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Ultrasonic Thickness Gauge
MT200
User’s Manual
MITECH CO., LTD.
www.mitech-ndt.com
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CONTENTS
1 Overview...................................................................................................................................................2
1.1 Product Specifications.........................................................................................................................2
1.2 Main Functions......................................................................................................................................2
1.3 Measuring Principle..............................................................................................................................2
1.4 Configuration......................................................................................................................................... 3
1.5 Operating Conditions........................................................................................................................... 3
2 Structure Feature................................................................................................................................... 3
2.1 Instrument Appearance....................................................................................................................... 3
2.2 Parts of the Main Body........................................................................................................................ 4
2.3 Main Screen...........................................................................................................................................4
2.4 Keypad Definition..................................................................................................................................5
3 Preparation.............................................................................................................................................. 5
3.1 Transducer Selection........................................................................................................................... 5
3.2 Condition and Preparation of Surfaces.............................................................................................6
4 Operation................................................................................................................................................. 7
4.1 Power On/Off.........................................................................................................................................7
4.2 Probe Set............................................................................................................................................... 7
4.3 Probe Zeroing........................................................................................................................................7
4.4 Sound Velocity...................................................................................................................................... 7
4.5 Making Measurements........................................................................................................................ 8
4.6 Two Point Calibration........................................................................................................................... 9
4.7 Scan mode.............................................................................................................................................9
4.8 Limit Set............................................................................................................................................... 10
4.9 Resolution............................................................................................................................................10
4.10 Memory Management..................................................................................................................... 10
4.11 System Set.........................................................................................................................................11
4.12 Product information.......................................................................................................................... 11
4.13 EL Backlight.......................................................................................................................................11
4.14 Auto Power Off..................................................................................................................................11
4.15 System Reset....................................................................................................................................11
4.16 Connecting to a Computer..............................................................................................................11
4.17 Battery Replacement....................................................................................................................... 12
5 Menu Operation....................................................................................................................................12
5.1 Enter the Main Menu......................................................................................................................... 12
5.2 Enter the Sub menu...........................................................................................................................12
5.3 Change the Parameter...................................................................................................................... 12
5.4 Numeric Digit Input.............................................................................................................................13
5.5 Save and Exit...................................................................................................................................... 13
5.6 Cancel and Exit...................................................................................................................................13
6 Servicing................................................................................................................................................ 13
7 Transport and Storage....................................................................................................................... 13
Appendix A Sound Velocities..............................................................................................................13
Appendix B Applications Notes..........................................................................................................14
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1 Overview
The model MT200 is a digital ultrasonic thickness gauge. Based on the same operating principles as
SONAR, the MT200 is capable of measuring the thickness of various materials with accuracy as high as
0.01 millimeters, or 0.001inches. It is suitable for a variety of metallic and non-metallic materials.
1.1 Product Specifications
Display：128×64 dot matrix LCD with EL backlight.
Measuring Range：0.75~300mm (in Steel, depending on the probe).
Sound Velocity Range:300~19999 m/s.
Resolution：0.1/0.01mm（selectable）.
Accuracy： ±（0.5%Thickness+0.01）mm
Units: Metric/Imperial unit selectable.
Four measurements readings per second in normal testing mode, and ten per second in Scan
Mode.
Memory: 100 files (up to 100 records for each file) .
Top and bottom limit can be pre-set. It will alarm automatically when the test result exceeds the limit.
Power Supply ： Two “AA” size, 1.5 volt alkaline batteries. 100 hours typical operating time (EL
backlight off).
Communication：USB2.0.
Case：Extruded aluminum body suitable for use under poor working conditions.
Outline dimensions：132H X 76.2W mm.
Weight：345g
1.2 Main Functions
Capable of performing measurements on a wide range of material, including metals, plastic,
ceramics, composites, epoxies, glass and other ultrasonic wave well-conductive materials.
Four transducer models are available for special applications, including coarse grain material and
high temperature applications.
Probe-Zero function.
Two-Point Calibration feature.
Scan mode feature.
Coupling status indicator showing the coupling status.
Battery information indicates the rest capacity of the battery.
Auto sleep and auto power off function to conserve battery life.
Optional PC software to process the memory records.
