Measurement.
Material selection interface
MAT 1) Press to step through the
options upwards.
Steel 5920
Stainless 5740
2) Press to step through the
Brass 4399 options downwards.
Copper 4720 3) Press to confirm the selected
Iron 5930 material and enter the sound velocity
Cast iron 5110 adjustment interface.
Plumbum 2400
4) Press to return to the main
interface.
Sound velocity adjustment interface
1) Press to add the value. Long
SPD
press it to scroll up.
Adjust range 2) Press to subtract the value.
5720 - 6120
Long press it to scroll down.
3) Press to confirm the sound
5920 m/s
velocity and return to the main
interface.
4) Press to return to the
material selection interface.
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6.8 Clear Measured Results
In the single and continuous measurement interfaces,
short press to clear the current measured results
(including MAX, MIN and AVG). In the continuous
measurement mode, the results can only be cleared
after the probe is removed.
6.9 Data Storage
In the single and continuous measurement interfaces,
long press to save records. Each record includes
the current measured value, MAX, MIN, AVG and
material sound velocity. A maximum of 300 groups of
data can be stored. To view and delete records, refer
to 6.14 Records. In the continuous measurement mode,
the data can only be saved after the probe is removed to
avoid storing unstable data.

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6.10 Menu
Long press to enter the menu. The options
include Material, Speed, Unit, Records, Setting,
About and Reset.

Menu 1) Press to step through the

options upwards.
Material
2) Press to step through the
Speed
Unit options downwards.
Records 3) Press to enter the interface
Setting of the selected option.
About
Reset 4) Press to exit the menu and
return to the main interface.

6.11 Material
In the material selection interface:

MAT 1) Press to step through the

materials upwards
Custom 1
Custom 2
2) Press to step through the
Custom 3 materials downwards.
Aluminum 6370 3) Press to confirm the selected
Steel 5920 material and return to the menu.
Stainless 5740
Brass 4399 4) Press to return to the menu.

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6.12 Speed
The default value is ±200m/s (0.008in/us). The
adjustment range of custom materials is
1000m/s to 9999m/s (0.039in/us to 0.394in/us).

SPD 1) Press to add the value. Long

press it to scroll up.
2) Press to subtract the value.
Long press it to scroll down.
5920 m/s
3) Press to save and return to
the menu.
4) Press to return to the menu.

6.13 Unit
In the unit selection interface:

Unit 1) Press to step through the

units upwards.
0.1mm
2) Press to step through the
0.01mm
0.01in units downwards.
3) Press to save and return to
the menu.
4) Press to return to the menu.

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6.14 Records
In the menu, select "Records" and press to enter
the records interface. When there is no record, the
screen will display "No records", and the gauge cannot
enter the records interface.
Records 1) Press to step through the
options upwards.
first page
last page
2) Press to step through the
selected item options downwards.
Delete the item 3) Press to enter the interface
Delete all of the selected option.

4) Press to return to the menu.

6.14.1 First Page
Select "First page" and the screen will display the
records from the first page. The number and value of
each record will also be displayed.

Records
1) Press to page up.
001 4.50mm
002 4.44mm 2) Press to page down
003 4.42mm
3) Press to select a record.
4) Press to return to the
records interface.

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When a record is selected, press or to step
through the records upwards or downwards.
Short press to view the detailed information of
the selected record (NO., measured value, MAX, MIN
and AVG). Short press to return to the record list.

Records

001
4.50 mm
Mat
Custom1 5920
Max 4.50mm
Min 4.50mm
Avg 4.50mm

When viewing a record, users can long press to

delete this record. Press or to view the
previous or next record.

6.14.2 Last Page

Select "Last page" and the screen will display the
records from the last page. The number and value
of each record will also be displayed, refer to 6.14.1
First Page.

6.14.3 Selected Item

In the records interface, select "Selected item" to choose
a record to be viewed. The screen will display the record
list starting from the page where the selected record is
located. The number and value of each record will also
be displayed.

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 1) Press or to adjust the
Select group
record number.
Select group From 2) Press to confirm the adjusted
001 to 009 digit (tens digit/tens digit/ units digit).
001 After the units digit is confirmed, it
will enter the page where the
selected record is located.
3) Press to return to the records
interface.
6.14.4 Delete the Item
In the records interface, select "Delete the item" to
choose the record to be deleted.
Del Group 1) Press or to adjust the
record number.
2) Press to confirm the
group range
（001-009）
adjusted digit (tens digit/tens digit
From 001to001 /units digit). After the units
digit is confirmed, a prompt will
pop up.
3) Press to return to the
records interface.
When the prompt pops up, users can press or
to select Yes/No, and then press to delete or not.
Press to return to the previous interface.

