YUSHI UM Series User manual

Ultrasonic Thickness Gauge
UM Series
Operating Manual
YUSHI INSTRUMENTS
CONTENT
1.General Information of The Gauge ................................................................. 1
1.1 Measuring Principle ..............................................................................1
1.2 Through Coating Function ................................................................... 2
1.3 Basic Configuration and Names of Various Parts ................................ 3
1.3.1 Names of Various Parts ............................................................. 3
1.3.2 Standard Configuration ............................................................. 4
1.3.3 Optional Accessories ................................................................. 4
2. Specifications ..................................................................................................4
3.Main Functions ................................................................................................ 5
4. Measuring Steps ..............................................................................................6
4.1 Gauge Preparation ................................................................................ 6
4.2 Velocity Setting .....................................................................................7
4.3 Velocity Measurement .......................................................................... 8
4.4 Gauge Calibration .................................................................................8
4.4.1 Fast Calibration ......................................................................... 8
4.4.2 2-Point Calibration .................................................................... 9
4.4.3 Difference between Fast Calibration and 2-Point Calibration ..9
4.5 Thickness Measurement ....................................................................... 9
5. Thickness Value Storing and Viewing ..........................................................10
5.1 Thickness Storing ............................................................................... 10
5.2 Thickness Viewing ..............................................................................11
6. Erasing the Storing Thickness Values.......................................................... 12
6.1 Erasing Individual Thickness Value ................................................... 12
6.2 Erasing Current File ........................................................................... 12
6.3 Erasing All Data ..................................................................................14
6.4 Erasing CAL Data ...............................................................................14
7. System Setup and Function Setup ................................................................ 14
7.1 System Setup ...................................................................................... 14
7.2 Function Setup .................................................................................... 15

7.3 Setting the Measuring Unit, Probe and Resolution ............................15
7.4 Min Capture ........................................................................................16
7.5 2-Point Calibration ............................................................................. 17
7.6 Brightness Setting ...............................................................................19
7.7 Limits Setting ..................................................................................... 20
7.8 Backlight Function ............................................................................. 21
7.9 Low Voltage Warning Function ..........................................................21
7.10 Ways of Turning Off ......................................................................... 21
8. Measurement Application .............................................................................21
8.1 The Condition Requirements on the Surface of the Work-piece ....... 21
8.1.1 Clean Surface ...........................................................................21
8.1.2 Enhancing the Roughness Requirement ..................................22
8.1.3 Surface of the Rough Machine Processing ............................. 22
8.2 Measuring Methods ............................................................................ 22
8.2.1 Single-Point Measurement ...................................................... 22
8.2.2 Double-Point Measurement .....................................................23
8.2.3 Multiple-Point Measurement ...................................................23
8.2.4 Continuous Measurement ........................................................23
8.3 Pipe Walls Measurement .................................................................... 23
8.4 Cast Measurement .............................................................................. 24
9. Maintenances and Cautions ..........................................................................24
9.1 Power Source Inspection .................................................................... 24
9.2 Cautions .............................................................................................. 25
9 . 2 . 1 G e n e r a l C a u t i o n s ..........................................................25
9.2.2 Measuring Cautions ..........................................................25
9.2.3 Changing the Prob e ..........................................................25
9.3 Maintenances ...................................................................................... 26
10. After-Sale Services ..................................................................................... 26
Appendix A: Sound Velocities of Some Common Materials………...............27
Appendix B: Probe and Measuring Range…………………………...............28
1.General Information of The Gauge
UM series ultrasonic thickness gauge made by our factory is a simple-to-use,
highly accurate, hand-held ultrasonic thickness gauge with the operating
principle of ultrasonic wave measuring. It can measure quickly,
nondestructively and precisely with a resolution of 0.001in/0.01in or
0.01mm/0.1mm. This instrument can be widely used in the fields such as
manufacturing, metal processing, chemistry and business inspecting for
measuring the thickness of all sorts of materials where ultrasonic wave can
spread through with a constant speed and get the reflection from the back side.
Apart from making accurate measure on various kinds of plates and
processing components, it can also make detection on various kinds of pipes
and pressure containers of the manufacturing facilities about their thickness
loss after corrosion. It’s the necessary specialized instrument for material
protection.
This manual applies to the models of UM-1, UM-1D, UM-2 and UM-2D
ultrasonic thickness gauges, the difference between them in the list below:
Note: The schematic diagram and features in the manual reference to UM-2
model without special mark.
1.1 Measuring Principle
UM series ultrasonic thickness gauge measures the thickness of an object by
precisely calculating the times of the probe sending ultrasonic pulse with the
help of couplant to the object and passing through the object until the probe
receiving the reflection from the boundary.
Model
UM-1
UM-1D
UM-2
UM-2D
Resolution
0.1mm
0.1mm
0.01mm
0.01mm
Through coating function
N
Y
N
Y
Probe selection function
N
N
Y
Y
1

