Tokyo Keiki UFL-30, Руководство по установке и эксплуатации

Страница: 43 / 166

(2) Transducer Installation for Small Diameter Pipes (less than 250mm)
The V-method (reflection method) is generally recommended for small pipe diameter applications
although the Z-method (transmission method) may also be used when conditions are poor, such as
for rusty pipes, which reduce echo signals.
2-A. Reflection Method (V-method)
2-a-1. Wrap gauge paper around the pipe where you intend
to make the flow measurement as shown in
Fig.1-2-9-21. Make sure the paper is long enough to
overlap and that the overlapping edge is square.
Gauge paper may be ordered and included in the
standard installation kit.
2-a-2. Using a pencil or marking pen, extend the line created
by the overlap outward from each edge of the paper
onto the pipe. (Fig. 1-2-9-22).
Remove the gauge paper.
2-a-3. Prepare the pipe at the intended flow measurement point, making sure it is clean and free of
loose material.
See I-2-13 (Step 9-10) to determine the separation distance, “F-dist”, between the transducers
and draw a line to mark these points. Sand the pipe surface where the transducers are to be
positioned. The size of the sanding area should be 20mm inward from the line and 30mm
outward from the line and 35mm in the radial direction as shown in Fig. 1-2-9-23.
Note: A wider sanded area can be prepared which would enable easier transducer
installation but make re-painting of the pipe surface more difficult.
Note: See I-2-13 Step (9)-(10) to calculate F-dist.
Fig. 1-2-9-21
Fig. 1-2-9-22
≒
600mm
Fig. 1-2-9-23
35mm
Polish
F-dist
50mm 50mm
Polish
I- 32