Badger Meter Dynasonics DXN, User Manual

Page: 24 / 112

Transducer
Spacing
OTEE: N
Use the DTTL transducer on pipes 24 inches and
larger and not on pipes smaller than 4 inches . You
can consider using the DTTL transducers on pipes
smaller than 24 inches if there are less quantifiable
aspects—such as sludge, tuberculation, scale, rubber
liners, plastic liners, thick mortar liners, gas bubbles,
suspended solids, emulsions—and smaller pipes
that are perhaps partially buried where a
V
-Mount is
required or desired .
Figure 21: Transducer positioning
Z-Mount Installation
Installation on larger pipes requires careful measurements of the linear and radial placement of the DTTR, DTTN, DTTL 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 22 . 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 flat surface . Fold the template in half, bisecting the circumference . See Figure 23 .
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 17 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 first transducer location) the dimension
derived in “Select a Mounting Configuration” on page 20 . 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 required spacing value that was recorded during setup . Mark opposite corners of the paper on
the pipe . Apply transducers to these two marks .
Transducer Installation
Page 24 November 2016 HYB-UM-00090-EN-04