- 47 -

7.12 Material Selection

1) Select the previous menu option

2) Select the next menu option

3) Enter the selected menu option

4) Exit menu and return to the

main screen

7.11 Menu

The menu includes: material selection, sound speed adjustment,

unit setting, record operation, system setting, about, restore

factory settings. Long press to enter the menu, the

operation is as follows:

Select the option in menu.

1) Move up to select material

2) Move down to select material

3) Confirm the selected material

and return to menu

4) Return to menu

Menu

Mat

Record About

Reset

Setting

Spd Unit

Mat

Steel 5740

SS 4399

Brass 4720

Copper 5930

Iron 5110

Cast iron 2400

Plumbum 2680

Nylon 3607

Silver 3251

Mat

- 48-

Select the option in Setting. Adjustable range of sound

speed: default ±200m/s (0.008in/us), adjustable range of

customizable material: 1000m/s to 9999m/s (0.039in/us to

0.394in/us).

1) Increase the sound speed value,

long press it to increase the

adjustment range

2) Reduce the sound speed value,

long press it to increase the

adjustment range

3) Save and return to menu

4) Return to menu

7.14 Unit Setting

7.13 Sound Speed Adjustment

Select option in Setting.

1) Move up to select unit

2) Move down to select unit

3) Save and return to menu

4) Return to menu

Unit

Spd

Spd

5740 m/s

0.1 mm

0.01 in

Unit

0.01 mm

- 49 -

Select \"Browse from the first page\" function in the record

operation interface, and the instrument will display the record

list from the first page, and display the record number and

current value of each record.

1) Page up

2) Page down

3) Enter the selected page

4) Return to Record Operation

interface

1) Move up to select function

2) Move down to select function

3) Enter the selected function

4) Return to menu

Select the option in Setting. When the instrument has

no record, the message \"No stored value\" is displayed and the

record operation cannot be entered.

7.15 Record Operation

7.15.1 Browse from the First Page

Record

Records

From first page

From last page 从第一页浏览

From current item

Delete the selected item

Delete all

001 60.7 mm

002 42.7 mm

003 22.8 mm

004 20.3 mm

005 37.6 mm

006 57.8 mm

007 42.3 mm

008 22.7 mm

009 37.8 mm

DATA

- 50 -

Select the function of \"Browse from the selected group\" in the

record operation interface, and the user selects the record to

browse. The instrument displays the record list starting from

the page where the record is located, and displays the record

number and current value of each record.

In the record list and record details, the user can long press

to delete the currently browsing record. Short press

to view the previous or next record details.

View record details: Enter the selected page, press

to select a record number, and press to view details

(including the record number, current value, maximum value,

minimum value, and current value). After viewing the details,

press to return to the record list.

Select the function of \"Browse from the last page\" in the record

operation interface, the instrument will display the record list

starting from the last page record, and display the record

number and current value of each record. Refer to 7.15.1 for

operation.

7.15.2 Browse from the Last Page

7.15.3 Browse from the Selected Group

60.9

19.9

60.7

Steel 6081

001

60.7 mm

mm

mm

mm

Data

Mat

Max

Min

Avg

- 51 -

1) Adjust record number

2) Confirm the digit currently

modified (hundreds/tens/ones of the

record number). When the ones are

confirmed, enter the selected record

number

3) Return to the record operation

interface

7.15.4 Delete the Selected Group

Select the function of \"Delete Selected Group\" function in the

record operation interface, and the user can select the record

to be deleted.

Deletion prompt: In this interface, the user can confirm whether

to delete or not. Select \"Yes/No\" by , select Yes and

press to delete; Select No and press to return to the

Delete selected group interface. Press to return directly to

the Delete selected group interface.

It takes a while to delete the record, and the instrument will

indicate that it is being deleted.

1) Adjust record number

2) Confirm the digit currently

modified (hundreds/tens/ones of the

starting record/ending record). When

the ones of the ending record are

confirmed, the deletion prompt is

entered

3) Return to the record operation

interface

Del

Deleting ......

Del

Delete

Yes No

001-001

Select group

Select start group

From 001 To 028

001

Del Group

Select group range

(From 001 To 028)

From 001 To 001

- 52 -

7.16 System Setting

Select option in Menu.

1) Move up to select function

2) Move down to select function

3) Enter the selected function

4) Return to menu

Select \"Delete All\" function in the record operation interface, the

user can choose to delete all records. Select \"Yes/No\" by

. Select Yes, press to delete all records; Select No

and press to return to the record operation interface.