1.3 Measuring Principle
The digital ultrasonic thickness gauge determines the thickness of a part or structure by accurately
measuring the time required for a short ultrasonic pulse generated by a transducer to travel through the
thickness of the material, reflect from the back or inside surface, and be returned to the transducer. The
measured two-way transit time is divided by two to account for the down-and-back travel path, and then
multiplied by the velocity of sound in the material. The result is expressed in the well-known relationship:
2
tvH
Where：H－Thickness of the test piece.
v－Sound Velocity in the material.
t－The measured round-trip transit time.
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1.4 Configuration
Table 1-1
1.5 Operating Conditions
Operating Temperature: －20℃～＋60℃;
Storage Temperature：-30℃～＋70℃
Relative Humidity ≤90％；
The surrounding environment should avoid of vibration, strong magnetic field, corrosive medium
and heavy dust.
2 Structure Feature
2.1 Instrument Appearance
1 Main Body
2 Transducer
No.
Item
Quantity
Note
Standard Configuration
1
Main body
1
2
Transducer
1
Model: N05/90°
3
Couplant
1
4
Instrument Case
1
5
Operating Manual
1
6
Screwdriver
1
7
Alkaline battery
2
AA size
Optional Configuration
1
Transducer: N02
See Table3-1
2
Transducer: N07
3
Transducer: HT5
4
DataPro for Thickness
Gauge
1
PC Software
5
Communication Cable
1
LEMO to
USB-A
MT200
M iTe ch
2
1
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2.2 Parts of the Main Body
1 Communication Socket
2 Aluminum Case
3 Belt Hole
4 Battery Cover
5 Keypad
6 LCD Display
7 Socket of Transducer (no polarity)
8 Probe zero disc
9 Aluminum Case
10 Label
2.3 Measurement Screen
Battery Information: Capacity status of the battery.
Coupling Status: Indicate the coupling status. While the gauge is taking a measurement, the coupling
status should be on. If it is not on, the gauge is having difficulty achieving a stable measurement, and the
thickness value displayed will most likely be erroneous.
File Name: Show current file name.
Record Count: Total record count in current file.
Probe Model: Probe model setting in the instrument.
Sound Velocity: Sound velocity setting inside.
Thickness Reading：Thickness measurement result.
Unit：When the mm symbol is on, the instrument is displaying the thickness value in millimeters and the
sound velocity value in m/s. When the in symbol is on, the instrument is displaying the thickness value in
inches and the sound velocity value in inch/us.
Other Operating Hints:
8. Enter
MiTech Inc. Ltd
5. Switch Selection
6. Save/Delete
7. Exit
3
M iTe ch
4
8
2. Power On/Off
POWER: 2 X 1.5V
4. Probe Zero
OPERATION GUIDE
1. Plug in the transducer
3. Backlight On/Off
THICKNESS GAUGE
MT200
2
9
5
6
SN:
7
10
Probe Model
Record Count
File Name
Sound Velocity
Coupling Status
Thickness Reading
Battery Info
Units
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FILE: Current file selected；
RECORD：Memory records browsing；
PROBE： Transducer set；
VELOCITY： Change sound velocity;
CAL：Two-point calibration；
ZERO：Probe zero state
2.4 Keypad Definition
Turn the instrument on/off; Exit
/Cancel
Exit/Cancel
Turn on/off the EL backlight
Enter/Confirm
Probe Zero operation; Clear
files/records
Increase or scroll up
Switch selection among items
Decrease or scroll down
Save/Delete file/record
3 Preparation
3.1 Transducer Selection
The gauge is inherently capable of performing measurements on a wide range of materials, from various
metals to glass and plastics. Different types of material, however, will require the use of different
transducers. Choosing the correct transducer for a job is critical to being able to easily perform accurate
and reliable measurement. The following paragraphs highlight the important properties of transducers,
which should be considered when selecting a transducer for a specific job.
Generally speaking, the best transducer for a job is one that sends sufficient ultrasonic energy into the
material being measured such that a strong, stable echo is received by the gauge. Several factors affect
the strength of ultrasound as it travels. These are outlined below:
Initial Signal Strength. The stronger a signal is to begin with, the stronger its return echo will be. Initial
signal strength is largely a factor of the size of the ultrasound emitter in the transducer. A large emitting
area will send more energy into the material being measured than a small emitting area. Thus, a
so-called “1/2 inch” transducer will emit a stronger signal than a “1/4 inch” transducer.
