6 Mounting
FLUXUS G801
6.2 Transducers
31
UMFLUXUS_G801V1-0EN, 2020-06-26
6.2.2
Mounting of damping mats
Before mounting the transducer mounting fixture, damping mats have to be installed.
• Ultrasonic waves do not only propagate in the fluid but also in the pipe wall. Transducer damping mats are mounted to
counteract the propagation of ultrasonic waves in the pipe wall.
• Ultrasonic waves are reflected at reflection points (e.g., flanges). Pipe damping mats are mounted to reduce the
amplitude of the reflected ultrasonic waves.
• Depending on the transducer type, it can be necessary to mount several layers of damping mats.
6.2.2.1
Transducer damping mats
Transducer damping mats are mounted lengthwise on the pipe.
The mounting depends on the outer pipe diameter:
• < 900 mm: The transducer damping mats are mounted on the entire pipe circumference.
• > 900 mm: The transducer damping mats are only partially mounted on the pipe.
The transducer mounting fixture is mounted on the transducer damping mats.
Bidirectional measurement
Measurement in reflection arrangement
with 2 beams and 2 planes
• The sound beam plane is selected
according to the nearest elbow
(horizontal or vertical, depending on the
pipe orientation, see above).
• The 2 sound beam planes are selected
at an angle of 45° to the elbow plane.
The elbow is upstream of the measuring
point.
• On horizontal pipes, the transducers are
mounted on the upper half of the pipe.
Fig. 6.3:
Mounted transducer damping mats in reflection arrangement
1 – transducer mounting fixture
2 – transducer damping mats
flow direction
flow direction
1
2
