Flexim FLUXUS F704**-A2 Series, Руководство пользователя

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6 Installation FLUXUS F70x
UMFLUXUS_F7V4-6-2EN, 2017-10-01 31
6.4 Transducers
6.4.1 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.
6.4.2 Orientation of the Transducers
Mount the transducers onto the pipe in such way that the engravings on the transducers form an arrow (see Fig. 6.9). The
transducer cables show in opposite directions.
For the determination of the flow direction see section 9.8.
Select the installation instructions that correspond to the supplied transducer mounting fixture.
• Variofix L: see section 6.4.3
• Variofix C: see section 6.4.4
• mounting shoe and clasp: see section 6.4.5
6.4.3 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. 6.10).
When measuring in diagonal arrangement, the transducer mounting fixtures are mounted on the opposite sides of the pipe
(see Fig. 6.11).
In the following, the mounting of two transducer mounting fixtures in reflection arrangement is described (one transducer
mounting fixture for each transducer).
Attention! Observe the Safety Instructions for the Use in Explosive Atmosphere (see document SIFLUXUS).
Fig. 6.9: Correct orientation of the transducers
Fig. 6.10: Transducer mounting fixture Variofix L
(reflection arrangement)
Fig. 6.11: Transducer mounting fixture Variofix L
(diagonal arrangement)
transducer distance