Panametrics DigitalFlow XMT868i, Руководство по обслуживанию, Страница: 32 / 74

Chapter 3. Diagnostics
8 DigitalFlow™ XMT868i Service Manual
3.5 Transducer Problems
Ultrasonic transducers are rugged, reliable devices. However, they are subject to physical damage from 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 transducers problems are largely dependent on the type of transducers used, wetted or clamp-on, the
following list of potential problems is grouped according to transducer type. Contact GE if you cannot solve a
transducer-related problem.
3.5.1 Wetted Transducer Problems
1. LEAKS: Leaks may occur around the transducer and/or the flowcell fittings. Repair such leaks immediately. If the
leaking fluid 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 face. If corrosion is suspected, remove the transducer from the flowcell and carefully inspect the
electrical connector and the transducer face for roughness and/or pitting. Any transducer damaged in this
manner must be replaced. Contact GE 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 most subject to damage.
Minor damage may be repaired by carefully bending the connector back into shape. If the connector can not be
repaired, the transducer must be replaced.
IMPORTANT: Transducers must be replaced in pairs. Refer to Chapter 2, Initial Setup, of the Startup Guide to program
the new transducer data into the meter.
If the instructions in this section fail to resolve the problem, contact GE for assistance.