Chapter 9. Diagnostics and Troubleshooting
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
Contact the factory if you cannot solve a
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.
212 | Transport® Model PT878 Portable Liquid Flowmeter User’s Manual |