Press to directly return to the record operation interface.

7.15.5 Delete All Records

Del

Do you confirm to Delete

all saved data?

Yes No

Setting

Setting

Sound

Backlight 从第一页浏览

Power off

Alarm

Language

Light

Vibration

Del All

Deleting ......

- 53 -

1) Select sound Yes/No

2) Save and return to the menu

setting

3) Return to system setting

7.18 Backlight Setting

Select the \"Backlight\" function in the system setting interface to

adjust the backlight time.

Select the \"Power off\" function in the system setting interface.

7.19 Shutdown Time

Select the \"Sound\" function in Setting interface to enter the

sound Yes/No setting. Voice broadcast and prompt tone are on

or off at the same time.

1) Increase or decrease

backlight brightness

2) Confirm the backlight brightness

and adjust the backlight time

3) Increase or decrease

backlight time

4) Confirm the backlight brightness

and return to system setting

5) Return to system setting

7.17 Voice Setting

1) Increase shutdown time

2) Reduce shutdown time

3) Confirm the shutdown time

4) Return to system setting

Voice

Yes No

60 s

Backlight

TIME

300 s

Shut

TIME

- 54 -

1) Increase standard value/increase

tolerance limit

2) Reduce standard values/reduce

tolerance limits

3) Confirm standard values/confirm

tolerance limits and return to system

Settings

4) Return to system setting

Select \"Alarm\" function in the system setting interface to adjust

the standard value first, then press to adjust the tolerance

limit. Long press to increase the adjustment range.

7.20 Alarm Setting

Select the \"Language\" function in the system setting interface.

7.21 Language Setting

1) Move up to select function

2) Move down to select function

3) Save and return

4) Return to system setting

Alarm

Referance: 4.00 mm

Tolerance: ±0.01 mm

Language

中文

English

Select the \"Light\" function in the system setting interface.

7.22 Light Setting

1) ） Select Led Yes/No

2) Save and return

3) Return to system setting

Led

Yes No

- 55 -

1) Select Yes/No

2) Select Yes to restore the factory

settings; Select No to return to menu

3) Return to menu.

Select the option in the setting menu and press to

return to menu. The content will be updated in the future, and

will not be updated here. Please refer to the actual situation.

7.25 Restore Factory Settings

Select option in the setting menu, users can restore the

factory settings through this function.

7.24 About

Reset

About

About

Model name:SW-6510GT

Version: V. 202308

Do you confirm to restore

factory settings?

Yes No

Reset

Select the \"Vibration\" function in the system setting interface.

7.23 Vibration Setting

Shake

Yes No 1) ） Select Shake Yes/No

2) Save and return

3) Return to system setting

- 56 -

8 Measurement Application Technique

● Single point measurement method: at any point of the

measured body, using the probe to measure, the displayed

value is the thickness value.

● Two-point measurement: a second measurement is made

with a probe at the same point of the measured body.

In the secondary measurement, the parting plane of the

probe is 90°, and the smaller value is the thickness value.

● Multi-point measurement method: multiple measurements

are made in a circle with a diameter of about 30mm, and the

minimum value is taken as the thickness value.

● Continuous measurement method: the single point

measurement method is used to continuously measure along

the specified line, the interval is not less than 5mm, and the

minimum value is the thickness value of the measured body.

8.1 Measurement Method

8.2 Pipe Wall Measurement Method

When measuring, the parting plane of the probe can measure

along the axis of the pipe or the axis of the vertical pipe

respectively. If the pipe diameter is large, it should be measured

in the direction of the vertical axis; When the pipe diameter is

small, it should be measured in two directions, and the minimum

value is the thickness value.

- 57 -

9 Maintenance and Notes

9.1 General Notes

● Avoid strong vibration of the instrument and probe;

● Avoid placing the instrument in too humid environment;

● When inserting and removing the probe, pinch the movable

coat and force along the axis. Do not rotate the probe to avoid

damaging the probe cable core.

● The attachment of oil and dust will make the probe line

gradually aging and fracture, and the dirt on the cable should

be removed after use.

9.2 Precautions in Measurement

● When measuring, only when the coupling icon appears and

is stable, it is a good measurement;

● If there is a large amount of coupler on the surface of the

measured body, the couplant will cause mismeasurement

when the probe leaves the surface of the measured body.

