DGC DC-3000 Series User manual

Ultrasonic Thickness Gauge
DC-3000 series
Instruction Manual
V.7.11

CONTENTS
1. General Description .....................................................................- 1 -
2. Technical Specifications................................................................- 1 -
3. Standard Delivery ........................................................................- 2 -
4. Overview the Display Unit............................................................- 2 -
5. Keypad Functions.........................................................................- 3 -
6. Display Screen..............................................................................- 4 -
7. Preparation before measurement.................................................- 4 -
【7.1】Preparation of the instrument ..............................................- 4 -
【7.2】Selection of the Probe ...........................................................- 5 -
【7.3】Treatment of the measured surface......................................- 5 -
8. Basic Gauge Operations................................................................- 6 -
【8.1】Switch on ...............................................................................- 6 -
【8.2】Probe Zero .............................................................................- 6 -
【8.3】Backlight ................................................................................- 6 -
【8.4】Measurement mode..............................................................- 7 -
【8.5】Setting....................................................................................- 8 -
【8.6】Memory ...............................................................................- 12 -
【8.7】Function...............................................................................- 13 -
9. Measuring technology................................................................- 15 -
【9.1】Measuring methods...........................................................- 15 -
【9.2】Pipeline measurement method.........................................- 16 -
10. Maintenance and precautions ..................................................- 16 -
【10.1】Power check.......................................................................- 16 -
【10.2】Precautions........................................................................- 16 -
10.2.1 General precautions............................................................- 16 -
10.2.2 Precaution during the measuring........................................ - 16 -
APPENDIX 1: Sound Velocity Measurement Chart..............................- 18 -

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1. General Description
The Ultrasonic Thickness Gauge DC-3000/DC-3020 is our new and
improved readout unit with automatic probe recognition, automatic
zeroing and a larger, more easily read LCD. It is a Multi-Mode thickness
gauge that has the ability to measure through painted or coated surfaces
and eliminate the thickness of the paint using a dual element style probe
in echo-echo mode. This instrument can measure with very high
resolution (0.01 mm or 0.001 inches) the thickness of metallic and
non-metallic materials such as steel, aluminum, titanium, plastics,
ceramics, glass and any other good ultrasonic wave conductor. The
DC-3000/DC-3020 accurately displays readings in either inches or
millimeters.
2. Technical Specifications
Measurement range
T-E : 0.65mm～400.00mm
E-E: 3.00mm～25.00mm
Resolution
0.01mm(0.001〞), 0.1mm (0.01〞)
Velocity range
1000m/s～9999m/s
Measurement rate
4 /s and 10/s in fast mode
Average mode
2 to 9 times average measurement
Limited setting
With Low-high indication and alarm
Measuring Units
mm / inch
Memory (DC3020)
Memory of 5000 readings with location number
Data output (DC3020)
USB to PC
Display
128×64 LCD with back light
Battery
2 x AAA Batteries
Operating
temperature
-20℃～+50℃
Measuring temp.
-20℃～+350℃(according to the probes)
Dimensions
116mm（L）×64mm（W）×27mm（H）
Weight
0.22kg (including batteries)

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3. Standard Delivery
-- Main Unit
-- Standard 5MHZ probe D5301
-- 75ML Couplant
-- Build-in calibration block
-- Cable (DC-3020)
--Carrying case
--Operating manual
--Certificate
4. Overview the Display Unit
1. LCD Screen
2. Key Pad
3. Battery Pack
4. Probe port
5. Standard Test Block
4
2
1
3
5

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5. Keypad Functions
Key
Function
- On/ Off Key
- Esc. Menu
Press this key to switch on or off .
Press this Key to Escape the Menu.
- Menu Key
- Confirm Key
Press This Key to enter the Menu.
Press this Key to confirm the selection.
- Return Key
- Storage Key
Press this key to previous menu (DC3000)
Press this key to store current data(DC3020)
- Up arrow Key
- Backlight Key
Achieve switch among the menu options in the
menu operation
Press this key to switch on or off the backlight
-Down arrow Key
- Calibration Key
Achieve switch among the menu options in the
menu operation.
Put the probe in the air, press this key to complete
the manual calibration. (Under the measurement)
- Left arrow key
Achieve switch among the menu options in the
menu operation. (under the measurement)
-Right arrow key
Achieve switch among the menu options in the
menu operation。(under the measurement)

