Dynasonics DDFXD Doppler Ultrasonic Flow Meter - Manual (Page 16)

16 06-DPP-UM-00147 02/12
FLOW
Top View
of Pipe
FIGURE 2.3 - TRANSDUCER PLACEMENT
PROCEDURE:
1) Large pipe installations utilize stainless steel straps to secure the transducers to the outside of
the pipe. The DFX system is shipped with four 36” (900 mm) straps, which are suitable for pipes
up to 39” (1000 mm) diameter. Select the proper number of transducer straps to allow a com-
plete strap to go around the circumference of the pipe. If a pipe is larger than 39” (1000 mm), it is
recommended that a single strap/buckle arrangement be utilized to reduce the number of strap
connections. See Table 2.1. The straps can be connected together to make a continuous length.
Small pipe installations do not utilize straps, but use an integral clamping mechanism built into
the transducer.
Pipe Size Straps Required
1” to 9” (25 mm to 225 mm) 1
10” to 19” (250 mm to 480 mm) 2
20” to 29” (500 mm to 740 mm) 3
30” to 39” (760 mm to 1000 mm) 4
TABLE 2.1 - STRAPS REQUIRED VS. PIPE SIZE
2) Wrap the strap around the pipe in the area where the transducers are to be mounted. Leave the
strap loose enough to allow the transducers to be placed underneath. If multiple straps are being
used, it can be beneficial to wrap electrical tape around all but one strap connection to secure the
strap worm screws in place.
3) Spread an even layer of coupling compound, approximately 1⁄8” (3 mm) thick, to the prepared
transducer mounting areas of the pipe.