Aligning The Downstream Transducer For Extended Range Installations - GE T17 Installation Manual

4.2.3 Aligning the Downstream Transducer for Extended Range Installations

For extended velocity range applications, the head of the downstream transducer is angled at 6° so that it points
upstream (into the flow) by 6°. This allows the ultrasonic signal to be pushed into alignment at very high flow rates. At
low flow rates, the beam is wide enough to tolerate the initial 6° misalignment.
Note: Only the downstream transducer flange alignment is crucial to the functionality of the meter. For installation
of the upstream transducer, see "Mounting the Insertion Mechanism" on page 58.
Note: This step of the installation requires two people. One person should support the barrel and one person should
operate the alignment fixture.
CAUTION!
Installation" on page 57, that gasket is crucial to sealing the assembly.
1. Locate the supplied alignment tool shown in Figure 75 below (part number
and fine-tune (if necessary) the transducer alignment by rotating the Barrel Assembly prior to final tightening
of the mounting nuts and studs.
Note: Although this process ensures optimum performance, it is not required for proper operation.
2. Find the scribe line on the downstream transducer tube near the transducer end with the BNC connector. This
scribe line indicates the direction of the angled transducer head. Verify by direct observation that the scribe line
on the transducer lines up with the alignment marking on the flange at the top of the Barrel. If it does not,
contact GE for assistance.
Model T17 Installation Guide
Although the images in this section do not show the gasket referenced in "Preparing for
Figure 75: Alignment Tool
Chapter 4. Inserting T17 Transducers into the Pipe
). This tool is used to check
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