1.2 Through Coating Function
There are two operating modes of UM-1D / UM-2D ultrasonic thickness
gauge: standard mode and coating mode. The principle of coating mode is E-E
(echo-echo). When there is coating or paint on the surface of the object, the
net thickness of the material can be directly measured neither having to
remove the coating nor calibration. While the defect of this mode is that the
measuring range is relatively narrow: 3mm-18mm (with standard probe). The
principle of standard mode is P-E. With the covered coating, the measurement
will not be very accurate, so the coating should be removed before measuring
in standard mode. The advantage of this mode is that the measuring range is
relatively wide: 0.8mm-300mm.
Press MENU key to make “Std/Coat” into highlighted, and then press ENTER
to alter between the two modes.
1.3 Basic Configuration and Names of Various Parts
1.3.1 Names of Various Parts
LCD Screen Display:
m/s——unit of material velocity BATT——Sign of low voltage
mm/inch——units of thickness 凸——Sign of good-coupling
PT-08——applying probe
Keyboard Function Illustration:
ON——Open VEL ——Velocity
MENU——Menu MEM——Memory
CAL——Calibration ——Backlight
——Enter △▽——Turn
2 3

1.3.2 Standard Configuration
UM series thickness gauge
Standard probe
Carrying case
Two 1.5V AA alkaline batteries （Air transport is prohibited）
Couplant （Air transport is prohibited）
Operating manual
Certification of quality
Packaging list
Warranty card
1.3.3 Optional Accessories
Rubber sheath
Numerous special probes on request (High-temperature probe, cast iron probe,
small probe, mini probe)
Probe cables
Step block for calibration
Data transmission cable
Application software
2. Specifications
Display:
128×64 dot-matrix LCD screen
Measuring Range on Standard Mode:
0.8mm~300mm; (According to probe and material)
Measuring Range on Coating Mode (only UM-1D& UM-2D):
3mm~18mm (Use standard probe)
Measuring Limits of Tube (Steel):
Φ20mm×3.0mm(PT-08 probe)
Φ15mm×2.0mm(PT-06 probe)
The measuring error is up to ±0.1mm
Measuring Error:
UM-1 and UM-1D:
Low limit to 10mm: ±0.1mm
10mm to high limit: ± (1%H+0.1) mm
UM-2 and UM-2D:
Low limit to 10mm: ±0.05mm
10mm to high limit: ± (0.5%H+0.01) mm
Note: H is the actual thickness of the measurement material
R e p e a t a b i l i t y :
UM-1 and UM-1D: ±0.1mm
UM-2 and UM-2D: ±0.05mm
Display Resolu tio n :
UM-1 and UM-1D: 0.1mm
UM-2 and UM-2D: H﹤100.0mm: 0.01/0.1mm selectable
H≧100.0mm: 0.1mm
Measurement Update rate:4 Hz
Ma terial V el oc ity Ra ng e: 1000 ~ 9999 m/s
Op er at ing Temp era tu re : -10℃~60℃
Po we r :
Two 1.5V AA alkaline batteries
Size: 149mm×73mm×32mm (H×W×D)
We i gh t :
160g (no include batteries)
3.Main Functions
☆Through coating function (only UM-1D and UM-2D).
☆Modifying systematical errors by using the 4mm standard block on the
instrument.
☆Data logger: Up to 500 readings can be divided into 5 different material
files for easy store and management. The data cannot get lost after power off.
☆Thickness restriction alarm: set the thickness limits and the value out of
the limits will cause the alarm ringing.
4 5

