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April 2009
Installing the PI Fixture and Transducers
The PI clamping fixture holds transducers on pipes from 8 to 24
in. in diameter. It comes with either a chain or strap, depending
on the selection made with the initial order from GE Sensing. To
install the fixture and transducers, complete the following steps:
Surveying the Pipe
1. Measure the pipe circumference to an accuracy of ±2 mm
(±1/16 in.)
IMPORTANT:
2. Tightly wrap the layout tape once around the entire pipe and
line up the edges. Using the tape as a template guide for
marks, mark scribe lines around the entire circumference of
the pipe, as shown in Figure 3-13 below.
Figure 3-13: Marking Circumferential Lines on the Pipe
3. Line up the zero scale of the layout tape at the desired location
of the first transducer. (For a typical installation, this point
will be the 3 o'clock position on a horizontal pipe.) Mark each
of the two circumferential lines at the zero point. Connect
each of these marks using a straight edge (for example, the
edge of the layout tape) as shown in Figure 3-14 on the next
page.
3-18
Installing the Dampening Material, Transducers and Fixtures
Do not use a calculated value or a nominal value
for the circumference.
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