Del

Delete
001-001
Yes No

Deleting records takes a while.

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6.14.5 Delete All
In the records interface, select "Delete all" to delete all
records. Press or to select Yes/No, and then
press to delete or not. Press to return to the
records interface.

Del
Do you confirm to
Delete all Saved
data?
Yes No

6.15 Setting
In the setting interface:
1) Press to step through the
Setting
options upwards.
Sound 2) Press to step through the
Back light
options downwards.
Power off
Alarm 3) Press to enter the interface
Language of the selected option.
4) Press to return to the menu.

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6.16 Sound
In the sound interface:

sound 1) Press or to select ON/OFF.

2) Press to save.
ON OFF
3) Press to return to the setting
interface.

6.17 Backlight
In the backlight interface:
1) Press to add the backlight
time.
Backlight
2) Press to subtract the backlight
time.
Time 180S
3) Press to confirm.

4) Press to return to the setting

interface.

6.18 Power Off

In the power off interface:

1) Press to add the power off time.

Shut
2) Press to subtract the power off
Time 300S
time.
3) Press to confirm.
4) Press to return to the setting
interface.
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6.19 Alarm
In the alarm interface, first adjust the standard value,
and then adjust the limit. Long press or to
quickly adjust the value.
1) Press to add the
Alarm standard/limit.
2) Press to subtract the
Standard 4.00mm standard/limit.
3) Press to confirm.
Limit ±0.01mm

4) Press to return to the setting

interface.
6.20 Language
In the language interface:
1) Press to step through the
Language options upwards.
Chinese 2) Press to step through the
options downwards.
English
3) Press to save.
4) Press to return to the
setting interface.

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6.21 About
Press to return to the setting interface in the about
interface.
The content will be updated later. The actual situation
prevails.
About

ID: UTG China

Version：V.202204

6.22 Reset
In the reset interface:

Reset 1) Press or to select Yes/No.

Do you need to 2) Press to confirm.
restore Factory
settings ?
Yes NO
3) Press to return to the setting
interface.

7. Measurement Applications

7.1 Measurement Modes

●Single point measurement: Use the probe to measure
any point of the measured object. The displayed value is
the thickness.

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●Two-point measurement: Use the probe to measure
the same point of the measured object twice. The probe
parting plane is 90°, and the smaller value is the
thickness.
●Multi-point measurement: Multiple measurements are
made in a circle with a diameter of about 30mm, and the
minimum value is the thickness.
●Continuous measurement: Continuously measure
along a specified route with the single point method.
The distance between each point is not less than 5mm,
and the minimum value is the thickness.
7.2 Tube Wall Measurement
The probe split surface can measure along the axis of
the pipe or the axis of the vertical pipe. If the pipe
diameter is large, the measurement should be in the
direction of the vertical axis. When the pipe diameter
is small, it should be measured in both directions,
and take the minimum value as the thickness.
8. Maintenance and Cautions
8.1 General Cautions
●The gauge and probe should be avoided from strong
vibration.
●Do not place the gauge in a damp environment.
●Do not rotate the probe when inserting or
removing it to avoid damaging the cable core.
●The attachment of oil and dust will make the probe
cable gradually aging and fracture. After use, the dirt
on the cable should be removed.

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8.2 Cautions during Measurement
●Good measurements are made only when stable
coupling symbol appears;
●When there is a large amount of coupling agent
on the object surface, it will cause mismeasurement.
Therefore, at the end of the measurement, the probe
should be quickly removed from the surface.
●The probe surface is acrylic resin and should be
gently pressed when used. When measuring rough
surface, try to reduce the probe scratching on it.
●When measuring at room temperature, the surface
of the measured object should not exceed 60℃,
otherwise the probe can no longer be used.
●If the probe wears, the indicating value will be
unstable. Please replace it.

8.3 Clean the Standard Thickness Block

The standard thickness block should avoid rust.
Wipe the block after use, and don't come into
contact with sweat. If not used for a long time,
a little grease should be coated on the surface of
the block, and the grease can be wiped after the
next use.

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8.4 Clean the Outer Shell
Alcohol and diluent have corrosive effect on the casing,
so wipe it gently with a wet cloth.

8.5 Repair
When there are problems with the gauge (such as
inability to measure, abnormal LCD display, large error
and button operation failure or confusion), please do not
disassemble or adjust any parts, and contact after-sales.

