Calculating Velocity (Pipe Material Soundspeed) - GE TransPort PT878 User Manual

Chapter 8. Servicing the PT878

8.4.5 Calculating Velocity (Pipe Material Soundspeed)

The nominal soundspeed for your pipe material will give thickness
measurements of reasonable accuracy. However, for greater accuracy,
calibrate pipe material sound velocity.
IMPORTANT:
To open the Velocity window, press the [ ] or [ ] arrow key until you
reach the Velocity tab and press
Figure 113 below.
Display
Block Length
Calculated
Scroll to the Velocity tab as shown in Figure 113 above. Press
1.
168
This step is necessary only if the actual pipe material
soundspeed differs from the soundspeed of the material
used in the calibration block. It is possible only if you have
a sample of pipe material with thickness known to a high
level of precision.
Thickness Gauge Measure
Graph
Determine the Sound Speed
Figure 113: Soundspeed Window
Transport® Model PT878 Portable Liquid Flowmeter User's Manual
. The screen appears similar to
[ENTER]
Velocity
Zero Material
0
Current
Cancel OK
[ENTER]
.