Absorption and Scattering. As ultrasound travels through any material, it is partly absorbed. If the
material through which the sound travels has any grain structure, the sound waves will experience
scattering. Both of these effects reduce the strength of the waves, and thus, the gauge’s ability to detect
the returning echo. Higher frequency ultrasound is absorbed and scattered more than ultrasound of a
lower frequency. While it may seem that using a lower frequency transducer might be better in every
instance, low frequencies are less directional than high frequencies. Thus, a higher frequency
transducer would be a better choice for detecting the exact location of small pits or flaws in the material
being measured.
Geometry of the transducer. The physical constraints of the measuring environment sometimes
determine a transducer’s suitability for a given job. Some transducers may simply be too large to be
used in tightly confined areas. Also, the surface area available for contacting with the transducer may be
limited, requiring the use of a transducer with a small wearface. Measuring on a curved surface, such as
an engine cylinder wall, may require the use of a transducer with a matching curved wearface.
Temperature of the material. When it is necessary to measure on surfaces that are exceedingly hot, high
temperature transducers must be used. These transducers are built using special materials and
techniques that allow them to withstand high temperatures without damage. Additionally, care must be
taken when performing a “Probe-Zero” or “Calibration to Known Thickness” with a high temperature
transducer.
Selection of the proper transducer is often a matter of tradeoffs between various characteristics. It may
be necessary to experiment with a variety of transducers in order to find one that works well for a given
job.
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The transducer is the “business end” of the instrument. It transmits and receives ultrasonic sound waves
that the instrument uses to calculate the thickness of the material being measured. The transducer
connects to the instrument via the attached cable, and two coaxial connectors. When using transducers,
the orientation of the dual coaxial connectors is not critical: either plug may be fitted to either socket in
the instrument.
The transducer must be used correctly in order for the instrument to produce accurate, reliable
measurements. Below is a short description of the transducer, followed by instructions for its use.
Left figure is a bottom view of a typical transducer. The two semicircles of the wearface are visible, as is
the barrier separating them. One of the semicircles is responsible for conducting ultrasonic sound into
the material being measured, and the other semicircle is responsible for conducting the echoed sound
back into the transducer. When the transducer is placed against the material being measured, it is the
area directly beneath the center of the wearface that is being measured.
Right figure is a top view of a typical transducer. Press against the top with the thumb or index finger to
hold the transducer in place. Moderate pressure is sufficient, as it is only necessary to keep the
transducer stationary, and the wearface seated flat against the surface of the material being measured.
Table 3-1 Transducer Selection
Model
Freq
MHz
Diam
mm
Measuring Range
Lower limit
Description
N02
2.5
14
3.0mm～300.0mm（In
Steel）
40mm (in Gray Cast Iron
HT200)
20mm
For thick, highly
attenuating, or highly
scattering materials
N05
5
10
1.2mm～230.0mm（In
Steel）
Φ20mm×3
.0mm
Normal Measurement
N05
/90°
5
10
1.2mm～230.0mm（In
Steel）
Φ20mm×3
.0mm
Normal Measurement
N07
7
6
0.75mm～80.0mm
（In Steel）
Φ15mm×2
.0mm
For thin pipe wall or
small curvature pipe
wall measurement
HT5
5
12
3～200mm （In Steel）
30mm
For high temperature
(lower than 300℃)
measurement.
3.2 Condition and Preparation of Surfaces
In any ultrasonic measurement scenario, the shape and roughness of the test surface are of paramount
importance. Rough, uneven surfaces may limit the penetration of ultrasound through the material, and
result in unstable, and therefore unreliable, measurements. The surface being measured should be
clean, and free of any small particulate matter, rust, or scale. The presence of such obstructions will
prevent the transducer from seating properly against the surface. Often, a wire brush or scraper will be
helpful in cleaning surfaces. In more extreme cases, rotary sanders or grinding wheels may be used,
though care must be taken to prevent surface gouging, which will inhibit proper transducer coupling.
Extremely rough surfaces, such as the pebble-like finish of some cast iron, will prove most difficult to
measure. These kinds of surfaces act on the sound beam like frosted glass on light, the beam becomes
diffused and scattered in all directions.