Therefore, at the end of the measurement, the probe should

be quickly removed from the surface of the measured body.

● The surface of the probe is acrylic resin, which is sensitive to

the scratching of rough surfaces, so it should be gently

pressed in use. When measuring rough surfaces, minimize

the scratching of the probe on the working surface.

● When measuring at room temperature, the surface of the

measured object should not exceed 60°C, otherwise the

probe can no longer be used.

● If the probe is worn out, the measurement will show unstable

values, so the probe should be replaced.

- 58 -

Due to the need to apply coupler when calibrating the

instrument using the calibration test block, please pay attention

to the rust prevention of the test block. Wipe the calibration

test block clean after use. Avoid perspiration when the

temperature is high. If not used for a long time, it should be

coated with a little grease on the surface of the random test

block to prevent rust. When used again, it can work normally

after wiping the grease.

9.3 Cleaning of the Calibration Test Block

9.4 Cleaning of the Housing

Alcohol, diluent, etc., have a corrosive effect on the housing,

especially the screen, so when cleaning, gently wipe with a wet

cloth.

9.5 Instrument Maintenance

When the instrument appears abnormal phenomenon (such as

failure of measurement due to instrument damage; Abnormal

LCD display; Excessive error in normal use; Keyboard

operation failure or confusion, etc.), please do not remove or

adjust any fixed assembly parts, please contact the after-sales

service, the maintenance department of our company to

implement the warranty regulations.

- 59 -

Note: The sound speed listed are approximate values for

reference only.

Appendix A Material Sound Speed

Material in/µs

Aluminum

Steel

Gold

Zinc

Titanium

Tin

Acrylic resin

Epoxy resin

Ice

Nicke

Plexiglass

Porcelain

PVC

Quartz

Rubber,vulcanized

Titanium

Tin

Acrylic resin

Epoxy resin

Ice

Nicke

Plexiglass

Porcelain

PVC

Quartz glass

Rubber

Customization 1 User Definition 1

m/s

User Definition 2

User Definition 3

Customization 2

Customization 3

Sound Speed

Aluminum

Common

Stainless

Brass

Copper

Iron

Cast iron

Lead

Nylon

Silver

Gold

Zinc

Brass

Copper

Iron

Cast iron

Lead

Nylon

Silver

0.233

0.233

0.233

0.250

0.233

0.226

0.173

0.186

0.233

0.173~0.229

0.094

0.105

0.142

0.128

5920

5920

5920

6340~6400

5920

5740

4399

4720

5930

4400~5820

2400

2680

3607

3251

0.164

0.236

0.117

0.109

0.100

0.157

0.222

0.106

0.230

0.094

0.222

0.091

4170

5990

2960

2760

2540

3988

5639

2692

5842

2388

5639

2311

Steel

- 60 -

B.1 Influence of Surface Condition on Measurement

Results

B.1.1 Surface covering

Before measurement, all dust, dirt and rust on the surface of the

object to be measured should be removed, and paint and other

coverings should be removed.

B.1.2 Rough surface

A surface that is too rough can cause measurement errors or

even no readings from the instrument. The surface of the

material to be tested should be as smooth as possible before

measurement, and can be made smooth by grinding, throwing,

filing, etc. High viscosity couplants can also be used.

B.1.3 Rough finished surface

Regular fine grooves caused by rough machined surfaces

(such as lathes or planers) can also cause measurement errors

and are treated in the same way. In addition, adjust the angle

between the ultrasonic probe's crosstalk spacer plate (thin metal

layer passing through the center of the bottom surface of the

probe) and the fine groove of the material to be measured, so

that the spacer plate and the fine groove are perpendicular or

parallel to each other, and take the minimum value of the

readings. As a measurement of thickness, better results can be

achieved.

B.1.4 Cylindrical surfaces

When measuring cylindrical materials, such as pipes, oil drums,

etc., it is very important to select the correct angle between the

probe crosstalk barrier and the axis of the material to be

measured. Simply speaking, couple the probe with the material

to be tested, the probe crosstalk barrier plate is parallel or

perpendicular to the axis of the material to be tested, slowly

shake the probe perpendicular to the axis of the material to be

Appendix B Common Problems and Solutions in

Ultrasonic Thickness Measurement

- 61 -

tested, the reading on the screen will change regularly, Select

the lowest value of the readings as the measured thickness of

the material. According to the curvature of the material, select

the correct direction of the angle between the probe crosstalk

barrier plate and the axis of the material to be tested. For pipes

with larger diameters, select the probe crosstalk barrier plate

perpendicular to the axis of the pipe; for pipes with smaller

diameters, select two measurement methods, parallel and

perpendicular to the axis of the pipe, and take the minimum

value of the readings as the measurement thickness.

