Z-Mount Configuration
Installation on larger pipes requires careful measurements of the linear and radial placement of the DTTR, DTTN and DTTH
transducers. Failure to properly orient and place the transducers on the pipe may lead to weak signal strength and/or
inaccurate readings. This section details a method for properly locating the transducers on larger pipes. This method requires
a roll of paper such as freezer paper or wrapping paper, masking tape and a marking device.
1. Wrap the paper around the pipe in the manner shown in Figure 19. Align the paper ends to within 1/4 inch (6 mm).
2. Mark the intersection of the two ends of the paper to indicate the circumference. Remove the template and spread it out
on a at surface. Fold the template in half, bisecting the circumference. See Figure 20.
3. 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 10 for acceptable radial orientations. Wrap the template back around the pipe, placing the beginning of the
paper and one corner in the location of the mark. Move to the other side of the pipe and mark the pipe at the ends of
the crease. Measure from the end of the crease (directly across the pipe from the rst transducer location) the dimension
derived in "Select a Mounting Configuration" on page 17. Mark this location on the pipe.
4. The two marks on the pipe are now properly aligned and measured. If access to the bottom of the pipe prohibits the
wrapping of the paper around the circumference, cut a piece of paper 1/2 the circumference of the pipe and lay it over the
top of the pipe. The equation for the length of 1/2 the circumference is: 1/2 Circumference = Pipe O.D. × 1.57
The transducer spacing is the same as found in "Position and Secure the Transducer" on page 20. Mark opposite corners of the
paper on the pipe. Apply transducers to these two marks.
LESS THAN ¼” (6 mm)
Figure 19: Paper template alignment
Line Marking
Circumference
Edge of
Paper
Fold
Pipe Circumference
Crease
(Center of Pipe)
Transducer
Spacing
Figure 20: Bisecting the pipe circumference
5. For DTTR, DTTN and DTTH transducers, place a single bead of couplant,
approximately 1/2 inch (12 mm) thick, on the at face of the transducer.
See Figure 12. Generally, a silicone-based grease is used as an acoustic
couplant, but any good quality grease-like substance that is rated to
not ow at the operating temperature of the pipe is acceptable.
6. Place the upstream transducer in position and secure with a stainless
steel strap or other fastening device. Straps should be placed in the
arched groove on the end of the transducer. A screw is provided to help
hold the transducer onto the strap. Verify that the transducer is true to
the pipe, adjust as necessary. Tighten transducer strap securely. Larger
pipes may require more than one strap to reach the circumference of
the pipe.
TOP VIEW
OF PIPE
Figure 21: Z-Mount transducer placement
7. Place the downstream transducer on the pipe at the calculated transducer spacing. See Figure 21. Using rm hand
pressure, slowly move the transducer both towards and away from the upstream transducer while observing signal
Transducer Installation
Page 23 April 2016 TTM-UM-00369-EN-03
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