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In addition to posing obstacles to measurement, rough surfaces contribute to excessive wear of the
transducer, particularly in situations where the transducer is “scrubbed” along the surface. Transducers
should be inspected on a regular basis, for signs of uneven wear of the wearface. If the wearface 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
transducer.
4 Operation
4.1 Power On/Off
The instrument is turned on by simply pressing key. When the gauge is initially turned on, the model
type, the manufacture information and the serial number will be displayed prior to entering into the main
screen.
The gauge is turned off by keeping pressing down key for over two seconds. The tool has a special
memory that retains all of its settings even when the power is off.
4.2 Probe Set
The model of the probe should be pre-set to the instrument before measuring operation. This enables
the user to select the probe model among supported transducers according to frequency and diameter
depending on application requirements. Use the following steps to select your transducer model：
1. On the main screen, press key multiple times to activate the 【Probe Model】tab.
2. Press or key to switch to the desired transducer model.
3. Press key to confirm the change. Or press key to cancel the change.
You can also change the probe model setting by menu operation. Please refer to chapter 5 for the help
of menu operation.
4.3 Probe Zeroing
The key is used to “zero” the instrument in much the same way that a mechanical micrometer is
zeroed. If the gauge is not zeroed correctly, all the measurements that the gauge makes may be in error
by some fixed value. When the instrument is “zeroed”, this fixed error value is measured and
automatically corrected for all subsequent measurements. The instrument may be “zeroed ” by
performing the following procedure.:
1. Plug the transducer into the instrument. Make sure that the connectors are fully engaged. Check
that the wearface of the transducer is clean and free of any debris.
2. Change the model of the probe set in the instrument to the model currently using.
3. Apply a single droplet of ultrasonic couplant to the surface of the attached probe-zero disc.
4. Press the transducer against the probe-zero disc, making sure that the transducer sits flat against
the surface.
5. While the transducer is firmly coupled to the probe disc, press on the keypad. The instrument
will display “ZERO XXX” on the display while it is calculating its zero point. "XXX" stands for the
probe model.
After the “ZERO XXX” characters disappear, remove the transducer from the probe disc.
At this point, the instrument has successfully calculated its internal error factor, and will compensate for
this value in any subsequent measurements. When performing a “probe zero”, the instrument will always
use the sound velocity value of the built-in probe-zero disc, even if some other velocity value has been
entered for making actual measurements. Though the instrument will remember the last “probe zero”
performed, it is generally a good idea to perform a “probe zero” whenever the gauge is turned on, as well
as any time a different transducer is used. This will ensure that the instrument is always correctly zeroed.
Press key while in probe zeroing state will stop current probe zeroing operation.
4.4 Sound Velocity
In order for the gauge to make accurate measurements, it must be set to the correct sound velocity for
the material being measured. Different types of material have different inherent sound velocities. If the
gauge is not set to the correct sound velocity, all of the measurements the gauge makes will be
erroneous by some fixed percentage. The One-Point calibration is the simplest and most commonly
used calibration procedure optimizing linearity over large ranges. The Two-point calibration allows for
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greater accuracy over small ranges by calculating the probe zero and velocity.
Note: One and Two point calibrations must be performed on material with the paint or coating
removed. Failure to remove the paint or coating prior to calibration will result in a multi material
velocity calculation that may be different from the actual material velocity intended to be
measured.
4.4.1 Calibration to a known thickness
One point calibration applies to this situation. Note: This procedure requires a sample piece of the
specific material to be measured, the exact thickness of which is known, e.g. from having been
measured by some other means.
1 Perform a Probe-Zero on the attached probe-zero disc.
2 Apply couplant to the sample piece.
3 Press the transducer against the sample piece, making sure that the transducer sits flat against
the surface of the sample. The display should show some thickness value, and the coupling status
indicator should appear.
4 Having achieved a stable reading, remove the transducer. If the displayed thickness changes
from the value shown while the transducer was coupled, repeat step 3.
5 Press or key to trigger the calibration process. Use and keys to adjust the
displayed thickness up or down, until it matches the thickness of the sample piece.
