TransPort™ PT878GC User’s Manual
149
Chapter 9.
• Press the [
] or [
] arrow key to move to another tab to take readings or perform a velocity calibration.
• Press
[F2]
(Cancel) to return to Operate Mode without confirming the sound speed value.
• Press
[F3]
(OK) to confirm the new value. The PT878GC returns to Operate Mode.
9.1.4.5
Calculating Velocity (Pipe Material Sound Speed)
The nominal sound speed for your pipe material will give thickness measurements of reasonable accuracy. However,
for greater accuracy, calibrate pipe material sound velocity.
IMPORTANT:
This step is necessary only if the actual pipe material sound speed differs from the sound speed of the
material used in the calibration block. It is possible only if you have a sample of pipe material with the
thickness known to a high level of precision.
To open the Velocity window, press the [
] or [
] arrow key until you reach the Velocity tab and press
[ENTER]
. The
screen appears similar to Figure 138 below.
Figure 138: The Sound Speed Window
1.
Scroll to the Velocity tab. Press
[ENTER]
.
2.
To enter the block length (here, the thickness of the sample as measured with a caliper or calibrated sample),
press the [
] arrow key and then press
[ENTER]
to open the Block Length text box. Use the numeric keys to enter
the measured block length. Press
[ENTER]
to confirm the entry.
3.
Prepare the sample for calibration by applying couplant B to its surface, and press
[ENTER]
. The screen now
appears similar to Figure 139 below.
4.
Hold the transducer steady against the sample, and wait for the Set button to appear.
5.
To calibrate the gauge, press the [
] arrow key to move to the Set button.
6.
Press
[ENTER]
(Set button) to start the calibration sequence.
Display
Thickness Gauge Measure
Cancel
OK
Velocity
Graph
Zero Material
Block Length
0
Calculated
Current
Determine the Sound Speed
Содержание PT878GC
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Страница 197: ...TransPort PT878GC User s Manual 187 Appendix A Appendix A A 1 Menu Maps Figure 162 The Main Menu...
Страница 198: ...Appendix A 188 TransPort PT878GC User s Manual...
Страница 199: ...Appendix A TransPort PT878GC User s Manual 189 Figure 163 The Site Menu...
Страница 200: ...Appendix A TransPort PT878GC User s Manual 190 Figure 164 The Program Menu Transducer Lining Fluid and Path Options...
Страница 201: ...Appendix A TransPort PT878GC User s Manual 191 Figure 165 The Program Menu Pipe Option...
Страница 204: ...Appendix A TransPort PT878GC User s Manual 194 Figure 168 The Meter Menu...
Страница 205: ...Appendix A TransPort PT878GC User s Manual 195 Figure 1 Logging Mneu...
Страница 212: ...Appendix D 202 TransPort PT878GC User s Manual...
Страница 218: ...Index 208 TransPort PT878GC User s Manual...
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