Dynasonics DXN Portable Ultrasonic Measurement System - Manual (Page 30)

4. Place each transducer under the strap with the flat face—amber plastic window—positioned towards the pipe. The
notch on the back of the transducer will provide a mounting surface for the strap. The transducer cables must be
facing in the same direction and in the downstream direction for proper operation.
FLOW
Top View
of Pipe
Wires Pointing in Direction of Flow
Wires Pointing in Direction of Flow
FLOW
FLOW
Figure 36: Doppler Transducer Placement
NOTE: N
Large pipes may require two people for this procedure.
5. Tighten the strap strong enough to hold the transducers in place, but not so tight that all of the couplant squeezes
out of the gap between the transducer face and pipe. Ensure that the transducers are squarely aligned on the pipe
and 180° apart.
6. Route the transducer cables back to the area where the transmitter will be, avoiding high voltage cable trays
and conduits.
NOTE: N Where a high amount of particulates are expected mounting the transducers side-by-side may allow enough sound
reflection for the Doppler function to work.
Figure 37: Side-By-Side Placement
NOTE: N
Low particulate content may sometimes be overcome by mounting the Doppler transducers downstream of a pipe
elbow. A better solution to a low particulate fluid would be switching over to transit time measurements.
DXN Portable Ultrasonic Measurement System
Page 30 February 2013