GE PT878GC Manuel d'utilisateur télécharger pdf (Page 206)

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).

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GE PT878GC Manuel d'utilisateur Page 206