Transducer Problems - GE DigitalFlow GC868 Service Manual

April 2008

Transducer Problems

3-6
Ultrasonic transducers are rugged, reliable devices. However, they are
subject to physical damage from mishandling and chemical corrosion.
The most common transducer problems are listed below:
1. LEAKS: Leaks may occur around the transducer. Repair such leaks
immediately. If the leaking gas is corrosive, carefully check the
transducer and cables for damage, after the leak has been repaired.
2. CORROSION DAMAGE: If the transducer material was not
properly chosen for the intended application, the transducers may
suffer corrosion damage. The damage usually occurs either at the
electrical connector or on the transducer surface. If corrosion is
suspected, remove the transducer from the flowcell and carefully
inspect the electrical connector and the transducer surface for
roughness and/or pitting. Any transducer damaged in this manner
must be replaced. Contact the factory for information on
transducers in materials suitable for the application.
3. INTERNAL DAMAGE: An ultrasonic transducer consists of a
ceramic crystal bonded to the transducer case. The bond between
the crystal and the case, or the crystal itself may be damaged by
extreme mechanical shock and/or temperature extremes. Also, the
internal wiring can be corroded or shorted if contaminants enter
the transducer housing.
4. PHYSICAL DAMAGE: Transducers may be physically damaged by
dropping them onto a hard surface or striking them against another
object. The transducer connector is the most fragile part and is the
one most subject to damage. Minor damage may be repaired by
carefully bending the connector back into shape. If the connector
cannot be repaired, the transducers must be replaced.
Note: Transducers must be replaced in pairs. Refer to Chapter 2,
Initial Setup, of the Startup Guide to program the replacement
transducer data into the meter.
If the instructions in this section fail to resolve the problem, contact
the factory for assistance.
Diagnostics