GE PT878GC User Manual download pdf (Page 261)

Diagnosis and Troubleshooting 10-11

April 2004

Transducer Problems

Ultrasonic transducers are rugged, reliable devices. However,

they are subject to physical damage from mishandling and

chemical attack. The most common transducer problems are

listed below.

1. LEAKS: Leaks may occur around the transducer and/or the

flowcell fittings. 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

GE Panametrics 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

4, Programming Site Data, to program the replacement

transducer data into the meter.

Contact GE Panametrics if you cannot solve a transducer-related

problem.

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GE PT878GC User Manual Page 261