GE General Electric Oxygen Equipment PT878 Benutzerhandbuch

Chapter 9. Diagnostics and Troubleshooting

210

Transport® Model PT878 Portable Liquid Flowmeter User’s Manual

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.

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. 

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.

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.