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Section 3
2. Assemble the transducers to the spacer bar, with the cable connectors facing away from each
other as shown above. The spacer bar is attached to a transducer using a transducer index screw.
One transducer is attached using the "REF" hole on the spacer bar. The second transducer is
attached to the spacer at the index hole specified in Step 1.
3. Temporarily position the assembly (in the 9 o'clock position) at the location where you have deter-
mined it would be mounted. Ensure that it is a smooth area without any raised spots or seams.
Mark a generous area around the transducers (1/2" on either side and half again the length front
and back) with a pencil or chalk. Remove the assembly.
4. Prepare the two areas you marked by de-greasing the surface, if needed, and removing any grit,
corrosion, rust, loose paint or surface irregularities with the abrasive pipe conditioning material
provided. Clean the pipe of all debris and abrasive particles.
5. Remove transducer from the spacer bar that was attached through the REF hole. Put a mounting
strap around the pipe and engage an end into the adjusting screw (adjusting screw should be
pointing up). Apply a 1/8-inch continuous bead of couplant compound down the center (the long
way) of the contact surface of one of the transducers (see paragraph 3.3.5 Recommended Sonic
Coupling Compounds). Place the transducer on the pipe center in the middle of one of the areas
you have cleaned with its cable connector pointing away from the other cleaned area. Holding the
transducer in place, slide the mounting strap over it (and under the clip if there is one) and tighten
with a screwdriver. While tightening, check to ensure that the white dot under the front label is
centered on the pipe and that there is equal space on both edges. Also, make sure to position strap
for easy access to the mounting strap adjusting screw.
6. Repeat Step 5 with the second transducer leaving it still attached to the spacer bar. Apply a 1/8-inch
bead of couplant to the transducer. At the same time you place it in the middle of the second area
prepared, secure the spacing bar to the already mounted transducer by inserting the transducer
index screw through the REF hole on the Bar. Put mounting strap around transducer and tighten as
in Step 5. Sight along spacer bar to ensure axial alignment to the pipe. Adjust if necessary and do
not overtighten. Ensure that the transducers do not move while tightening.
7. Connect the transducer cable, ensuring that you have observed the upstream/downstream orien-
tation in respect to the cable and the input jack on the flow computer. If this is a dual-channel unit,
make sure you are connecting the cables to the correct channel's input jacks. Repeat this proce-
dure for the number index transducer.
8. Return to the menu, and press <ENTER> to finish the transducer install routine.
3.6.4 DIRECT MODE - MOUNTING FRAMES, SPACER BAR AND MOUNTING GUIDES
The combination of mounting frames, spacer bar and mounting guides is the recommended way to
mount Direct Mode transducers. The mounting frame establishes the axial alignment of the transduc-
ers, and allows you to remove and replace either transducer while preserving their exact mounting
location.
White Dot
Front View
3-30
1020NFM-1D
Transducer
Label
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