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6. Display Screen
①Measurement Value
②Battery Life
③Measurement Mode
④Measuring Symbol
⑤Resolution
⑥Current Probe model
⑦Current memory location (DC3020)
⑧Current Velocity
⑨Gain setting
7. Preparation before measurement
【7.1】Preparation of the instrument
For the newly purchased instrument, please check the instrument and its
accessory according to the “3 standard delivery”. If user finds it is not the
same as the table listed, please contact the manufacture in time. If the
instrument is damaged, please do not use it and contact the manufacture
as soon as possible.
①
②
⑤
③
⑥
④
⑨
⑦
⑧

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【7.2】Selection of the Probe
Users can select the suitable probe according to the thickness of the
workpiece to be measured.
Type
Freq.
Meas. rang
Temp.
D5301
5.0MHz
E-E 3.0～25mm
T-E 1.44～200mm
<50℃
D5008
5.0MHz
0.8～300mm
<50℃
D5113
5.0MHz
2.0～200mm
<350℃
D7006
7.5MHz
0.65～50mm
<50℃
D7004
10.0MHz
0.65～20mm
<50℃
D2012
2.0MHz
2.0～400mm
<50℃
Type
Application
D5301
Used in the thickness measurement through the coating
(E-E)and normal measurement (T-E)
D5008
Used common in many measurements, for example when
the measuring surface is flat or with huge curvature, or the
thickness of the workpiece is large than 50mm.
D5113
Used in the thickness measurement when the temperature
is less than 350℃
D7006
Used in the measurement of thin wall thickness and small
curvature surface.
D7004
Used in the measurement of thin wall thickness and small
curvature surface.
D2012
Used in the measurement of coarse particles such as cast
iron.
【7.3】Treatment of the measured surface
When the surface to be measured is too rough or rusty heavily, please
perform the treatment according to the following methods:

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1．Clean the measured surface by grinding, polishing or filing, etc. or use
coupling agent with high viscosity for that.
2．Use coupling agents on the workpiece surface to be measured.
3．Take multiple measurements around the same testing point
8. Basic Gauge Operations
【8.1】Switch on
Select the probe and insert it into the probe socket and then press
to switch on the instrument, the screen displays: the Series No. and the
version number.
If you did not insert the probe before switching on the instrument, the
screen will prompt you that “Plug in the probe”, at this moment insert the
probe into the socket and waiting to go to the measuring status.
Note: Please use the standard provided probe, otherwise the instrument
will does not work normally and displaying “Error”.
【8.2】Probe Zero
The gauge does an automatic zeroing of the probe thus eliminating the
need for an on-block zero. And then the gauge came into the
measurement mode directly.
Notice: Please make sure the probe is not coupled to the test piece when
the gauge is first turned on and that there is no coolant on the end of the
probe. The probe should also be at the room temperature, clean without
any noticeable wear.
【8.3】Backlight
Press to turn on / off the backlight. (Under measurement state)

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【8.4】Measurement mode
There are 2 measuring modes provided, T-E mode and E-E mode .Users
can select different measuring modes according to their requirements and
measuring environments.
Press into measurement mode setting
Press or to select desired measurement mode
Press to confirm,
Press to Esc. Menu and into measurement state.
8.4.1.1 T-E Mode:
When the T-E mode is selected, all probes are available, and users can
select following measuring modes:
Standard Measurement:
Display the current value, satisfied with the normal measuring needs.
Minimum Measurement:
Among one measurement, display the point. It is suitable for testing the
curvature surface or needs to get the minimum value which is widely used
in the thickness measurement of pipeline.
Notice: it is not recommended to use this function when measuring cast
iron or alloy materials.
Difference mode: (DC-3020)
Display the accurate differential value between the measured value and
reference value set by the users, suitable for quality check to identifying
the qualified products, whose thickness is in the admissive error.

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Average mode: (DC-3020)
Provides the average value of 2 to 9 measured points and display it
suitable for testing the flat surface.
Limitation setting: (DC-3020)
Set the upper and lower limit, when the measured thickness exceeds the
preset limit, it will display and give alarm. This measurement mode is
more widely used than differential mode.
Scan:
It is available for measuring the thickness of test piece with high
temperature surface. The gauge will alarm for each fast measurement.
And will display the all measured thickness upon the complete
measurement finished.
8.4.1.2 E-E Mode:
When the E-E mode is selected, only probe D5301 is available. This
function allows you to make measurement between two consecutive back
wall echoes. Therefore, a good usage of the E-E option is for measuring
through coatings (Max. 1mm) to measure only the true metal thickness.
【8.5】Setting
8.5.1 Velocity rate
Sound velocity played an important role in measurement. Different
material is of different sound velocity. When the sound velocity is
incorrect, it will cause wrong measured results. There are two ways to
select the material's sound velocity, which are Velocity selection and
Velocity measurement.
8.5.1.1 Materials
The gauge gives the sound velocity of 9 different materials which can be
select by users. The 9 materials are: aluminum, titanium, steel, stainless
steel, glass, copper, cast iron, brass and polystyrene.

