April 2004
9-6 Servicing the PT878GC

Setting up the Thickness Gauge (cont.)

Calibrating the thickness gauge involves up to two additional
steps:
4. Calibrating the thickness gauge itself (in the Zero window on
page 9-12), and
5. Calibrating the velocity of sound in the pipe material (in the
Velocity window on page 9-14), if possible and if the pipe
material is not the material entered in the Zero window. This
step requires a trustworthy reference, either a section of pipe
(such as a flange or open pipe section) that can be measured
with calipers or another measurement device , or a thickness
calibration block of the same material.