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Chapter 9. Diagnostics and Troubleshooting
210 Transport® Model PT878 Portable Liquid Flowmeter User’s Manual
9.4 Transducer Problems
Ultrasonic transducers are rugged. However, they are subject to physical
damage due to mishandling and chemical attack. Clamp-on transducers are
also subject to installation variables such as physical misalignment and
faulty coupling to the pipe on which they are mounted.
Because transducer problems are largely dependent on the type of
transducer used, wetted or clamp-on, the following list of potential
problems is grouped according to transducer type. Contact the factory if you
cannot solve a transducer-related problem.
9.4.1 Wetted Transducer Problems
1. LEAKS
Leaks may occur around the transducer and in the fittings of the flow cell.
Repair as you would any other leak. Check the transducer and cables for
damage if the leaking fluid is corrosive.
2. CORROSION DAMAGE
Wetted transducers may be damaged by corrosive fluids if the transducer
material does not match the application. Most often, corrosion damage
occurs at the electrical connector. To check for damage, remove the
transducer from the flow cell. If the wetted end of the transducer is rough
and pitted, the transducer may have to be replaced. GE can supply suitable
transducer materials for most fluids. Contact the factory for information on
special transducers.
3. INTERNAL DAMAGE
An ultrasonic transducer consists of a ceramic “crystal” bonded to the
transducer case. The bond between the crystal and the case may be damaged
by extreme mechanical shock and by temperature extremes. The crystal
itself can also be damaged by the same conditions. The internal wiring can
be corroded or shorted if contaminants enter the transducer housing.