Dwyer UFC User Manual download pdf (Page 18)

2: Installation

10. Finally, lock the thumb screws in position by fitting the two supplied locknuts.

11. Ensure the transducer signal cables are correctly connected to the UFC instrument – i.e. with the RED cable

is connected to the upstream transducer connector and the BLUE cable to the downstream transducer

connector.

2.3.5 Transducer attachment (diagonal mode)

This mode of operation requires two transducer holders fitted on opposite sides of the pipe, as shown in Figure

2.12 – notice that the transducer holders are still fitted on a 45° axis with respect to the top of the pipe. When

used with type ‘A’ or ‘B’ transducers, the transducer holders used are identical to that shown above, and the

second transducer holder and fixings must be purchased as an option kit.

When installing the equipment to operate in the diagonal mode, the method of securing the transducers to the

transducer holders and connecting them to the UFC instrument is identical to that described above for the reflex

mode. The major difference is that you have to physically mark out the required position of the transducers on the

pipe in order to determine where to attach the transducer holders.

1. Obtain and note the required separation distance between the transducers using the ‘Quickstart’ menu, as

described in Paragraph 3.2.

2. Using whatever means available, mark a reference line around the circumference of the pipe approximately

where the upstream transducer is to be fitted – line ‘A’ in Figure 2.12.

3. On line ‘A’, mark a position (point ‘X’) on an axis of approximately 45° from the top of the pipe, then draw a

three foot line (‘B’) perpendicular to ‘A’ and parallel to the pipe axis.

4. On line A, mark a position (point ‘Y’) 180° opposite point ‘X’.

5. From point ‘Y’, draw a three foot long line (‘C’) perpendicular to ‘A’ and parallel to the pipe axis. This is shown

as a dashed line in Figure 2.12 as it is on the rear of the pipe.

6. Mark a position (point ‘Z’) on line ‘C’ which is equal to the transducer separation distance noted in step 1 from

point ‘Y’.

7. Position and attach the upstream transducer holder to the pipe such that line ‘B’ runs centrally along the

length of the transducer holder and point ‘X’ is within the transducer attachment part of the transducer holder.

8. Fit the upstream transducer (red cable) to the transducer holder as described in Paragraph 2.3.4 such that

the leading face of the transducer aligns with line ‘A’.

9. Position and attach the downstream transducer holder to the pipe such that line ‘C’ runs centrally along the

length of the transducer holder and point ‘Z’ is within the transducer attachment part of the holder.

10. Fit the downstream transducer (blue cable) to the transducer holder as described in Paragraph 2.3.4 such

that the leading face of the transducer aligns with point ‘Z’.

11. Connect the transducer cables to the UFC instrument.

Key Point: For installations on larger pipes (in the range 79 inches to 197 inches

O.D.) it is necessary to purchase the type ‘D’ transducer kit which contains the

transducers together with their particular mounting rails and fitting instructions.

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Dwyer UFC User Manual Page 18