MITECH mt180, mt190 User Manual
Mul-ti Mode
Ultrasonic Thickness Gauge
MT180/190
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...................................................................................................................................2
1.5 Operating Conditions..................................................................................................................... 3
2 Structure Feature...............................................................................................................................3
2.1 Main Screen.................................................................................................................................... 3
2.2 Keypad Definitions......................................................................................................................... 4
3 Preparation..........................................................................................................................................4
3.1 Transducer Selection.....................................................................................................................4
3.2 Condition and Preparation of Surfaces...................................................................................... 6
4 Operation............................................................................................................................................. 6
4.1 Power On/Off.................................................................................................................................. 6
4.2 Setting the Measurement Mode.................................................................................................. 6
4.3 Perform Probe Zero....................................................................................................................... 6
4.4 Sound Velocity Calibration........................................................................................................... 7
4.5 Making Measurements.................................................................................................................. 8
4.6 Scan mode...................................................................................................................................... 9
4.7 Changing Resolution..................................................................................................................... 9
4.8 Changing Units............................................................................................................................... 9
4.9 Memory Management................................................................................................................... 9
4.10 EL Backlight................................................................................................................................10
4.11 Battery Information.................................................................................................................... 10
4.12 Auto Power Off........................................................................................................................... 10
4.13 System Reset............................................................................................................................. 10
4.14 Connecting to a Computer.......................................................................................................10
5 Servicing............................................................................................................................................10
6 Transport and Storage...................................................................................................................10
Appendix A Sound Velocities.......................................................................................................... 10
Appendix B Applications Notes......................................................................................................11
User Notes............................................................................................................................................ 14
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1 Overview
The model MT180/MT190 is a multi-mode ultrasonic thickness gauge. Based on the same operating
principles as SONAR, the instrument is capable of measuring the thickness of various materials with
accuracy as high as 0.1/0.01 millimeters.
The multi-mode feature of the gauge allows the user to toggle between pulse-echo mode (flaw and pit
detection), and echo-echo mode(eliminate paint or coating thickness).
1.1 Product Specifications
Display：4.5 digits LCD with EL backlight.
Range：Pulse-Echo mode: (0.65～600)mm (in Steel).
Echo-Echo mode: (3～30)mm for MT180, (3～60)mm for MT190.
Sound Velocity Range: (1000~9999) m/s.
Resolution： 0.1mm/0.01mm
Accuracy： ±（0.5%Thickness+0.01）mm, depends on materials and conditions
Storage：Memory for up to 20 files (up to 99 values for each file) of stored values.
Power Source ：Two “AA” size, 1.5 Volt alkaline batteries. 100 hours typical operating time (EL
backlight off).
Communication：USB1.1.
Outline dimensions：150mm×74mm×32 mm.
Weight：245g
1.2 Main Functions
Multi-mode: Pulse-Echo mode and Echo-Echo mode.
Capable of performing measurements on a wide range of material, including metals, plastic,
ceramics, composites, epoxies, glass and other ultrasonic wave well-conductive materials.
Transducer models are available for special application, including for coarse grain material and high
temperature applications.
Probe-Zero function, Sound-Velocity-Calibration function
Two-Point Calibration function.
Single point mode and Scan mode. Seven measurements readings per second in single point mode,
and sixteen per second in Scan Mode.
Coupling status indicator showing the coupling status.
Units: Metric/Imperial unit selectable.
Battery information indicates the rest capacity of the battery.
Auto sleep and auto power off function to conserve battery life.
Optional software to process the memory data on the PC.
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.
1.4 Configuration
Table 1-1
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No
Item
Qty.
Note
Standard Configuration
1
Main body
1
2
Probe P5EE
1
3
Couplant
1
4
Instrument Case
1
5
Operating Manual
1
6
Alkaline battery
2
AA size
Optional Configuration
1
Probe N05 (5MHz)
See Table3-1
2
Probe N05/90°(5MHz)
3
Probe N07(7MHz)
4
Probe HT5(5MHz)
5
DataPro Software
1
6
Communication Cable
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
1 The main body 2 Keypad 3 LCD display
4 Pulser socket 5 Receiver socket 6 Probe zero disc
7 Communication port 8 Label 9 Battery cover
10 Probe
2.1 Main Screen
POWER: 2 X 1.5V
SN:
ULTRASONIC
THICKNESS GAUGE
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1, Coupling Status: Indicate the coupling status. While the gauge is taking a measurement, the
coupling status should be on. If it is not on or not stable, the gauge is having difficulty achieving a stable
measurement, and the thickness value displayed will most likely be erroneous.
2, Unit: Current unit system. MM or IN for thickness value. M/S or IN/μS for sound velocity.
3, Battery Information: Display the rest capacity of the battery.
4, Information Display: Displays the measured thickness value, the sound velocity and shows hints of
current operation.
2.2 Keypad Definitions
Turn the instrument on/off
Sound velocity calibration
Turn on/off the EL backlight
Enter
Probe-Zero operation
Plus;
Turn on/off Scan mode
Unit switch between Metric
and Imperial system
Minus;
Switch between pulse-echo and
echo-echo mode
Data Save or Data Delete
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
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