6 Press key to confirm the adjustment. The gauge is now displaying the calibrated sound
velocity value it has calculated based on the thickness value that was entered. The gauge is now ready
to perform measurements.
4.4.2 Calibration to a known velocity
Note: This procedure requires that the operator knows the sound velocity of the material to be
measured. A list of common materials and their sound velocities can be found in Appendix A of
this manual.
1 On the main screen, press key multiple times to highlight the sound velocity item.
2 Press or key to open the 【Set Velocity】 dialog.
3 Press and keys to adjust the sound velocity value, until it matches the sound
velocity of the material to be measured. Or press key to select among the preset commonly using
velocities.
4 Press key to confirm the change. Or press key to cancel the change. The gauge is now
ready to perform measurements.
Another method to set the instrument with a known sound velocity is as following:
1 Open 【Test Settings】－>【Velocity Set】submenu, press to enter the sound velocity set
dialog.
2 Use and keys to adjust the sound velocity value up or down, until it matches the
sound velocity of the material to be measured. Or press key to select among the preset commonly
using velocities.
3 Press key to confirm the change. Or press key to cancel the change.
To achieve the most accurate measurements possible, it is generally advisable to always calibrate the
gauge to a sample piece of known thickness. Material composition (and thus, its sound velocity)
sometimes varies from lot to lot and from manufacturer to manufacturer. Calibration to a sample of
known thickness will ensure that the gauge is set as closely as possible to the sound velocity of the
material to be measured.
4.5 Making Measurements
When the tool is displaying thickness measurements, the display will hold the last value measured, until
a new measurement is made.
In order for the transducer to do its job, there must be no air gaps between the wear-face and the surface
of the material being measured. This is accomplished with the use of a “coupling” fluid, commonly called
“couplant”. This fluid serves to “couple”, or transfer, the ultrasonic sound waves from the transducer, into
the material, and back again. Before attempting to make a measurement, a small amount of couplant
should be applied to the surface of the material being measured. Typically, a single droplet of couplant is
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sufficient.
After applying couplant, press the transducer (wearface down) firmly against the area to be measured.
The coupling status indicator should appear, and a number should appear in the display. If the
instrument has been properly “zeroed” and set to the correct sound velocity, the number in the display
will indicate the actual thickness of the material directly beneath the transducer.
If the coupling status indicator does not appear, or the numbers on the display seem erratic, firstly check
to make sure that there is an adequate film of couplant beneath the transducer, and that the transducer
is seated flat against the material. If the condition persists, it may be necessary to select a different
transducer (size or frequency) for the material being measured.
While the transducer is in contact with the material that is being measured, the instrument will perform
four measurements every second, updating its display as it does so. When the transducer is removed
from the surface, the display will hold the last measurement made.
Notes：
Occasionally, a small film of couplant will be drawn out between the transducer and the surface
as the transducer is removed. When this happens, the gauge may perform a measurement
through this couplant film, resulting in a measurement that is larger or smaller than it should be.
This phenomenon is obvious when one thickness value is observed while the transducer is in
place, and another value is observed after the transducer is removed. In addition, measurements
through very thick paint or coatings may result in the paint or coating being measured rather
than the actual material intended. The responsibility for proper use of the instrument, and
recognition of these types of phenomenon, rest solely with the user of the instrument.
4.6 Two Point Calibration
Note: This procedure requires that the operator has two known thickness points on the test piece
or two test pieces that are representative of the range to be measured. Following are the steps of
Two-Point Calibration,
1. Perform a Probe-Zero on the built-in probe-zero disc.
2. Apply couplant to the sample piece. Press the transducer against the sample piece, at the
first/second calibration point, making sure that the transducer sits flat against the surface of the
sample. The display should show some (probably incorrect) thickness value, and the coupling
status indicator should appear. Having achieved a stable reading, remove the transducer. If the
displayed thickness changes from the value shown while the transducer was coupled, repeat this
operation.
3. Press or key to open the thickness calibration dialog. Use and keys to adjust
the thickness value up or down, until it matches the nominal thickness of the sample piece at that
point.
4. Press key to confirm and continue the calibration to the next point. You many notice the "CAL"
characters, which indicating the process of Two-Point calibration, displaying in the sound velocity
area of the main screen.