5900 m / s
5905 m / s
5900 m / s
6320 m / s
☆Minimum value scanning (MIN Capture mode): catch the minimum value
during the measurement.
☆2-point calibration: Curve surface measurement or other special application
with a high precision.
☆2 thickness units of mm and inch.
☆5 different velocities can be stored.
☆The calibration value can be stored automatically without loss after turning
off the gauge.
☆Low voltage warning function.
☆Backlight: Bring convenience to night working.
☆Delete: The skeptical data in the file or the whole file can be deleted,
so that new data can be stored.
☆Automatic shut off: Five minutes without operating.
☆Language: English and Chinese.
☆Coupling state identification: The stability of coupling can be aware by the
coupling mark.
4. Measuring Steps
4.1 Gauge Preparation
After plugging-in the probe connector to the gauge and pressing ON, there
will be two beep and the screen lights up. The velocity displayed is that of last
time. The screen display is as follows:
4.2 Velocity Setting
With the known velocity of the material, the build-in velocity can be set
manually according to the Velocity List in the appendix. Totally, there are 5
velocities can be stored in the gauge. The steps are as follows:
If the present displays is not the velocity, press VEL to enter the velocity status.
The velocity in the present velocity storing file will display and every time
you press VEL, the 5 velocities will change in turn. See the following figures:
Press VEL to enter the velocity status Press VEL to change the velocity If
there is not the needed velocity, press △or ▽to change. At the same time,
you can store the velocity to the gauge so that you can easily find it next time.
See following figure:
Press △or ▽to change
The ▲ below ones place, tens place and hundreds place can be moved when
adjusting the velocity value and every time you press △or ▽, the value will
be added by 1, 10, and 100 in turn. Press to move the ▲.
Save1 Menu Limit OFF
▲
PT-08
Save1 Menu Limit OFF
▲
PT-08
Save1 Menu Limit OFF
▲
PT-08
Save1 Menu Limit OFF
▲
PT-08
6 7

10. 0 0 ㎜
4.0 0 ㎜
4.3 Velocity Measurement
With the unknown material velocity, velocity calibration is necessary.
Do as the following steps:
1Prepare a testing block of the same component with the testing object.
Make its surface suitable for testing. Then measure the thickness of the block
with a slide caliper.
2Measure the thickness of the prepared testing block with the ultrasonic
thickness gauge.
3Press VEL and adjust △or ▽until the thickness is the same with the
known thickness of the testing block. The velocity displayed is that of the
testing object.
4The velocity will be stored into the present velocity unit automatically.
4.4 Gauge Calibration
4.4.1 Fast Calibration
Calibration should be made every time after changing the probe, which is very
important to ensure the accuracy of the testing. Fast calibration can be made
every time before testing if necessary.
Spread the couplant on the testing block on the gauge, and make the probe
coupled to the testing block until the coupling mark appears without
flickering. Then press CAL to finish calibration. If the velocity is 5900m/s, the
thickness value display is 4mm. See the following figure:
Tips: If the velocity is not 5900m/s, the thickness value is not 4.0mm after fast
calibrating and testing the block on the gauge, which is a common
phenomenon.
4.4.2 2-Point Calibration
In order to make curve surface measurement or other special application with
a high precision, 2-point calibration can be applied. For detail see Chapter 7.5.
4.4.3 Difference between Fast Calibration and 2-Point Calibration
①Fast calibration use the testing block on gauge, while 2-point calibration can
use any block of various materials and thicknesses.
②Fast calibration use only one testing block, while the 2-point calibration use
two blocks in different thicknesses.
4.5 Thickness Measurement
After calibration and velocity setting, spread the couplant on the testing area
of the object and coupled the probe with the object completely. The screen will
display the thickness value of the testing object. See the following figure:
Note: When the probe is coupling to the testing material, there will be a
coupling sign 凸on the screen; On the contrary, if the coupling status is not
very good, the coupling sign won’t appear, or it will keep flittering. See the
following figure:
凸
Save1 Menu Limit OFF
▲
PT-08
凸
Save1 Menu Limit OFF
▲
PT-08
8 9

