Dynasonics TFXP Series Transit Time Ultrasonic Flow Meter - Manual (Page 26)

Rev. 5/09
- 2.8 - TFXP
After selecting an optimal mounting location (Step 1) and
successfully determining the proper transducer spacing (Step 2) the
transducers may now be mounted onto the pipe.
Before the transducers are mounted onto the pipe surface, an area
slightly larger than the flat surface of each transducer must be
cleaned of all rust, scale and moisture. For pipes with rough
surfaces, such as ductile iron pipe, it is recommended that the pipe
surface be ground flat. Paint and other coatings, if not flaked or
bubbled, need not be removed. Plastic pipes typically do not
require surface preparation other than soap and water cleaning.
The DTTN and DTTH transducers must be properly oriented and
spaced on the pipe to provide optimum reliability and performance.
On horizontal pipes, when Z-Mount is required, the transducers
should be mounted 180 radial degrees from one another and at
least 45 degrees from the top-dead-center and bottom-dead-center
of the pipe. See Figure 2.2. Also see Z-Mount Transducer
Installation on page 2.13. On vertical pipes the orientation is not
critical.
3. Transducer Mounting
Pipe
Preparation
Figure 2.2 — Transducer Orientation - Horizontal Pipes
PART 2 - TRANSDUCER & RTD INSTALLATION