Dynasonics DXN Portable Ultrasonic Measurement System - Manual (Page 49)

If measuring copper tubing or other types of metal tubing with wall thickness less than 0.1” or 2.5 mm:
8. Apply couplant to pipe / transducer and apply transducer to pipe such that the cable is perpendicular to the pipe (as
will the notch in the transducer). The waveform should settle in a few seconds.
Close
Store to Pipe Wall Setting
0.123 in
X -
X -
X
X Y
Y
Y
Y
35000
-35000
-21000
21000
7000
-7000
30 45 60 75 90 105 120 135 150 15 0
Apply Transducer and Couplant to Pipe
THEN Check to Lock Reference
Automatic Analysis Mode
Ultrasonic Thickness Gauge
Copper OD=0.625 in
01P Metal Tubing
Thickness Waveform Thickness Envelope
Best Peak
0.387 in
Peak 1
0.319 in
Peak 2
0.500 in
PkM
Rpk
Pk1 Pk2
Figure 65: Tubing Thickness Gauge Wizard Screen
9. Next Press Apply Transducer and Couplant to Pipe… check box. A check should appear in the box and the Red-Rpk line
in the waveform display will stop moving. This locks the “reference”.
10. The inside of the green button in the lower right of the screen will show the pipe wall thickness measurement.
11. Lastly, press the green measurement button to store pipe thickness to Site>Pipe>Wall Thickness.
Advanced Mode
The advanced mode is intended users with knowledge of ultrasonic testing or when the automatic settings aren’t appropriate.
To enter Advance Mode, uncheck “Automatic Analysis Mode”. The manual settings will reflect the automatic settings when first
entering the wizard.
The user can select the type of waveform and analysis from the pull-down menu. The first two digits represent how many
signal periods are transmitted, and the text indicates the analysis used in making the measurement:
01P Metal Tubing 1 Pulse Tubing Mode
01P Thin Metal Pipe 1 Pulse Thin Pipe Mode/ Pipe Mode
02P Generic Metals 2 Pulse Pipe Mode
03P Plastics, Iron Pipe 3 Pulses Pipe Mode
05P Thick Plastics, Ceramics, Mortar 5 Pulses Pipe Mode
15P Very Thick 15 Pulses Pipe Mode
Table 10: Pipe Mode Explanations
In Pipe Mode, the user must lock the reference signal BEFORE the transducer is applied to the pipe. Ultrasonic transit time is
measured as the difference in time ultrasound leaving the transducer face to the first reflection from the fluid-pipe interface.
The reference is detected as the large peak below a timed threshold; the largest amplitude peak is used as the first reflection.
In Thin Pipe Mode, the user also must lock the reference signal BEFORE the transducer is applied to the pipe.
Installation & Operation Manual
Page 49 February 2013