10. 0 0 ㎜
5900 m / s
5900 m / s
5900 m / s
5. Thickness Value Storing and Viewing
5.1 Thickness Storing
Up to 500 thickness values can be divided into 5 files for storing.
Firstly, choose the storing file number. Press MENU key to make “Save” into
highlighted. See the following figure:
Press to change the file number so that the storing file number can be
fixed. The five files will display in turn. See the following figure:
Secondly, measure thickness.
Thirdly, save reading. After measuring the thickness, the screen will display
the thickness. Then press MEM, there will be a word “Memory” shinning once
in the lower left corner, meaning that the storage has finished and the reading
has been stored in the corresponding file.
5.2 Thickness Viewing
Press MENU to make “Save” into highlighted. Then press , and the five
files will display in turn so that you can choose the file you want to check. See
the following figure:
Finally, press MEM key to enter the file. See the following figure:
Note: “No.” is the number of the present data in the file; “Total” is the total
quantity of the data in the present file. You can check the readings in this file
by pressing △or ▽. Press MENU or continue measuring will back to the
main operation interface after checking.
Save1 Menu Limit OFF
▲
PT-08
Save1 Menu Limit OFF
▲
PT-08
Save3 Menu Limit OFF
▲
PT-08
No.001
Total: 005
[ENTER] to erase
Save3 Menu Limit OFF
▲
PT-08
4.0 0 mm
10 11

6. Erasing the Storing Thickness Values
6.1 Erasing Individual Thickness Value
In the state of thickness viewing, press ENTER key to delete the present
reading.
1Enter into the state of thickness viewing. See the following figure:
②Press ENTER key to delete the present reading and the next reading will
appear. See the following figure:
6.2 Erasing Current File
To delete all the content in the current file, do as the following steps:
1Press MENU key to make “Menu” into highlighted. See the following
figure:
Press ENTER key to enter the menu and make “Function setup” into
highlighted by pressing ▽. See the following figure:
2Press ENTER key to enter the interface, and select “Erase file” by
pressing △or ▽. See the following figure:
3After selection, press ENTER and the screen displays as follows:
Then, press ENTER to confirm deleting the current file, or press MENU to
back to the last interface.
4After deleting, press VEL or MENU to go back to the main operation
interface.
System setup
Function setup
[ENTER] to select
↑to up
Press [ENTER]
to confirm
Press [MENU]
to cancel
3.0 0 mm
No.001
Total: 004
[ENTER] to erase
4.0 0 mm
No.001
Total: 005
[ENTER] to erase
Save1 Menu Limit OFF
5900 m / s
▲
PT-08
Erase file
Erase all data
Erase CAL data
[ENTER] to select
↓to down
12 13

