GE CTF878, User & Service Manual

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Troubleshooting 4-5
February 2009
Pipe Problems
Pipe-related problems may result either from a failure to observe the
installation instructions, as described in the
Startup Guide , or from
improper programming of the meter. By far, the most common pipe
problems are the following:
1.
The collection of material at the transducer location(s).
Accumulated debris at the transducer location(s) will interfere
with transmission of the ultrasound signals. As a result, accurate
flow rate measurements are not possible. Realignment of the
transducers often cures such problems. Refer to
Installation ,
Chapter 2 of the Startup Guide for more details on proper
installation practices.
2.
Inaccurate pipe measurements.
The accuracy of the flow rate measurements is no better than the
accuracy of the programmed pipe dimensions. Measure the pipe
wall thickness and diameter with the same accuracy desired in the
flow rate readings. Also, check the pipe for dents, eccentricity,
weld deformity, straightness and other factors that may cause
inaccurate readings. Refer to
Initial Setup , Chapter 3 in the Startup
Guide for instructions on programming the pipe data. Also, see
Setting the Transducer Spacing and Tag Path in Chapter 2 of the
Startup Guide, for a discussion of this topic.