5. Repeat steps 2 through 3 for the calibration of the second test point.
6. Finally press to complete the calibration. It will automatically calculate the sound velocity of the
sample material, which will be applied in subsequent measurement.
The gauge is now ready to perform measurements within this range.
4.7 Scan mode
While the gauge excels at making single point measurements, it is sometimes desirable to examine a
larger region, searching for the thinnest point. The gauge includes a feature, called Scan Mode, which
allows it to do just that.
In normal operation, the gauge performs and displays four measurements every second, which is quite
adequate for single measurements. In Scan Mode, however, the gauge performs ten measurements
every second, and displays the readings while scanning. While the transducer is in contact with the
material being measured, the gauge is keeping track of the lowest measurement it finds. The transducer
may be “scrubbed” across a surface, and any brief interruptions in the signal will be ignored. When the
transducer is removed from the material being scanned, the minimum and maximum measurement will
be retained.
Go to 【Test Settings】－>【Scan Mode】menu, press to toggle between 【On】and【Off】of the
Scan Mode function.
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While in scan mode, press key will clear recent tracking records.
4.8 Limit Set
The Limit feature of the gauge allows the user to set an audible parameter when taking measurements. If
a measurement is beyond the limit range, set by the user, the beeper will sound, if enabled. This
improves the speed and efficiency of the inspection process by eliminating constant viewing of the actual
reading displayed. The following section outline how to enable and set up this feature:
1. Open 【Test Settings】->【Top Limit】.
2. Use and keys to change the top limit value to the desired values.
3. Press key to confirm the change and return to the previous screen, or press key to cancel
the change.
The operation of setting 【Bottom Limit】follows the same way. If the bottom limit is larger than the upper
limit, it will prompts an error information.
4.9 Resolution
The gauge has selectable display resolution, which is 0.1mm and 0.01mm.
Open 【Test Setting】->【Resolution】, and select the resolution between the two options.
4.10 Memory Management
4.10.1 Storing a Record
The non-volatile memory space of the gauge is divided into many sections, which are called as files.
There are 100 files (F00-F99) that can be used to store the measurement values inside the gauge. At
most 100 records can be stored to each file. The following procedures outline this storing process:
1 Perform a measurement on the workpiece.
After a new measurement reading appears, press key to save the measurement value to current file.
4.10.2 Managing the Files/Records
On the main screen, press key to highlight the【File Name】item. Then press or key to open
the browsing file dialog, where the following operations can be applied,
Press will clear the highlighted file.
Press will clear all the files.
Press or will set the highlighted file as current file (marked with a '*' prefix), which will be
used as the target file in subsequent storing operations.
Press will exit from the dialog.
On the main screen, press key multiple times until the 【Record Count】 item is highlighted. Then
press or key to open the browsing records dialog, where the following operations can be
applied,
Press will delete the highlighted record.
Press will delete all the records of in the specified file.
Press or will exit from the dialog.
Another way to browse/manage the stored files/records is by menu operations. Move to the 【Memory
Manager】menu item, then press to open the files managing dialog as following,
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4.11 System Set
From the main menu, press on the 【System Configuration】item and open its submenus.
1. When 【Key Sound】 is set to 【On】，the buzzer would make a short hoot while press the key each
time.
2. When 【Warn Sound】 is set to 【On】, if the measured value exceeds the limit range, the buzzer
would make a long hoot.
3. LCD Contrast: In the 【LCD Contrast】dialog, press to enhance the contrast, or press to
weaken the contrast. Finally press to confirm the change, or press to cancel the change.
4. Unit System. When the 【Unit System】item is highlighted, press key to switch between Imperial
and Metric unit system.
5. Date/Time Set. For a correct documentation, make sure to set the correct date and time for the
gauge. Once set, the internal clock of the instrument will maintain the current date and time.
6. Language Selection. Two languages optional: Chinese and English.
4.12 Product information
This 【product information】 dialog will display some specific information about the main unit. Some of
the information would change with the firmware upgrading.
4.13 EL Backlight
With the background light, it is convenient to work under dark conditions. Press to switch on/off the
background light at any moment as you need after turning on. Since the EL light will consume much
power, switch it on only when necessary.