6.3 Erasing All Data
To delete all the thickness values in the gauge, just select “Erase all data” and
do other steps as above.
6.4 Erasing CAL Data
To delete the calibration thickness value, just select “Erase CAL data” and do
other steps as above.
7. System Setup and Function Setup
7.1 System Setup
Press MENU to make “Menu” into highlighted. See the following figure:
Then, press ENTER key to enter into the menu. See the following figure:
The “System setup” is highlighted (if not, you can adjust by moving △or▽),
and press ENTER to enter into system setup menu. Press △or▽to select the
item you want to alter, and press ENTER to make the alteration.
There are six items in system setup totally, they are: units (metric and
imperial), probe (only UM-2 and UM-2D), resolution (only UM-2 and
UM-2D), min capture, 2-point cal and language. You can set these items
according to your need. After setting, you can go back to the main operation
interface by pressing MENU or start measuring.
7.2 Function Setup
Press MENU key to make “Menu” into highlighted. Then, press ENTER key
to enter into the menu. See the following figure:
Make “Function setup” into highlighted by moving △or▽, and press ENTER
key to enter into function setup menu. Press △or▽to select the item you
want to erase or alter, and press ENTER to make it.
There are four items in function setup totally, they are: erase file, erase all data,
erase CAL data and set brightness. You can set these items according to your
need. After setting, you can go back to the main operation interface by
pressing MENU or start measuring.
7.3 Setting the Measuring Unit, Probe and Resolution
The detailed steps are as follows:
1Enter into the system setup menu, and then move the cursor to “Units” by
moving △or▽. Alter the unit between METRIC and IMPERIAL by pressing
ENTER key. See the following figures:
Save1 Menu Limit OFF
5900 m / s
▲
PT-08
System setup
Function setup
[ENTER] to select
↑to up
System setup
Function setup
[ENTER] to select
↓to down
Choosing the altering item
After altering by pressing ENTER
Units：METRIC
Probe：PT-08
Resolution：HIGH
[ENTER] to select
↓to down
Units：IMPERIAL
Probe：PT-08
Resolution：HIGH
[ENTER] to select
↓to down
14 15

②Enter into the system setup menu, and then move the cursor to “Probe” by
moving △or▽. Alter the unit among PT-08，5P-10，PT-12，ZT-12，GT-12，
PT-04 and PT-06 by pressing ENTER key. See the following figures:
Note: Only UM-2 and UM-2D have the probe selection function, to make
precise measuring, alter the probe type when choosing different probes.
③Enter into the system setup menu, and then move the cursor to “Resolution”
by moving △or▽. Alter the unit between HIGH (0.01mm) and LOW (0.1mm)
by pressing ENTER key. See the following figures:
Note: only UM-2 and UM-2D have “Resolution” item.
7.4 Min Capture
Min capture means catching the minimum thickness value among the
measuring results when measuring. The detailed setting steps are as follows:
a) Enter into the system setup menu, and then set “Min capture” ON. (OFF
means to close Min capture while ON means to open the function) See the
following figures:
b) After setting, press MENU key to go back to the main operation interface.
See the following figure:
Note: with “Min capture” on, when the probe is coupling to the work-piece,
the screen displays the present thickness value; when lifting the probe up, the
screen displays the minimum thickness value among the measuring results,
and the min capture sign “MIN” flickers for six times. If you continue to
measure during the time the sign “MIN” flickering, the present thickness value
goes on participating the min capture. Measurement after the sign “MIN”
stops flickering makes the gauge start again to catch the minimum value.
7.5 2-Point Calibration
Choose two standard blocks of the same material, velocity and curve rate with
the testing object. The thickness of one of the blocks should be near to the low
limit of the measuring scope, while the thickness of the other to the high limit.
2-point calibration can improve the accuracy of measuring. The “2-Point
CAL” should be turned ON and the “Min capture” should be turned OFF
before using the “2-Point CAL” function. The detailed steps are as follows:
①Enter into the system setup menu, and then set “2-Point CAL” ON.
See the following figures:
Units：METRIC
Probe：PT-08
Resolution：HIGH
[ENTER] to select
↓to down
Choosing the altering item
Units：IMPERIAL
Probe：5P-10
Resolution：HIGH
[ENTER] to select
↓to down
After altering by pressing ENTER
Choosing the altering item
After altering by pressing ENTER
Probe：PT-08
Resolution: HIGH
Min capture ON
[ENTER] to select
↓to down ↑to up
Units：METRIC
Probe：PT-08
Resolution：LOW
[ENTER] to select
↓to down
After altering by pressing ENTER
Units：METRIC
Probe：PT-08
Resolution：HIGH
[ENTER] to select
↓to down
Choosing the altering item
Probe：PT-08
Resolution: HIGH
Min capture OFF
[ENTER] to select
↓to down ↑to up
Save1 Menu Limit OFF
10. 0 0
MIN PT-08
▲
16 17

