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Chapter 9. Diagnostics and Troubleshooting
212 Transport® Model PT878 Portable Liquid Flowmeter User’s Manual
9.4.2 Clamp-on Transducer Problems (cont.)
4. PHYSICAL DAMAGE
Transducers may be physically damaged by being dropped onto a hard
surface or being struck against another object. Usually the transducer
connector is the part that is damaged, as it is the most fragile. Minor damage
may be repaired by carefully bending the connector back into shape. If the
connector cannot be repaired, replace the transducers. Note that transducers
must be replaced in pairs, and that after replacement the flowmeter
parameters should be checked (see Chapter 3, Programming Site Data).
5. CYCLE SKIP CONDITION
A cycle skip is usually caused by a distorted or altered signal due to poor
couplant, bad wall, or unusual fluid disturbances. To resolve a cycle skip,
recouple both transducers with proper couplant. Try standard CPL-1
couplant that is good to 212°F (100°C) or CPL-2 for up to 500°F (260°C).
In addition, make sure the pipe wall is free of paint and rust.
Contact the factory if you cannot solve a transducer-related problem.
9.4.3 Relocating Transducers
If the coupling or pipe wall are not the problem, try relocating the
transducers using the following method. However, before beginning, make
sure the transducers are not located on or near pipe welds or seams:
Move one transducer about 1/2 inch (12.7 mm) closer to the other
transducer. If this resolves the problem, you must modify the “S” dimension
programmed into the PT878 by using the following steps:
1. Press [MENU].
2. Scroll to the Program menu and press [ENTER].
3. Scroll to the Path option and press [ENTER].Then scroll down to the
Spacing box and press
[ENTER].
4. Use the numeric keys to enter the transducer spacing. Subtract 0.5 in.
(12.7 mm) from the original “S” and enter the new “S” dimension.
5. Press [F3] (OK).
If this method does not resolve the problem, contact the factory.