Installing The General Clamping Fixture - Gcf; The Double-Traverse Method - Gcf - GE C-PT Installation Manual

5.3 Installing the General Clamping Fixture - GCF

The General Clamping Fixture (GCF) acts as a permanent transducer holder. The fixture has two blocks that are used
for double- and single-traverse methods. Steel straps secure the blocks to the pipe for a permanent installation.
The blocks are positioned properly using the spacing dimension calculated by the flowmeter. Then the transducers are
mounted into the blocks. Figure 7 shows a long block.
The transducer installation consists of mounting the GCF to the pipe and then mounting the transducers into the blocks.
Refer to the appropriate section that follows for instructions:
•
Double-traverse Method - below
•
Single-traverse Method - page 23
5.3a The Double-Traverse Method - GCF
Note:
The instructions in this section can also be used for a multiple-traverse method. However, you must use an
EVEN number of traverses. The distance the signal travels from one side of the pipe wall to the opposite side of
the pipe wall is considered one traverse. For more than two traverses, consult the GE factory.
There are three advantages in using the double-traverse method:
•
Accuracy is improved because the signal is in the fluid longer than with a single-traverse.
•
This configuration can reduce some effects of an underdeveloped flow profile.
•
If there is enough pipe length available, the double-traverse fixture is easier to install.
C-PT Ultrasonic Flow Transducer Installation Guide
End View
Figure 7: General Clamping Fixture Block
Side View
19