Dwyer Series PUB - Manual (Page 12)

2: Installation
8
2.2 Transducer Attachment
The transducers are fitted to adjustable transducer holders which are secured to the pipe using wrap-around
chains and mechanically connected together by a steel separation bar. The separation bar also acts as a ruler to
allow the distance between the transducers to be accurately set to the value determined by the PUB instrument.
When fitting the transducer holders, it is easiest to assemble them onto the separation bar and adjust to the
required separation distance before attaching them to the pipe.
2.2.1 Preparation
1. Before you attach the transducers you should first ensure that the proposed location satisfies the distance
requirements shown in Figure 2.1, otherwise the resulting accuracy of the flow readings may be affected.
2. 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.
2.2.2 Attaching the transducer holders
Figure 2.2 Transducer holder attachment
1. Slide the separation bar (D) into the front of the left hand transducer holder, align the front edge of the
transducer holder with ‘0’ on the ruler scale (E) and secure it in place by tightening the thumbscrew (C).
2. Slide the other end of the separation bar into the front of the right hand transducer holder, align the front edge
of the transducer holder to the required separation distance (obtained from the PUB instrument) on the ruler
(F), then secure it in place by tightening the thumbscrew.
A
B
C
D
E
F
G
A: Tensioning thumb-wheel.
B: Tension bar.
C: Separation bar securing
screw.
D: Separation bar.
E: Ruler scale (0).
F: Set separation distance.
G: Securing chain.