2After setting, press MENU key to go back to the main operation interface.
With “2-Point CAL” on, the function of 2-point calibration can be used at any
time when measuring.
③Process the 2-point calibration. The detailed steps are as follows:
Firstly, measure the thickness of the thinner block. In the status of thickness
display, press CAL, and there will be a “Thin” mark on the top right corner.
Adjust the value to the standard low limit by using △or▽.
Secondly, press CAL, and there will be a “Thick” mark on the top right corner,
then measure the thickness of the thicker block. Adjust the value to the
standard high limit by using △or▽.
Finally, press CAL to finish the calibration.
7.6 Brightness Setting
The detailed steps are as follows:
1Enter into the function setup menu. Then move the cursor to “Set
brightness” by moving △or▽. See the following figure:
②Enter into the interface of brightness by pressing ENTER key. See the
following figure:
Adjust the brightness by moving △or▽. After finishing the adjustment, press
ENTER key to go back to the last interface and press MENU key to the main
operation interface.
Choosing the altering item
After altering by pressing ENTER
Resolution: HIGH
Min capture OFF
2-Point CAL：OFF
[ENTER] to select
↓to down ↑to up
Save1 Menu Limit OFF
20. 0 5 mm
Thick
PT-08
▲
Save1 Menu Limit OFF
10. 0 5 mm
PT-08
▲
Thin
[ENTER] to select
↓to down ↑to
up
Resolution: HIGH
Min capture OFF
2-Point CAL：ON
Erase all data
Erase CAL data
Set brightness
[ENTER] to select
↑to up
Brightness : 04
[ENTER] to Esc
[↑] to darken
[↓] to lighten
18 19

5900 m / s
5900 m / s
7.7 Limits Setting
UM series ultrasonic thickness gauge can set low limit and high limit to
realize the function of fast measurement.
The detailed steps are as follows:
1Move the cursor to “Limit” by pressing MENU key. See the following
figure:
②Enter into the limit interface by pressing ENTER key. The screen displays
the original settings of the limits. See the following figures:
The high limit and low limit can display in turn by pressing ENTER key. You
can also set the new limits by pressing △or▽.
③After setting, pressing VEL, MENU or start measuring can help you go
back to the main operation interface.
Note: If the present thickness of a work-piece is out of the limits, the buzzer in
the gauge will give an alarm automatically.
7.8 Backlight Function
The backlight function offers you convenience when getting the readings in
dark condition. At the same time, you should pay attention to saving electric
quantity.
Press and the backlight will be turned ON; press again, it will be turned
OFF. After turning off the gauge, the backlight will also turn off automatically.
7.9 Low Voltage Warning Function
When the voltage of the battery is low, there will be a “BATT” sign appear on
the screen. You should change the battery for further usage. See the following
figure:
7.10 Ways of Turning Off
There are two ways of turn off the gauge for you to choose: auto off and
manual off. The gauge will turn off in 5 minutes with no operation. You can
also press MENU key to move the cursor to “OFF” and press ENTER key to
turn off the gauge.
8. Measurement Application
8.1 The Condition Requirements on the Surface of the
Work-piece
8.1.1 Clean Surface
Before measuring, all the dust, dirt and rust corrosion should be removal, as
well as the covered paint.
High limit
Save1 Menu Limit OFF
30 0 . 0 mm
High limit
PT-08
PT-08
Save1 Menu Limit OFF
▲
BATT PT-08
Save1 Menu Limit OFF
▲
PT-08
Save1 Menu Limit OFF
0. 1 0 mm
Low limit
Low limit
20 21

