Dwyer UFC User Manual download pdf (Page 16)

2: Installation

Type ‘A’ or ‘B’ transducers are attached to the pipe using the adjustable transducer holder assembly shown in

Figure 2.4. The transducer holder itself is secured to the pipe using two wrap-around steel bands. For user

convenience, an imperial ruler (inches) is etched on the top side plate and a metric (millimeters) ruler is etched on

the bottom side plate – as shown in Figure 2.4. Once the transducer holder assembly is fully assembled, the

transducers are locked into position by tightening two thumb screws which are themselves then secured by

locking nuts.

Note: When using the UFC in the diagonal or reflex mode on pipes over 16 inches diameter, two transducer

holders are required with one transducer mounted in each – see Paragraph 2.3.5 for diagonal mode details.

2.3.3 Attaching the transducer holder to the pipe

1. Remove the two nylon flags from the transducer

holder.

2. Position the transducer holder horizontally on

the pipe at 45° to the horizontal and secure it in

position using the stainless steel banding, as

shown in Figure 2.5.

Note: In the following procedure the transducer

holder is installed with the rectangular opening

facing towards the upstream end of the pipe.

2.3.4 Fitting the transducers

1. Attach the nylon flags to the two

transducers, as shown in Figure

2.6.

2. Using a syringe applicator, apply a

narrow bead (0.1in) of acoustic

couplant to the base of both

transducers.

3. Insert the downstream transducer

cable (blue) through the holder’s

end plate and up through the

rectangular opening at the left-

hand side of the transducer

holder, as shown in Figure 2.7.

Note: When carrying out the following steps, handle the transducer assembly with care to avoid smearing the

acoustic couplant on the pipe while attaching the transducer to the transducer holder.

4. Connect the downstream cable (blue) to one of the transducers, then lower the transducer and cable through

the rectangular opening as shown in Figure 2.8.

5. Align the slots in the sides of the nylon flag with the edges on the top of the transducer holder, then carefully

slide the transducer assembly to the middle of the holder.

6. Tighten the thumb screw (clockwise) until the transducer is locked to the top of the transducer holder. This is

done to prevent the acoustic couplant from touching the pipe.

Figure 2.5

Figure 2.6

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