B.1.5 Composite shape

When measuring materials with composite shapes (such as pipe

elbows), the method described above can be used, the difference

is that a second measurement is required, and the two values of

the probe crosstalk barrier plate perpendicular to the axis and

parallel to the axis are read respectively, the smaller of which

is taken as the thickness measurement of the material at the

measurement point.

B.1.6 Non-parallel surfaces

In order to obtain a stable and reliable thickness measurement

value, the other surface of the measured material must be

parallel or coaxial with the measured surface, otherwise it will

cause a large measurement error or no reading display at all.

B.2 Influence of temperature on measurement results

The thickness of the material and the propagation speed of

ultrasonic waves in the material are affected by temperature.

When the measurement accuracy is high, the test block comparison method can be used, that is, the test block of the same

material and approximate thickness is used for measurement

under the same temperature conditions, and the temperature

compensation coefficient is obtained, and this coefficient is

used to correct the measured value of the workpiece.

- 62 -

Accurate measurement of different materials under different

conditions, the closer the material of the calibration block is to

the material to be tested, the more accurate the measurement

will be. The ideal reference test block would be a set of test

blocks of different thicknesses of the material being tested that

provide the instrument to compensate for correction factors

(such as material microstructure, heat treatment conditions,

particle orientation, surface roughness, etc.). A set of reference

blocks will be important in order to meet the requirements for

maximum accuracy measurements.

In most cases, satisfactory measurement accuracy can be

obtained using only one reference block, which should be of the

same material and similar thickness as the material being tested.

Take a uniform material to be tested and measure it with a

micrometer and then it can be used as a test block.

For thin materials, when its thickness is close to the lower limit

of the probe's measurement, a test block can be used to

determine the exact lower limit. Do not measure material below

the minimum thickness. If a thickness range can be estimated,

then the thickness of the test block shall be selected as the

upper limit. When the material to be tested is thick, especially

alloys with complex internal structures, a test block that is close

to the material to be tested should be selected in a set of test

blocks to facilitate mastering the calibration.

B.3 Influence of material attenuation on measurement

results

B.4 Use of reference blocks

For some materials such as fibers, porous, coarse crystals, etc.,

they will cause a lot of scattering and energy attenuation of

ultrasonic waves, so that the instrument may have abnormal

readings or even no readings (usually abnormal readings are

smaller than the actual thickness). In this case, the material is

not suitable for thickness measurement with this thickness gauge.

- 63 -

The internal structure of most forgings and castings is directional.

In different directions, there will be a small change in the speed

of sound. To solve this problem, the test block should have an

internal structure in the same direction as the material to be

tested, and the sound waves in the test block. The direction of

propagation should also be the same as in the material being

tested. In some cases, the sound velocity table of known

materials can be substituted for the reference test block, but

this is only an approximate replacement for some reference test

blocks. In some cases, the value in the sound velocity table is

different from the actual measurement. This is because the

material The physical and chemical conditions are different.

This method is often used to measure mild steel, but only as a

rough measure. This thickness gauge has the function of

measuring the speed of sound, so it can first measure the

speed of sound, and then measure the workpiece at this speed

of sound.

Casting measurement has its particularity. The grain of the

casting material is relatively coarse, the structure is not dense

enough, and the measurement is often performed in a rough

state, so the measurement encounters greater difficulties. The

first is that the coarseness of the grains and the insufficiency of

the structure cause a great attenuation of the sound energy.

The attenuation is caused by the scattering and absorption of

the sound energy by the material. The degree of attenuation is

closely related to the grain size and ultrasonic frequency. At the

same frequency, the attenuation increases with the increase of

the grain diameter, but there is a maximum point. Beyond this

point, the grain diameter increases and the attenuation basically

tends to be higher. to a fixed value. For probes of different

frequencies, the attenuation increases with increasing frequency.

Secondly, when the grains are coarse and there is a coarse

heterophase structure in the casting, the ultrasonic signal will

be abnormally reflected, and a grass-like echo or a tree-like

B.5 Casting Measurements

- 64 -

echo will be generated, which will cause an incorrect reading in

the thickness measurement result and cause a misjudgment.