8.1.2 Enhancing the Roughness Requirement
The extremely rough surface, such as the pebble-like finish of some cast irons,
will always arouse measuring error or reading lost, which be proved most
difficult to measure. Making the surface smooth before measuring is therefore
very important. Often, a wire brush or scraper will be helpful in cleaning
surfaces. Polishing, filing and grinding with rotary sanders or grinding wheels
may be used, though care must be taken to prevent surface gouging, which
will inhibit proper probe coupling. High-viscosity couplant is also usually
applied.
8.1.3 Surface of the Rough Machine Processing
The regular slugs after rough machine processing (such as lathing or planning)
on the surface of the work-piece may also arouse measuring errors. The
compensation methods have been mentioned in 8.1.2. In addition to posing
obstacles to measurement, rough surfaces contribute to excessive wear of the
probes, particularly in situations where the probe is “scrubbed” along the
surface. Probes should be inspected on a regular basis, for signs of uneven
wear of the wear face. If the wear face is worn on one side more than another,
the sound beam penetrating the test material may no longer be perpendicular
to the material surface. In this case, it will be difficult to exactly locate tiny
irregularities in the material being measured, as the focus of the sound beam
no longer lies directly beneath the probe. The test result may be more accurate
by adjusting the angle between the sound insulating wall (the metal film
through the center of the probe bottom) of the probe and the slugs of the
material and making them perpendicular or parallel with each other to get the
minimum reading as the thickness value.
8.2 Measuring Methods
8.2.1 Single-Point Measurement
This method involves measuring the thickness at a single point. Use the probe
to measure a random point on the surface of the testing object, the value
displayed is the thickness value.
8.2.2 Double-Point Measurement
This method involves performing two thickness measurements near a single
spot by using a dual crystal probe inclined at 0°and 90°respectively, with
respect to the split face. Take the smaller of the two indicated values as the
thickness of the material.
8.2.3 Multiple-Point Measurement
This method involves performing a number of measurements within a circle
having a maximum diameter of about 30mm.Take the minimum indicated
value as the thickness of the material
8.2.4 Continuous Measurement
Continuous measurement method involves taking continuous measurements
along a specified line according to the single measurement method, at
intervals of 5mm or less. Take the minimum indicated value as the thickness
of the material.
8.3 Pipe Walls Measurement
The thickness of a pipe can be measured accurately with this gauge.
The split-plane of the probe may be along the pipe axis or perpendicular to it
as shown in the following figures:
Pipe samples
In this case, the readings on the screen will change with some regular patterns
and the smallest display value should be taken as the thickness value.
For small pipes, measurement should be made in both directions (moving
probe a little bit). For large pipes, measure the thickness of the wall along the
direction perpendicular to the pipe axis. See the following figure:
22 23

Bottom view of probe
8.4 Cast Measurement
There are special features of cast measurement. The grain size of cast material
is relatively rough, and the organization is not very tight. Added with the
rough surface measuring status, the measurement of cast material is very
difficult. So the following tips should be taken:
①Use low frequency probe like ZT-12 of our company.
②When measuring the cast work-piece with no processing on the surface,
high viscosity couplant such as machine oil, grease and water glass are
needed.
③Calibrate the sound velocity with the standard block, which shares the
same material and same measuring direction with the testing object.
④Programming 2-point calibration if needed.
9. Maintenances and Cautions
9.1 Power Source Inspection
When the power source voltage is low, there appears a low voltage sign.
Battery should be change promptly in order not to influence the accuracy of
the gauge. Backlight should not be always on, so that the battery can be used
for longer.
Change the battery as the following steps:
①Turn off the gauge.
②Open the battery cassette.
③Take out the battery, and put in new battery. Pay attention to the polarity.
For long time sparing the gauge, take out the battery in case that they will leak
out the battery electrolyte, which will corrode the battery case and pole piece.
9.2 Cautions
9.2.1 General Cautions
Avoid shocking and putting the caustic liquid (such as dilute and
ethyl alcohol) into the instrument and the probe. Wipe the cover and
window with little amount of water.
After using, the coupling paste and the dirt should be wiped away to
keep the instrument clean and free from rust.
Avoid dripping sweat on the gauge in high temperature. Spread
some grease on the testing block on the gauge if the gauge will not be
used for long and wipe it out when using.
Prevent the instrument from getting wet and do not leave it in a
humid atmosphere for a long time.
When the probe is being plugged into or unplugged from the socket,
just hold the metal lead of the plug and push/pull it straight along the
axis.
Do not rotate the plugs, or the probe cable may get damaged.
Take the batteries out of the chamber if the gauge will not be used
for a long time.
Don’t try to open the instrument, or the warranty will be void.
9.2.2 Measuring Cautions
1Only when the coupling sign appears and keeps stable, can you get
the reliable results.
2With the probe worn, the measurement readings will be unstable.
Please change in that case.
9.2.3 Changing the Probe
①When measuring different thicknesses, the readings are all the same.
②There are the sign of coupling and readings only with the probe plugged
into the socket and without measuring.
24 25

