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MITECH MT150, User Manual

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MITECH MT150 User Manual Download Page 14

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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

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

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

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Summary of Contents for MT150

Page 1: ...Ultrasonic Thickness Gauge MT150 160 User s Manual MITECH CO LTD www mitech ndt com www ponpe com ...

Page 2: ...urfaces 8 4 Operation 8 4 1 Power On Off 8 4 2 Probe Zero 8 4 3 Sound Velocity Calibration 9 4 4 Making Measurements 10 4 5 Scan mode 11 4 6 Changing Resolution 11 4 7 Changing Units 11 4 8 Memory Management 12 4 9 Data Printing 12 4 10 Beep Mode 13 4 11 EL Backlight 13 4 12 Battery Information 13 4 13 Auto Power Off 13 4 14 System Reset 13 4 15 Connecting to a Computer 13 5 Servicing 13 6 Transpo...

Page 3: ... 300 mm in Steel Sound Velocity Range 1000 9999 m s Resolution MT150 0 1mm MT160 0 1mm 0 01mm Accuracy 0 5 Thickness 0 04 mm depends on materials and conditions Units Metric Imperial unit selectable Four measurements readings per second for single point measurement and ten per second for Scan Mode Memory for up to 20 files up to 99 values for each file of stored values Power Source Two AA size 1 5...

Page 4: ...al 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 th...

Page 5: ...een 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 Unit Current unit system MM or IN for thickness value M S or IN μS for sound velocity Battery Information Display the rest...

Page 6: ... 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 ...

Page 7: ...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 cente...

Page 8: ...orn 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 pressing the key The gaug...

Page 9: ...r to calibration will result in a multi material velocity calculation that may be different from the actual material velocity intended to be measured 4 3 1 Calibration to a known thickness 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 2 Apply couplant...

Page 10: ... changes from the value shown while the transducer was coupled repeat step 3 5 Press the key The MM or IN symbol should begin flashing 6 Use the key and the key to adjust the displayed thickness up or down until it matches the thickness of the sample piece 7 Press the key The display will flash 1OF2 Repeat steps 3 through 6 on the second calibration point 8 Press the key so that The M S or IN μS s...

Page 11: ... solely with the user of the instrument 4 5 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 measu...

Page 12: ...ements 3 Press the key on the desired file It will automatically clear the file and display DEL 4 Press the key at any time to exit the data logging functions and return to measurement mode 4 8 3 Viewing deleting stored record This function provides the user with the ability to view delete a record in a desired file previously saved in memory Following is the steps 1 Press the key to activate the ...

Page 13: ...hould be replaced Please take out the batteries when not working during a long period of time 4 13 Auto Power Off The instrument features an auto power off function designed to conserve battery life If the tool is idle for 5 minutes it will turn itself off While the voltage of the battery is too low this function will also work 4 14 System Reset Press down the key while powering on the instrument ...

Page 14: ...ss 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 w...

Page 15: ...efore 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 sa...

Page 16: ...tures 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 ...

Page 17: ...ing 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 maintenan...

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