2: Installation
U3000/U4000 User Manual 11
(Issue 2.0)
shown in Figure 2.3. Flow measurements can be made on shorter lengths of straight pipe, down to 10
diameters upstream and 5 diameters downstream, but when the transducers are positioned this close to any
obstruction the resulting errors can be unpredictable.
2.3.2 Preparation
Before you attach the transducers you should first ensure that the proposed location satisfies the distance
requirements shown in Figure 2.3
otherwise the resulting accuracy of the flow readings may be affected.
Prepare the pipe by degreasing it and removing any loose material or flaking paint in order to obtain the best
possible surface. A smooth contact between pipe surface and the face of the transducers is an important
factor in achieving a good ultrasound signal strength, and therefore maximum accuracy.
2.3.3 Transducer attachment
Figure 2.4 Transducer attachment (completed assembly)
The type ‘A’ or ‘B’ transducers are fixed to the pipe using the adjustable guide rail assembly shown in Figure
2.4. The guide rail itself is secured to the pipe using two wrap-around steel bands, or by chain (optional). For
user convenience, an imperial ruler (inches) is etched on the top side plate and a metric (millimetres) ruler is
etched on the bottom side plate – as shown in Figure 2.4. Once the guide rail assembly is fully assembled the
transducers are locked into position by tightening two thumb screws which are themselves then secured by
M5 locking nuts.
Key Point: Do not expect to obtain accurate results if the transducers are positioned
close to any obstructions that distort the uniformity of the flow profile.
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