9.3 Maintenances
Contact with the maintaining department of our company with the following
problems:
①Components damage and the gauge cannot be used.
②The display of the screen is disordered.
③The measuring error is abnormally big with ordinary usage.
④Keyboard operation is disordered or doesn’t work.
As the ultrasonic thickness gauge is a sort of high-tech product, the fixing
work should be made by professional operator. Do not try to open the
instrument by yourself, or we will not be responsible for any of the problem
nor the maintenance service.
10. After-Sale Services
The ultrasonic thickness gauge products of our company have been tested
strictly with high standards. Customers can enjoy the following services:
①The warranty period is ONE year after buying and the gauge would be
maintained at any time for good. (The wear of the probe is not in the range
of fixing insurance)
②During the warranty period, the breakdowns caused by the quality
problems of the gauge itself can be fixed by our company for free with
your guarantee card.
③Our company offers you fixing service after the warranty period with a
reasonable costing fee.
Appendix A: Sound Velocities of Some Common Materials
Material
Sound Velocity
Inch/µS
M/s
Air
0.013
330
Aluminum
0.250
6300
Alumina Oxide
0.390
9900
Beryllium
0.510
12900
Boron Carbide
0.430
11000
Brass
0.170
4300
Cadmium
0.110
2800
Copper
0.180
4700
Glass(crown)
0.210
5300
Glycerin
0.075
1900
Gold
0.130
3200
Ice
0.160
4000
Inconel
0.220
5700
Iron
0.230
5900
Iron (cast)
0.180
4600
Lead
0.085
2200
Magnesium
0.230
5800
Mercury
0.057
1400
Molybdenum
0.250
6300
Monel
0.210
5400
Neoprene
0.063
1600
Nickel
0.220
5600
Nylon, 6.6
0.100
2600
Oil (SAE 30)
0.067
1700
Platinum
0.130
3300
Plexiglass
0.110
1700
Polyethylene
0.070
1900
Polystyrene
0.0930
2400
Polyurethane
0.0700
1900
Quartz
0.230
5800
Rubber, Butyl
0.070
1800
Silver
0.140
3600
26 27

Steel, Mild
0.233
5900
Steel, Stainless
0.230
5800
Teflon
0.060
1400
Tin
0.130
3300
Titanium
0.240
6100
Tungsten
0.200
5200
Uranium
0.130
3400
Water
0.584
1480
Zinc
0.170
4200
Tips: the table above is for reference, the actual velocities should be measured
with the method mentioned in 4.3 Velocity measurement.
Appendix B: Probe and Measuring Range
Probe
description
Frequency
(MHZ)
Diameter of
the contact
proportion
Measuring
range(in steel)
Available
contact
temperature
Cast iron probe
ZT12
2
17.2mm
(4.0～300.0)mm
(-10～60)℃
Standard probe
PT12
5
12.5mm
(1.0～200.0)mm
(-10～60)℃
Standard probe
PT08
5
10.5mm
(0.8～100.0)mm
(-10～60)℃
Small probe
PT06
7.5
8.5mm
(0.8～30.0)mm
(-10～60)℃
Tiny probe
PT04
10
7.1mm
(0.7～12.0)mm
(-10～60)℃
High temperature
probe
5
15mm
(4.0～80.0)mm
Below 300℃
28