Appendix C
A-62
4.2 Spacing and Mounting the Transducers
In order to maximize signal strength and accuracy, it is essential to properly space and
mount the transducers as follows:
1. Select a proper transducer site, following the guidelines in Section 4.1.
2. Configure the flowmeter (Chapter 3). As a minimum, enter the critical parameters
listed in the quick setup procedure (Section 3.5).
NOTE:
For more information on which transducer mounting method to select when
configuring the flowmeter, refer to Section 4.4.
Once the flowmeter has been configured, the flowmeter calculates the required
transducer spacing and stores it in Menu 25.
3. Access Menu 25 and note the value for the transducer spacing.
NOTE:
If the pipe outer diameter (OD) is between 1 and approximately 16 inches (25
and 406 millimeters), the slide track assembly may be used to simplify the
mounting procedure. Refer to Section 4.2.1.
4. Refer to the installation instructions for the selected mounting method, as follows:
!
V method: Section 4.4.1
!
W method : Section 4.4.2
!
Z method: Section 4.4.3
5. Clean the area of the pipe where the transducers are to be installed. Remove any rust,
scale, or loose paint. (Well-bonded paint need not be removed.)
IMPORTANT:
On horizontal pipes, the transducers should be mounted in the 3 o’clock
and 9 o’clock positions. This avoids sediment along the bottom and gas
bubbles or air pockets along the top of the pipe, which can cause signal
loss.
6. Apply a wide bead of PolyGlide
™
sonic coupling compound lengthwise down the
center of the face of each transducer.
IMPORTANT:
The coupling compound should squeeze out from around the edges of
the transducer when it is placed against the pipe. There should be no air
gaps between the transducer and the pipe. Refer to Section 4.6 for more
information on applying and replacing PolyGlide
™
and for information
on the use of other sonic coupling compounds for high temperature,
underground, or submerged installations.
7. Attach the transducers to the pipe using the stainless steel pipe clamps or the nylon
(cloth) tie down straps (Section 4.7). Tighten both straps securely, ensuring that the
transducers are aligned normal to the pipe (Section 4.3).
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