MITECH MT660, MT600 User Manual

Mul-ti Mode

www.ponpe.com

Ultrasonic Thickness

Gauge
MT660

User’s Manual

MITECH CO., LTD.

www.mitech-ndt.com

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CONTENTS

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1 Overview...................................................................................................................................................... 4

1.1 Product Features............................................................................................................................... 4

1.2 Measuring Principle...........................................................................................................................4

1.3 Specifications..................................................................................................................................... 4

1.4 Transducer Technical Parameters..................................................................................................5

1.5 Configuration...................................................................................................................................... 6

1.6 Operating Conditions........................................................................................................................ 6

2 Structure Feature.......................................................................................................................................6

2.1 Main Screen....................................................................................................................................... 7

2.2 Keypad Definitions............................................................................................................................ 7

3 Test Preparation.........................................................................................................................................8

3.1 Transducer Selection........................................................................................................................ 8

3.2 Condition and Preparation of Surfaces..........................................................................................9

4 Startup.......................................................................................................................................................... 9

4.1 Power Supply..................................................................................................................................... 9

4.2 Connecting the Probe.....................................................................................................................10

4.3 Starting the Instrument................................................................................................................... 10

4.4 Configuration of the Standby Settings.........................................................................................10

5 Operations.................................................................................................................................................11

5.1 Setting the Work Mode................................................................................................................... 11

5.2 Probe Selection................................................................................................................................11

5.3 Perform Probe Zero........................................................................................................................ 11

5.4 Sound Velocity Calibration.............................................................................................................12

5.5 Making Measurements................................................................................................................... 13

5.6 View Mode Setting.......................................................................................................................... 14

5.7 Nominal Thickness Setting............................................................................................................ 15

5.8 Limit Setting......................................................................................................................................15

5.9 Changing Resolution...................................................................................................................... 16

5.10 Memory Management.................................................................................................................. 16

5.11 Key Sound Setting........................................................................................................................ 17

5.12 Warn Sound Setting......................................................................................................................17

5.13 LCD Brightness Setting................................................................................................................17

5.14 Display Standby Setting...............................................................................................................18

5.15 Auto Poweroff Setting................................................................................................................... 18

5.16 Changing Unit System................................................................................................................. 18

5.17 Date and Time setting.................................................................................................................. 18

5.18 Language Setting.......................................................................................................................... 19

5.19 Product Information...................................................................................................................... 19

5.20 Reset System................................................................................................................................ 19

5.21 Print via Bluetooth.........................................................................................................................19

5.22 USB Communication.................................................................................................................... 20

6. Measuring Technologies......................................................................................................................21

6.1 Measuring Method.......................................................................................................................... 21

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6.2 Wall Measurement.......................................................................................................................... 21

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7 Servicing....................................................................................................................................................21

8 Transport and Storage...........................................................................................................................21

Appendix A Sound Velocities..................................................................................................................22

Appendix B Applications Notes..............................................................................................................23

User Notes.................................................................................................................................................... 25

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1 Overview

 Multi-mode: Pulse-Echo mode (P-E mode) and Echo-Echo mode (E-E mode). In Echo-Echo



Wide measuring range ： Pulse-Echo mode: (0.65 ～ 600)mm (in Steel). Echo-Echo mode:

 V-Path correction to compensate the nonlinearity of the probe

 Color TFT display (320×240 TFT LCD) with adjustable backlight, allow the user to work at

 Non-volatile memory can store 100 groups of test thickness. One hundred records max for

 Two AA size alkaline batteries as the power source. Continuous operating period of no less

 With internal Bluetooth module, it can print test report wirelessly.

 USB 2.0 communication port. Online transfer of the measured data to PC via USB.

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 Multi-mode: Pulse-Echo mode and Echo-Echo mode.

 Capable of performing measurements on a wide range of material, including metals, plastic,

 Special transducer models are available for special application, including for coarse grain

 Probe-Zero function, Sound-Velocity-Calibration function

 Two-Point Calibration function.

 Three working modes: normal mode, scan mode and diff mode.

 Coupling status indicator showing the coupling status.

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The model MT660 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 Features

mode, it can test the wall thickness eliminating paint or coating thickness.