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Appendix A Material Sound Velocity
Note: The sound velocities listed are approximate
and are for reference only.
Sound velocity
Material
in/µs m/s
User define 1 0.233 5920
User define 2 0.233 5920
User define 3 0.233 5920
Aluminum 0.250 6340-6400
Steel, common 0.233 5920
Steel, stainless 0.226 5740
Brass 0.173 4399
Copper 0.186 4720
Iron 0.233 5930
Cast Iron 0.173-0.229 4400－5820
Lead 0.094 2400
Nylon 0.105 2680
Silver 0.142 3607
Gold 0.128 3251
Zinc 0.164 4170
Titanium 0.236 5990
Tin 0.117 2960
Acrylic resin 0.109 2760
Epoxy resin 0.100 2540
Ice 0.157 3988
Nickel 0.222 5639
Plexiglass 0.106 2692
Porcelain 0.230 5842
PVC 0.094 2388
Quartz glass 0.222 5639
Rubber, vulcanized 0.091 2311

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Appendix B FAQ and Solutions
B.1 Influence of Surface Conditions on Measurement
Results
B.1.1 Surface Coverings
Before measurement, remove dust, dirt, rust, paint and
other coverings on the object surface.
B.1.2 Rough Surfaces
Too rough surface can cause error, or even no reading.
The material surface should be as smooth as possible.
Grinding, polishing, filing and other methods are helpful,
and a high-viscosity coupling agent can also be used.
B.1.3 Roughwrought Surfaces
Regular grooves created by roughwrought surfaces
(such as lathes or machines) can also cause errors, as
described above. In addition, adjust the angle between
the probe partition board (through the bottom center of
the probe metal thin layer) and the measured material
groove, so that the partition board and the groove are
vertical or parallel to each other. Take the minimum
value as the thickness.
B.1.4 Cylindrical Surfaces
When measuring cylindrical materials, such as pipes,
oil drums, etc., it is very important to correctly choose
the included angle between the probe partition board
and the axis of the measured material. The probe is
coupled with the measured material, and the probe
partition board is parallel or perpendicular to the
material axis. Slowly shake the probe vertically along
the axis, and the reading on the screen will change
regularly. Take the minimum value as the thickness.
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Select the angle between the probe partition board and
the axis according to the curvature of the material. For
pipe with large diameter, the probe partition board is
perpendicular to the pipe axis. For pipe with small
diameter, the probe partition board is perpendicular or
parallel to the pipe axis. Take the minimum value as the
thickness.
B.1.5 Composite Shapes
The method described above can be used when
measuring materials with composite shapes (such
as pipe elbows). The difference is that two
measurements are made, reading the probe partition
and axis perpendicular and parallel values respectively.
Take the smaller value as the thickness.
B.1.6 Unparallel Surfaces
To obtain a stable and reliable value, the other surface
of the material must be parallel or coaxial to the
measured surface.
B.2 Influence of Temperature on Measurement
Results
The thickness and the velocity of ultrasonic wave in the
material are affected by temperature. When higher
accuracy is needed, the blocks with the same material
and approximate thickness can be measured under the
same temperature. The temperature compensation
coefficient can be obtained, and the measured value of
the workpiece can be corrected with this coefficient.

B.3 Influence of Material Attenuation on

Measurement Results

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Fiber, porous, coarse crystal materials will cause a lot of
ultrasonic scattering and energy attenuation, so that the
gauge may have abnormal reading or no reading
(abnormal reading is usually less than the actual
thickness). In this case, the material is not suitable for
measurement with this gauge.
B.4 Reference Blocks
The closer the material of the calibrated block is to the
measured material, the more accurate the measurement
will be. An ideal reference block would be a set of blocks
of different thicknesses of the measured material, which
would provide instrumental compensatory correction
factors (such as material microstructure, heat treatment
conditions, particle orientation, surface roughness, etc.).
In most cases, satisfactory measurement accuracy can
be obtained by using only one reference block. The
block shall be of the same material and of a similar
thickness as the measured material. The uniform
material can be used as a block after measuring with a
micrometer.
For thin materials, a block may be used to determine the
exact lower limit when its thickness approaches the lower
limit measured by the probe. Do not measure material
below the lower limit of thickness. If the thickness range
is estimable, the thickness of the block shall be the upper
limit. When the material to be tested is thick, especially
the alloy with a complex internal structure, one of the
blocks close to the measured material should be
selected to facilitate calibration.
The internal structure of most forgings and castings is
directional. The sound velocity will vary in different

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directions. To solve this problem, the test block should
have an internal structure in the same direction as the
measured material, and sound waves should travel in
the same direction in the test block as in the material.
In certain cases, the reference block can be replaced by
the sound velocity table of the known material. But this
is only approximating the substitution of some reference
blocks. In some cases, the values in the sound velocity
table differ from the actual measurements because of
differences in the physical and chemical conditions of
the material. This method is often used to measure mild
steel, but only as a rough measurement. This gauge has
the function of measuring the sound velocity, so it can
measure the sound velocity first, and then measure the
workpiece with the sound velocity.