4.14 Auto Power Off
The instrument features an auto power off function designed to conserve battery life. If the tool is idle,
without any key operation or measurement, over a specified period of time, it will turn itself off. If the
batteries is almost exhausted, it will shut off immediately.
Four options for this function are available: 2 Minutes, 5 Minutes, 10 Minutes and Disable.
4.15 System Reset
Press down the key while turning on the instrument, or trigger the 【System Reset】function through
menu operation, will restore factory defaults. All the memory data will be cleared during system reset.
The only time this might possibly helpful is if the parameter in the gauge was somehow corrupted.
4.16 Connecting to a Computer
The gauge is equipped with an USB2.0 full-speed communication port. Using the accessory cable, the
gauge has the ability to connect to a computer. Records data stored in the memory of the gauge can be
In the files managing dialog,
Press will clear the highlighted file.
Press will clear all the files.
Press will set the highlighted file as current
file (marked with a '*' icon).
Press will open the records managing
dialog.
Files
In the records managing dialog,
Press will delete the highlighted record.
Press will delete all the records of in the
specified file.
Press or will exit from the dialog
Records
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transferred to the computer through the USB port. Detailed information of the communication software
and its usage refer to the software manual.
4.17 Battery Replacement
Two AA size alkaline batteries are needed as the power source. After several hours’ usage of the preset
batteries, the battery symbol on the screen will be shown as . The more of dark part indicates the
more close to full. When the battery capacity runs out, the battery symbol will be shown as .
When this occurs, the batteries should be replaced.
Refer to the sketch below during battery replacement. Please pay much attention to the polarity of the
battery.
+
-
+
-
Cathode
Anode
M iT ec
MT200
Procedure:
1 Turn Off the instrument,
2 Screw off the cover of the battery and take out the two batteries,
3 Insert the new batteries,
4 Replug the battery cover,
5 Turn on the instrument to check.
Please take out the batteries when not working during a long period of time. Suggest to replace the
batteries when the battery capacity indicator shows less than 10% capacity.
5 Menu Operation
Both presetting system parameters and the additional function could come true by menu operation. At
the main screen, press key into the main menu.
5.1 Enter the Main Menu
To enter the main menu, just press key to activate the menu items tab while on the main screen. To
return back to the previous screen, press key.
5.2 Enter the Sub menu
Press key to enter the submenu screen while the submenu item is selected.
5.3 Change the Parameter
Press key to change the value of a parameter while the item is selected on the parameter set
The Main Display Interface
Test Settings
Memory Manager
System Config.
Product Info
System Reset
Probe Set
Velocity Set
Scan Mode
Bottom Limit
Top Limit
Resolution
Key Sound
Warn Sound
LCD Contrast
Auto Poweroff
Unit System
Date/Time Set
Language
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screen.
5.4 Numeric Digit Input
Press key multiple times to highlight the numeric digit to be changed; Press / key to
increase/decrease numeric values on the display until it matches the desired value.
5.5 Save and Exit
Press key to confirm the modifying and return back to the previous screen.
5.6 Cancel and Exit
Press key to cancel the change and return back to the previous screen.
6 Servicing
When the hardness tester appears some other abnormal phenomena, please do not dismantle or adjust
any fixedly assembled parts. Fill in and present the warranty card to us. The warranty service can be
carried on.
7 Transport and Storage
1) Keep it away from vibration, strong magnetic field, corrosive medium, dumpiness and dust. Storage
in ordinary temperature.
2) With original packing, transport is allowed on the third grade highway.
Appendix A Sound Velocities
Material
Sound Velocity
in/µs
m/s
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
0.109
2760
Epoxy resin
0.100
2540
Ice
0.157
3988
Nickel
0.222
5639
Plexiglass
0.106
2692
Polystyrene
0.092
2337
Porcelain
0.230
5842
PVC
0.094
2388
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Quartz glass
0.222
5639
Rubber, vulcanized
0.091
2311
Teflon
0.056
1422
Water
0.058
1473
Appendix B Applications Notes
Measuring pipe and tubing.
When measuring a piece of pipe to determine the thickness of the pipe wall, orientation of the
transducers is important. If the diameter of the pipe is larger than approximately 4 inches, measurements
should be made with the transducer oriented so that the gap in the wearface is perpendicular (at right
angle) to the long axis of the pipe. For smaller pipe diameters, two measurements should be performed,
one with the wearface gap perpendicular, another with the gap parallel to the long axis of the pipe. The
smaller of the two displayed values should then be taken as the thickness at that point.
