FLUXUS ADM 8027, F801, ADM 8127B
9 Mounting of the Transducers
56
UMFLUXUS_F8V4-6-1EN, 2018-10-10
9
Mounting of the Transducers
9.1
Preparation of the Pipe
• The pipe has to be stable. It has to be able to withstand the pressure exerted by the transducer mounting fixture.
Rust, paint or other deposits on the pipe absorb the sound signal. A good acoustic contact between the pipe and the trans-
ducers is obtained as follows:
• Clean the pipe at the selected measuring point:
– If present, the paint layer has to be smoothed by sanding. The paint does not need to be removed completely.
– Remove any rust or loose paint.
• Use coupling foil or apply a bead of acoustic coupling compound along the center line of the contact surface of the trans-
ducers.
• Observe that there must be no air pockets between the transducer contact surface and the pipe wall.
9.2
Orientation of the Transducers and Transducer Distance
Mount the transducers onto the pipe in such way that the engravings on the transducers form an arrow (see Fig. 9.1 and
Fig. 9.2). The transducer cables show in opposite directions.
The transducer distance is the distance between the inner edges of the transducers (see section 3.3 and Fig. 9.1) and for
the transducers for mines the distance between the marks on the transducers shoe (see Fig. 9.2).
For the determination of the flow direction see section 11.8.
Select the installation instructions that correspond to the supplied transducer mounting fixture:
• Variofix L: see section 9.3
• Variofix C: see section 9.4
• Transducer for mines and FLEXIM clasp for mines: see section 9.5
9.3
Transducer Mounting Fixture Variofix L
When measuring in reflection arrangement, the transducer mounting fixtures are mounted on the same side of the pipe
(see Fig. 9.3).
When measuring in diagonal arrangement, the transducer mounting fixtures are mounted on the opposite sides of the pipe
(see Fig. 9.4).
In the following, the mounting of two transducer mounting fixtures in reflection arrangement is described (one transducer
mounting fixture for each transducer).
Fig. 9.1: Correct orientation of the transducers
and transducer distance
Fig. 9.2: Correct positioning of the transducers
for mining and transducer distance
Fig. 9.3: Transducer mounting fixture Variofix L (reflection arrangement)
transducer distance
transducer distance
