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Section 3
Chain
Tension
Screw
3. If this is a horizontal pipe, place the track with the chain tension screws on top of the pipe (screws
up, the chains hanging down and the numbered scale facing you) where you have determined it
would be best to mount it.
4. Place the other track (with the centering stud on the bottom and the lettering on the scale toward
the same side as the top track) directly underneath it (180
around the pipe; first onto the centering stud on the bottom track and then onto the hook under the
Tensioning Screw. With the chain in-place, count the number of links between the beginning of the
chain and the centering stud; and then between the centering stud and the hook. They both should
have the same number of links. Arrange so they do and then loosely tighten. Do the same with the
other chain. For a vertical pipe installation, it will probably be much easier to tie, tape or bungee cord
the two tracks in place while chaining.
5. Wrap a length of the Mylar Mounting Guide around the pipe and against the end of the track assem-
bly. Ensure that the edges on both sides align and tape to the pipe. Loosen the chains enough to
allow you to rotate the track assembly 90
a 3 o'clock position on the pipe (horizontal pipe). Tighten both chains but not too tight.
6. Insert an index pin into the REF hole of the track with the tensioning screws. Take one of the
transducers and insert it between the track rails and to the left of the index pin with the cable
connector pointing away from the pin. Move the transducer right until the pin stops it. Hold it in this
position and move the transducer clamping screw over the transducer and tighten. Insert the other
index pin into the index hole (see Step 1) on the other track marked "Direct Mode Spacing." Insert
the second transducer (with its cable connector pointing away from the pin) between the track rails
on the right side of the pin and move the transducer left until it's stopped by the pin and then follow
the same procedure as with the first transducer.
7. Mark a generous area around the transducers where they contact the pipe with a pencil or chalk.
Make a mark showing the center between the tracks on the mylar guide. Release the tension on the
transducers and remove them. Loosen the chains and rotate the track assembly on the pipe so you
can gain access to the areas marked.
8. Prepare the area you marked by degreasing the surface, if needed, and removing any grit, corro-
sion, rust, loose paint or surface irregularities with the abrasive pipe conditioning material provided.
9. Revolve the tracks on the pipe into the position they were originally in by using the edge of the mylar
guide as a stop for both the upper and lower tracks and the mark on the guide to center that track.
This time, before installing each transducer, apply a 1/8-inch continuous bead of couplant com-
pound along the center (the long way) of the contact surface of the transducer. Also, keep the
transducers lifted slightly from the pipe when installing until the transducer is against the pin; then
push down against the pipe. Remember to install the transducers with the cable connectors facing
away from each other.
Once the transducer is in place, Secure it with its clamping screw. Do not overtighten.
Tension Screw
Hook
0
). Hold in place while you wrap the chain
0
until one track is in a 9 o'clock position and the other in
3-38
1020NFM-1D
Center of this link is over the
locating stud. An equal number of
links on either side of this stud
ensures 180 ° opposed installation.
Xdcr
Clamping
Screw
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