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UMG70XV3-4EN 12.01.2009 91
10 Basic Measurement
10.7 Mounting and Positioning the Transducers
Observe the safety instructions in chapter 2.
The transducers will be fixed to the pipe by means of the supplied transducer mounting
fixture.
• Install the damping mats (see section ).10.6
• Use coupling foil (only if damping mats are not installed) or apply a bead of acoustic
coupling compound along the center line onto the contact surface of the transducers.
• Air pockets must not be between transducer contact surface, damping mat and pipe
wall.
• Make sure that the transducer mounting fixture applies the necessary pressure on the
transducers.
The transducer will be mounted so that the engravings on the transducers form an arrow
(see Fig. 10.7). The transducer cables show then in opposite directions. The arrow indi-
cates the positive flow direction (see section 10.9).
Fig. 10.7: Correct positioning of the transducers
10.7.1 Transducer Distance
The transducer distance given here is the distance between the inner edges of the trans-
ducers. A negative transducer distance is possible for a measurement in diagonal mode
on very small pipes (see Fig. 10.1).
A value for the transducer distance is recommended.
Mount the transducers on the pipe adjusting this value
(see section 10.5). Press ENTER.
A
- measuring channel
REFLEC
- reflection mode
DIAGON
- diagonal mode
Note!
The accuracy of the recommended transducer distance depends on
the accuracy of the pipe and medium parameters entered.
Transd. Distance
A:54 mm Reflec