3-19
1010PVNFM-3A
Section 3
Tension Screw
Hook
Center of this link is over the
locating stud. An equal number of
links on either side of this stud
ensures 180
°
opposed installation.
Chain
Tension
Screw
Xdcr
Clamping
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
0
). Hold in place while
you wrap the chain 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 spacing guide around the pipe and against the end of the track
assembly. 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
0
until one track is in a 9 o’clock posi-
tion and the other in 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 trans-
ducer 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 connec-
tor 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,
corrosion, 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 compound 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.