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Press into“ SETTING” – “Velocity rate”-“Material”
Press or to select material needed,
Press to confirm.
Notice: Velocities for 9 materials are just theoretic values. If users want to
get accurate measurements, please refer to “Velocity measurement”and
get the more accurate sound velocity.
8.5.1.2 Velocity input
Sound velocities of 9 materials is not satisfied with the requirements of
the users, there is a sound velocity table which give the sound velocity of
various materials in the appendix. Take this table to set correct sound
velocity reference.
Press key into the menu- “SETTING”-“Vel. Rate”-“Vel. input”,
Press or to move the arrow, press or to put the
new velocity,
Press to store this new Velocity.
Press or to select the place where you want to store,
Press to confirm.
8.5.1.3 Velocity measurement
Owing to workpiece that is made from various materials and even the
same material with different content and processing technology, the
sound velocity will be changed and this change will cause the measuring

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error. If the error is not enough to influence the measuring accuracy, it can
be neglect; otherwise it is necessary to get the accurate sound velocity of
the workpiece to be measured. The “velocity measurement” can be used,
the usage is as follows:
Select T-E mode, Velocity can be neglect, and directly measure the sample
which thickness is known.
Press key into the menu- “SETTING”-“Vel. Rate”-“Vel
measurement”,
Press or to move the arrow, press or to up and
down the value of velocity to determine the thickness as the same as the
value of sample that is measured,
Press to store this new velocity,
Press or to select location where you want to store,
Press to confirm.
8.5.1.4 Velocity storage
This function allows users to store 4 new velocities Rate.
8.5.2 Resolution
Users can select the displayed resolution. When selecting the high
accuracy, the workpiece surface to be measured should be smooth, for
the purpose of getting an accurate value.
Press key into “Resolution”,
Press or to set resolution and unit.

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1. 0.1 mm
2. 0.01 mm
3. 0.01 in
4. 0.001 in
Press key to enter/confirm
Notice: When probe D5113 and D2012 is selected, it is recommended to
set 0.1 mm and 0.01in.
8.5.3 Probe Calibration
It will cause error during the primary stage of usage and operating, this
caused by the following three aspects:
1. The probe itself or the temperature variation
2. System error caused by the match between instrument and probe.
3. Calculation error caused by the sound velocity set in the instrument is
different from that of the actual material.
In order to eliminate the possible error, please use following calibration
method:
Measure the test piece with known thickness and get a measurement
value,
Press into menu-“SETTING”-“PROBE CALIBRATION”,
Pressing or to adjust the measured value as the same as the
value of sample that is measured,
Press to confirm.

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【8.6】Memory (DC-3020)
Press into the menu, and then go into “Memory”, the screen will
display
1 Memory unit
2 Memory read
3 Delete memory
Press or into the selected item, press to confirm.
8.6.1 Memory unit
The gauge has a memory capacity of 5,200 test results. The memory
location was composed by alphabet A-Z and there are maximum 200 test
results in each alphabet. You can select an Alphabet freely for beginning to
store the value and the next number will be followed automatically.
Press into the menu- “Memory”-“Memory unit”,
Press or to select Alphabet A-Z which you want
Press to confirm.
After taking every measurement, press key to store the value with
a location number.
8.6.2 Memory Read
Press into the menu- “Memory”-“Memory Read” (Under the
measurement),

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Press and to select desired Alphabet. Then the desired group
of value can be readable by pressing and .
8.6.3 Delete Memory
Press into the menu- “Memory”- “Delete Memory” (Under the
measurement), Press and to select “Yes”or “No”. Press
again to confirm the delete.
8.6.4 Date Transfer
- Turn on the main unit and Keep the gauge under measurement interface,
-Then connect with PC with a cable in standard delivery. Meanwhile, new
disk is auto identified and remind users to open U disk
- When users open U disk, Alphabet with data shows on the screen;
otherwise not show here,
- Click an Alphabet users want to transfer, data is stored in .TXT; check the
data or copy to Word or Excel for further analysis.
【8.7】Function
Press into the menu - “FUNCTION”, screen shows:
1. Switch off mode
2. Gain setting
3. Language
4. Contrast
5. Default
6. Information

