2: Installation
15
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
2.15 – 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 2.15.
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 2.15 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 use the type 'D' transducer kit which contains the transducers
together with their particular mounting rails and fitting instructions. This will have
been supplied with the electronics assembly that is configured to work with these
larger pipes.
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