(2.5～100)mm

worksites with low visibility.

each group.

than 100 hours (default brightness setting). Display Standby and Auto Power Off functions to

save power.

1.2 Measuring Principle

The 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:

Where： H－Thickness of the test piece.

v－Sound Velocity in the material.
t－The measured round-trip transit time.

1.3 Specifications

ceramics, composites, epoxies, glass and other ultrasonic wave well-conductive materials.

material and high temperature applications.

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 Units: Metric and Imperial unit selectable.

 Battery information indicates the rest capacity of the battery.

 Auto sleep and auto power off function to conserve battery life.

 USB2.0 communication port

 Bluetooth support.

 Size: 120mm×67mm×31mm

 Weight: 295g

1.4 Transducer Technical Parameters

Model

Freq
MHz

ΦmmMeasuring

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

N05510

1mm～

600.0mm

（In Steel）

Φ20mm×

3.0mm

Normal

Measurement

N05
/90°

5

10

1mm～

600.0mm

（In Steel）

Φ20mm×

3.0mm

Normal

Measurement

N0776

0.65mm～

200.0mm

（In Steel）

Φ15mm×

2.0mm

For thin pipe wall

or small curvature

pipe wall

measurement

HT5512

1～600mm

（In Steel）

30mm

For high

temperature

(lower than 300℃)

measurement.

P5EE

5

10

P-E: 2~600mm
E-E: 3~100mm

Φ20mm×

3.0mm

Normal

Measurement

and

trough-coating

thickness testing

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Table 1.1 Transducer Technical Parameters

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1.5 Configuration

No

Item

Qty.

Note

Standar
d Config.

1

Main body

1

2

Probe P5EE(5MHz)

1

3

Couplant

1

4

Instrument Case

1

5

Operating manual

1

6

Alkaline battery

2

AA size

Optional
Config.

7

Probe N02 (2.5MHz)

8

Probe N05/90°(5MHz)

See Table1.1

9

Probe N05 (5MHz)

10

Probe N07(7MHz)

11

Probe HT5(5MHz)

12

Data Pro Software

1

13

USB Cable

1

14

Portable Bluetooth
thermal printer

1

Including
charger,
manual and
other parts.

1. The Main Body 2. Keypad 3. TFT display

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Table 1.2 Instrument Configurations

1.6 Operating Conditions

Operating Temperature: 0℃～＋50℃;
Storage Temperature：-20℃～＋70℃
Relative Humidity ≤80％；

The surrounding environment should avoid of vibration, strong magnetic field, corrosive medium

and heavy dust.

2 Structure Feature

4. Battery cover 5.P/R socket 6. Probe zero disc 7.Bluetooth status 8.USB interface 9.

Probe

10. Label

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2.1 Main Screen

The instrument is designed to
give the user quick access to
all of the instrument’s
functions. Its easy-to-use menu
system allows any function to
be accessed with several key
presses.

Function keys to select
accordingly the function on the
screen. In the following
sections of this manual, they
are referred to as F1, F2 and
F3 from left to right.

Turn the instrument

on/off , or Cancel

Probe-Zero

operation

Plus or scroll up

Confirm/Enter

Minus or scroll down

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Mode: "E-E" indicating the instrument work in the Echo-Echo mode; "P–E” indicating it work in the

Pulse-Echo mode;

Probe: Probe selection

Velocity: Sound velocity

Battery: Indicating the rest capacity of the battery.

Thickness: Last test result

Unit: mm or inch

Diff value: Differential result when working in diff mode.

Time: System time

Status: USB and Bluetooth communication status

Operation: Indicate the information about the ongoing operation;

Record: Shows selected data group name and record count.

Couple: Indicate the coupling status

Nominal thickness: the nominal thickness of the test piece

2.2 Keypad Definitions

The red LED on the keyboard is used to indicate the Bluetooth communication status as described

in the following table:

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Bluetooth role

LED status

Bluetooth status

Host mode

Fast glittering (150 ms

on, 150 ms turn off)

Searching and

connecting

Fast glittering 5 times

and then turn off after 2

seconds

connecting

Always on

Connected

Slave mode

Slow glittering (800 ms

on, 800 ms turn off)

connecting

Always on

Connected

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3 Test 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.