Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 33)

Rev. 8/02
- 2.18 - TFXM
Mounting Transducers in Z-Mount Configuration
Installation on larger pipes requires careful measurements to
the linear and radial placement of the DTT transducers. Failure
to properly orient and place the transducers on the pipe may
lead to weak signal strength and/or inaccurate readings. The
section below details a method for properly locating the trans-
ducers on larger pipes. This method requires a roll of paper
such as freezer paper or wrapping paper, masking tape and a
marking device.
Wrap the paper around the pipe in the manner shown in Figure
2.6. Align the paper ends to within 0.25 inches [6mm].
Mark the intersection of the two pieces of paper to indicate the
circumference. Remove the template and spread it out on a flat
surface. Fold the template in half, bisecting the circumference.
See Figure 2.7.
Crease the paper at the fold line. Mark the crease. Place a
mark on the pipe where one of the transducers will be located.
See Figure 2.5 for acceptable radial orientations. Wrap the
template back around the pipe, placing the beginning of the pa-
per and corner in the location of the mark. Move to the other
side of the pipe and mark the ends of the crease. Measure
from the end of the crease (directly across the pipe from the first
PART 2 - TRANSDUCER POSITIONING
Installation on
Large Pipes
Figure 2.6 Paper Template Alignment