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Calculating Velocity (Pipe Material Sound Speed) (cont.)
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
text box. Use the numeric keys to enter the measured block
length. Press
3. Prepare the sample for calibration by applying couplant B to
its surface, and press
to Figure 9-11 below.
4. Hold the transducer steady against the sample, and wait for the
Set button to appear.
5. To calibrate the gauge, press the [
Set button.
6. Press
[ENTER]
Display
Block Length
Calculated
Figure 9-11: The Velocity Window,
Displaying the Calculated and Current Values
Servicing the PT878GC
[ENTER]
[ENTER]
to confirm the entry.
[ENTER]
. The screen now appears similar
(Set button) to start the calibration sequence.
Thickness Gauge Measure
Velocity
Graph
Press Set to Commit Value
22129.
Cancel
to open the Block Length
] arrow key to move to the
Zero
Set
1
Current
74733.
April 2009
]
Material
OK
9-15
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