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Press or into the selected item, press to confirm.
8.7.1 Switch off
Auto shut down after 1 Min. 3 Min. 5 Min. can be selectable.
8.7.2 Gain setting
Press into the “Gain setting”, screen shows:
1. High
2. Medium
3. Low
4. Automatic
Press or to select desired item
Press to confirm.
Under user's measuring environment, both different materials and the
same material with different status will have different effects on the
accurate and stable measuring. So for different measured objects and
different measuring environment, users should adjust the work status of
the instrument to meet more measurements.
For many materials and measuring conditions, auto gain adjustment can
be used, but for some special measurement, adjusting the instrument's
working status is necessary. There are four different working modes: Auto,
Low, medium and high.
Auto: match different probe and meets almost all the measuring
requirements.
Low: Suitable for high scattering and small attenuation materials,

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Medium: Suitable for many measurements,
High: Suitable for high attenuation material
8.7.3Language
The gauge provides English, Spanish Portuguese and Czech language for
selection.
8.7.4 Contrast
User can adjust contrast of display.
8.7.5 Default
During the usage, when users can not ensure why the problems comes out
and with some questions on setting, he can use this function to make the
parameters to restore the factory status to eliminate any abnormal
because of the parameters setting.
8.7.6 Information
Screen shows the version number and Probe Number.
9. Measuring technology
【9.1】Measuring methods
The instrument provides many measuring methods.
1．Single point measuring method: use the probe to measure any point of
the workpiece to be measured and the displayed value is the thickness.
2．Two point measuring method: Perform two measurements on the
same point of the measured surface, in the second measurement, splitting
plane of the probe should be 90 degree, take the minimum as the
thickness value.
3．Multiple point measurement method: perform several measurements
in a circle about 30mm in diameter and take the minimum value as the
thickness value.

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4. Continuous measurement methods: apply the single point
measurement method, and take measurements continuously along the
designated route, the intervals should be less than 5mm, and take the
minimum value as the workpiece's thickness.
【9.2】Pipeline measurement method
During the measurement, make the probe's crosstalk interlayer plate be
perpendicular or parallel to the axial line of the pipeline. For a pipeline
with larger diameter, the probe's crosstalk interlayer plate should be
perpendicular to the axial line of the pipeline, but for pipeline with small
diameter, users should perform measurements making the crosstalk being
both parallel and perpendicular to the axial line of the pipeline and take
the minimum readout as the thickness value.
10. Maintenance and precautions
【10.1】Power check
When the power is low, the low battery indicator will appear, at this
moment users should replace the battery in time, or it will affect the
measuring accuracy. The backlight cannot be switched on for a long time,
because it is a big consumer of electricity.
Notice: if the instrument did not used for a long time, please take out of
the battery to avoid leakage to damage the instrument.
【10.2】Precautions
10.2.1 General precautions
The instrument should avoid strong vibration, do not let it in an
excessively humid environment, plug in or out the probe should hold the
jacket to avoid the core wire of the probe damaged.
10.2.2 Precaution during the measuring
①During the measurement, only the measuring icon appears and
displayed stable, it can be regarded as a good measurement.

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②If there are large quantity coupling agents attached on the measured
surface, when taking away the probe, it will cause error. so when the
measurement is completed, please move the probe away from the
measured surface quickly.
③If the probe wears out, it will cause the displayed value unstable, please
replace the probe.

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APPENDIX: SOUND VELOCITY MEASUREMENT CHART
Material
Sound Velocity
M/s
Inch/µS
Air
330
0.013
Aluminum
6300
0.250
Alumina Oxide
9900
0.390
Beryllium
12900
0.510
oron Carbide
11000
0.430
rass
4300
0.170
Cadmium
2800
0.110
Copper
4700
0.180
Glass(crown)
5300
0.210
Glycerin
1900
0.075
Gold
3200
0.130
Ice
4000
0.160
Inconel
5700
0.220
Iron
5900
0.230
Iron (cast)
4600
0.180
Lead
2200
0.085
Magnesium
5800
0.230
Mercury
1400
0.057
Molybdenum
6300
0.250
Polythylene
1900
0.070
Polystyrene
2400
0.0930
Polyurethane
1900
0.0700
Quartz
5800
0.230
Rubber, Butyl
1800
0.070
Silver
3600
0.140
Steel, Mild
5920
0.233
Steel, Stainless
5800
0.228
Teflon
1400
0.060
Tin
3300
0.130
Titanium
6100
0.240
Tungsten
5200
0.200
Uranium
3400
0.130
Water
1480
0.584
Zinc
4200
0.170