Measuring hot surfaces
The velocity of sound through a substance is dependant upon its temperature. As materials heat up, the
velocity of sound through them decreases. In most applications with surface temperatures less than
about 100℃, no special procedures must be observed. At temperatures above this point, the change in
sound velocity of the material being measured starts to have a noticeable effect upon ultrasonic
measurement. At such elevated temperatures, it is recommended that the user perform a calibration
procedure on a sample piece of known thickness, which is at or near the temperature of the material to
be measured. This will allow the gauge to correctly calculate the velocity of sound through the hot
material.
When performing measurements on hot surfaces, it may also be necessary to use a specially
constructed high-temperature transducer. These transducers are built using materials which can
withstand high temperatures. Even so, it is recommended that the probe be left in contact with the
surface for as short a time as needed to acquire a stable measurement. While the transducer is in
contact with a hot surface, it will begin to heat up, and through thermal expansion and other effects, may
begin to adversely affect the accuracy of measurements.
Measuring laminated materials.
Laminated materials are unique in that their density (and therefore sound-velocity) may vary
considerably from one piece to another. Some laminated materials may even exhibit noticeable changes
in sound-velocity across a single surface. The only way to reliably measure such materials is by
performing a calibration procedure on a sample piece of known thickness. Ideally, this sample material
should be a part of the same piece being measured, or at least from the same lamination batch. By
calibrating to each test piece individually, the effects of variation of sound-velocity will be minimized.
An additional important consideration when measuring laminates, is that any included air gaps or
pockets will cause an early reflection of the ultrasound beam. This effect will be noticed as a sudden
decrease in thickness in an otherwise regular surface. While this may impede accurate measurement of
total material thickness, it does provide the user with positive indication of air gaps in the laminate.
Suitability of materials
Ultrasonic thickness measurements rely on passing a sound wave through the material being measured.
Not all materials are good at transmitting sound. Ultrasonic thickness measurement is practical in a wide
variety of materials including metals, plastics, and glass. Materials that are difficult include some cast
materials, concrete, wood, fiberglass, and some rubber.
Couplants
All ultrasonic applications require some medium to couple the sound from the transducer to the test
piece. Typically a high viscosity liquid is used as the medium. The sound used in ultrasonic thickness
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measurement does not travel through air efficiently.
A wide variety of couplant materials may be used in ultrasonic gauging. Propylene glycol is suitable for
most applications. In difficult applications where maximum transfer of sound energy is required, glycerin
is recommended. However, on some metals glycerin can promote corrosion by means of water
absorption and thus may be undesirable. Other suitable couplants for measurements at normal
temperatures may include water, various oils and greases, gels, and silicone fluids. Measurements at
elevated temperatures will require specially formulated high temperature couplants.
Inherent in ultrasonic thickness measurement is the possibility that the instrument will use the second
rather than the first echo from the back surface of the material being measured while in standard
pulse-echo mode. This may result in a thickness reading that is TWICE what it should be. The
Responsibility for proper use of the instrument and recognition of these types of phenomenons rest
solely with the user of the instrument.
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User Notes
Warranty：
The product is guaranteed for one year since purchased. Log www.mitech-ndt.com or follow our
company official public platform to register for maintenance. Please fill the blanks as required, if the
product is not registered for maintenance, it will follow the date of manufacturer.
When applying for maintenance, please visit our official website, www.mitech-ndt.com or official
accounts, submit “online reporting to repair” sheet.
In accordance with the international relevant regulations, the following are not within the scope of free
warranty,
Damage caused by man-made or improper keeping;
Self-dismantle or non-special repair shop dismantle;
Do not follow the requirement of service registration or warranty expired;
Consumable parts.
Service promise
：
MITECH users have lifelong maintenance service
Free maintenance, inspection, software upgrade and etc.
Add: Room E506B, YingChuangDongLi Park, 1# of ShangDi East Road,
Haidian District, Beijing, China
Post code: 100085
Website: www.mitech-ndt.com
Email: mvip@mitech-ndt.com
Tel: 0086-10-58858658
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