B.5 Casting Measurement

The grain size of casting material is coarse and the
structure is not dense enough, which will cause
great attenuation of sound energy. In addition, the
measurement is often carried out in the state of wool,
so it is difficult to measure. The degree of attenuation
is closely related to grain size and ultrasonic
frequency. At the same frequency, the attenuation
increases with the increase of grain diameter, but
when it exceeds the highest point, the attenuation
tends to a fixed value. For probes with different
frequency, the attenuation increases with the
increase of frequency. When the coarse grain and
casting in the presence of coarse heterogeneous
structure, the ultrasonic signal will produce abnormal
reflection, grass echo or tree echo, resulting in the
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reading error.
Coarse grain size and inconsistent densification of
tissues at different positions in the workpiece will
cause differences in sound velocity and make the
measurement results inaccurate.

Note:
● When measuring the casting with rough surface,
a coupling agent with high viscosity must be used.
● It is recommended to calibrate the sound velocity
of the material with a block of the same material and
direction as the measured object.
B.6.4 Probe Wear
The probe surface is acrylic resin. Long-term use will
increase its roughness, resulting in a decrease in
sensitivity. If the probe is badly worn, sandpaper or
whetstone can be used to smooth the surface. If the
measured value is still unstable, replace the probe.

B.6.5 Multilayer and Composite Materials

It is impossible to measure multilayer materials with
incompact bonding surfaces because ultrasonic waves
cannot penetrate uncoupled surfaces. Ultrasonic waves
cannot spread at uniform speed in composite materials,
so the gauges measuring thickness by ultrasonic
reflection principle are not suitable for measuring
multilayer and composite materials.

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B.6.6 Influence of Oxide Layer on Metal
Surface
Some metals, such as aluminum, have a dense oxide
layer on their surfaces. This oxide layer is closely
bonded with the matrix, but the spread speeds of
ultrasonic wave in these two substances are different,
so it will cause error. Please pay attention to this
condition when using. Users can select a sample block
from the same batch of measured materials, measure its
thickness with micrometer or caliper, and calibrate the
gauge with this sample block.

B.6.7 Abnormal Thickness Reading

Operators should be able to identify abnormal readings,
which are usually caused by rust spots, corrosion pits,
and internal defects. Solutions can be found in the
relevant sections of this manual.

B.6.8 Selection and Use of Coupling Agents

The coupling agent is used as the carrier of ultrasonic
signal spread between the probe and the measured
material. If the type or use method of coupling agent is
improper, it may cause error, or the coupling symbol
flickers, and the measured value cannot be stable. The
coupling agent should be applied in appropriate amount
and coated evenly. Low viscosity coupling agents can
be used on smooth surfaces. High viscosity coupling
agents can be used on rough, vertical and top surfaces.

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B.7 Methods for Reducing Errors

B.7.1 Ultra-Thin Materials

With any ultrasonic thickness gauge, errors will occur
when the measured material thickness falls below the
lower limit of the probe.
When measuring ultra-thin materials, a false result called
"double refraction" sometimes occurs: the reading is
twice as thick as it actually is. Another type of false result
is called "pulse envelope, cycle jump": the measured
value is greater than the actual thickness. In order to
prevent such errors, the ultra-thin material
measurements should be checked repeatedly.

B.7.2 Rust Spots and Corrosion Pits

Rust pits on another surface of the measured material
(small rust spots are sometimes difficult to detect) will
cause irregular changes in the reading and in extreme
cases no reading at all. When pits are found, this area
should be measured with great care. Multiple
measurements can be performed by selecting the
orientation of the probe partition board at different
angles.
B.7.3 Material Identification Error
When the gauge is calibrated with one material and then
measures another, the wrong result will be obtained.
Please select the correct sound velocity.

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9. Packing List

NO. Item Quantity Remarks

Ultrasonic thickness
1 1
gauge
Standard 2 Probe (5MHz Φ10) 1
accessories 3 Coupling agent 1
4 Carrying bag 1
5 Data cable 1
6 User manual 1

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