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Servicing the PT878GC 9-5
April 2004
Setting up the Thickness Gauge
For greatest accuracy in flow applications, the PT878GC can
measure pipe wall thickness using an optional thickness gauge
transducer, instead of relying on the nominal pipe wall thickness.
In Thickness Gauge mode, the PT878GC does not measure flow,
but it can determine the thickness of most standard metal and
plastic pipe materials over a range from 0.05 to 3 in. (1.3 to 76.2
mm). Figure 9-4 below illustrates use of the optional thickness
gauge.
Figure 9-4: PT878GC Thickness Gauge in Operation
The PT878GC offers two basic thickness gauge functions: using
the gauge to measure thickness after entering the pipe material,
and calibrating the gauge. For the highest possible accuracy, you
can also calibrate the velocity of sound in the pipe material.
Using the thickness gauge involves three steps:
1. Entering the material and sound speed (in the Material
window on page 9-7),
2. Measuring the pipe wall thickness (in the Display window on
page 9-9), and
3. If the measurement seems unreasonable, examining the
acoustic signal to diagnose the problem (in the Graph window
on page 9-10).