In addition, with the coarsening of the grains, the anisotropy in

the crystallographic direction of the metal becomes more

pronounced, resulting in differences in the speed of sound in

different directions, and the maximum difference can even

reach 5.5%. Moreover, the density of the tissue at different

positions in the workpiece is also inconsistent, which will also

cause differences in the speed of sound. These factors will

cause inaccurate measurement results. Therefore, special care

should be taken when measuring castings.

● When measuring castings with rough surfaces, a couplant

with a higher viscosity must be used.

● It is recommended to use the same material as the object to

be tested and a test block with the same measurement

direction as the object to be tested to calibrate the sound

velocity of the material.

When measuring castings, pay attention to:

Using any ultrasonic thickness gauge, when the thickness of the

material to be tested falls below the lower limit of the probe, it

will cause measurement errors. If necessary, the minimum limit

thickness can be measured by the test block comparison method.

When measuring ultra-thin materials, an erroneous result called

\"double refraction\" sometimes occurs, which occurs when the

displayed reading is twice the actual thickness; another

erroneous result is called \"pulse envelope, cyclic \"Jump\", its

phenomenon is that the measured value is greater than the actual

thickness, in order to prevent such errors, the measurement

should be repeated when measuring critical thin materials.

B.6.1 Ultra-thin materials

B.6 Methods to reduce measurement errors

- 65 -

B.6.3 Material identification errors

When the instrument is calibrated with one material and then

used to measure another material, erroneous results will occur,

and care should be taken to select the correct speed of sound.

B.6.4 Wear of the probe

The surface of the probe is made of acrylic resin. Long-term

use will increase the roughness and reduce the sensitivity of the

probe. If the probe is severely worn and results in a large error

in the measurement results, a small amount of sandpaper or

oilstone can be used to polish the probe surface to make it

smooth and ensure parallelism. If the measured value is still

unstable, the probe needs to be replaced.

B.6.5 Multilayer materials, composite materials

It is not possible to measure multi-layer materials with loosely

bonded surfaces, because ultrasonic waves cannot penetrate

uncoupled surfaces. Because ultrasonic waves cannot propagate

at a uniform speed in composite materials, instruments that use

the principle of ultrasonic reflection to measure thickness are

not suitable for measuring multi-layer materials and composite

materials.

Rust spots and pits on the other surface of the tested material

(small rust spots are sometimes difficult to find), etc., will cause

irregular changes in readings, and even no readings in extreme

cases. When a pit is found or suspect, the measurement of this

area must be very careful, and the probe crosstalk barrier can

be positioned at different angles to make multiple tests.

B.6.2 Rust spots, corrosion pits, etc.

- 66 -

B.6.6 Influence of oxide layer on metal surface

Some metals may have a denser oxide layer on their surface,

such as aluminum, etc. This layer of oxide layer is closely

combined with the substrate, and there is no obvious interface,

but the propagation speed of ultrasonic waves in these two

substances is different, so it will cause measurement error, and

the size of the error is also different for the thickness of the

oxide layer. Please pay attention to this situation when using it.

You can choose a sample block from the same batch of tested

materials, measure its thickness with a micrometer or caliper,

and use this sample block to calibrate the instrument.

B.6.7 Abnormal thickness readings

The operator should have the ability to identify abnormal

readings, usually rust spots, corrosion pits, and internal defects

in the tested material will cause abnormal readings. For

solutions, refer to the relevant chapters of this manual.

B.6.8 Selection and use of couplant

The couplant is used as a carrier of ultrasonic signal propagation

between the probe and the material to be measured. If the type

of couplant or use method is improper, it may cause a large error,

or the coupling mark will flicker, and the measured value will not

be stable. The coupling agent should be used in an appropriate

amount and applied evenly. It is important to choose the right

type of couplant. When used on smooth material surfaces, low

viscosity couplants (such as randomly configured couplants)

can be used; when used on rough material surfaces, or vertical

surfaces and top surfaces, higher viscosity couplants are

required.

Sndway Technology (Guangdong) Co., LTD

全国咨询服务热线/ Service Hotline：400-125-6969

深达威科技（广东）股份有限公司

Add: Sndway Science & Technology Industrial Park, 58

Tuanjie Road, Humen 523930, Dongguan, China

地 址：东莞市虎门镇虎门团结路58号深达威科技园

电 话 / Tel：0769-85265688

网 址/ Web：www.sndway.com

邮 箱/E-mail：market@sndway.com