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Table of Contents
1. Introduction ............................................................................................................................... 6
1.1 Important Notes on Wall Thickness Measurement ................................................................ 6
Prerequisites for the use of ultrasonic wall thickness gauges ................ Fout! Bladwijzer niet
1.1.2 Limitations to Ultrasonic Testing.................................................................................... 7
1.1.2.1 Ultrasonic Wall Thickness Testing ........................................................................... 7
1.1.2.2 Influence of the Material to be tested ....................................................................... 8
1.1.2.3 Influence of Changes in Temperature ...................................................................... 8
1.1.2.4 Measurement of the Residual Wall Thickness ......................................................... 8
1.1.2.5 How to use the Couplant ......................................................................................... 8
1.1.2.6 Duplication of Reading ............................................................................................. 9
2. Technical Specifications ........................................................................................................ 10
3. Measuring Principle ................................................................................................................ 11
4. Description of the Gauge and Schedule of Supply ............................................................... 12
4.1 Description of the gauge (Front and back side) ................................................................... 12
4.2 Supply Schedule ................................................................................................................. 12
4.3 Display MiniTest 420 ........................................................................................................... 13
4.4 Keyboard of MiniTest 420.................................................................................................... 14
5. Preparing Measurement ......................................................................................................... 15
5.1 Preparing the Gauge ........................................................................................................... 15
5.2 Selection of the Transducer ................................................................................................. 15
5.3 Preparing the Surface of Measuring Object ......................................................................... 16
6. How to operate the MiniTest 420 ............................................................................................ 17
6.1 Switch ON ........................................................................................................................... 17
6.2 How to take readings ........................................................................................................... 17
6.3 Calibration ........................................................................................................................... 17
6.3.1 Gauge Setting ............................................................................................................. 17
6.3.2 Influence of the Sound Velocity on Measurement ....................................................... 18
6.3.3 How to determine the Sound Velocity ......................................................................... 18
6.4 User Menu .......................................................................................................................... 19
6.4.1 Measuring Mode (Meas. Mode) .................................................................................. 19
6.4.2 Sound Velocity ............................................................................................................ 20
6.4.2.1 Materials ................................................................................................................ 20
6.4.2.2 Setting Sound Velocity ........................................................................................... 21
6.4.3 Measuring Unit ............................................................................................................ 21
6.4.4 Gain Setting ................................................................................................................ 22
6.4.5 Switch-Off Mode ......................................................................................................... 22
6.4.6 Contrast ...................................................................................................................... 22
6.4.7 Language .................................................................................................................... 22
6.4.8 Gauge Data ................................................................................................................ 23
6.4.9 Standard Setting ......................................................................................................... 23
7. Measuring Technology ........................................................................................................... 24
7.1 Measuring Methods ............................................................................................................. 24
7.2 Measurement on Pipes and Tubes ...................................................................................... 24
8. Maintenance and Precautions ................................................................................................ 25
8.1 Power Check ....................................................................................................................... 25
8.2 Precautions ......................................................................................................................... 25
8.2.1 General Precautions ................................................................................................... 25
8.2.2 Precautions to take during Measurement .................................................................... 25
Annex ........................................................................................................................................... 26
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