Mounting The Transducer In A Hull With A Dead Rise - Raymarine DownVision CPT-70 Installation Instructions Manual

6.2 Mounting the transducer in a hull
with a dead rise
When mounting the transducer in a hull that has a
dead rise angle the transducer should be mounted
following the steps below.
Important: Do NOT remove the label attached
to the transducer cable as it contains important
information.
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3
1 Transducer cable
2 Vessel hull
3 Nut
4 Marine grade adhesive sealant — suitable for
submerged applications (not supplied)
5
Top half of Dead rise block
6
Bottom half of Dead rise block
7 Threaded Tube
8 Transducer
1. Align the bottom half of the Dead rise block so
that it is parallel to the centerline (keel) of the
vessel.
2. Using a permanent marker, draw around the
outside edge of the block and the internal hole
for the threaded tube.
3. Remove the block from the hull.
4. Drill a pilot hole in the center of the location
marked out on the hull for the threaded tube.
5. Drill the hole out using a suitable size hole cutter.
6. Using sandpaper and / or a file ensure there are
no rough edges or burrs.
7. Ensure all surfaces are clean and free from
debris.
8. Apply a thick bead of marine grade adhesive
sealant all around the edge of the top face of the
transducer and the bottom face of the Dead rise
block.
9. Apply a thick bead of marine grade adhesive
sealant up each side of the threaded tube,
ensuring that the sealant will protrude
approximately 6 mm above the final tightened
nut.
10. Feed the transducer cable through the dead rise
block's threaded tube hole.
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11. Push the dead rise block down onto the
transducer ensuring that the locators on the block
line up with the locator holes on the transducer.
12. Apply a thick bead of marine grade adhesive
sealant all around the edge of the top face of the
bottom half of the cut dead rise block, where it
will meet the hull.
13. Apply a thick bead of marine grade adhesive
sealant all around the edges of the hole in the
hull.
14. Guide the transducer cable and threaded tube up
through the vessel hull and ensure the transducer
is lined up with the markings made in step 2.
15. Apply a thick bead of marine grade adhesive
sealant all around the edge of the bottom face of
the top half of the cut dead rise block, where it
will meet the hull.
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16. With a person inside the vessel, place the top half
of the dead rise block over the threaded tube.
17. Apply a thick bead of marine grade adhesive
sealant all around the edge of the top face of the
top half of the cut dead rise block, where it will
meet the nut.
18. Apply a thick bead of marine grade adhesive
D12960-2
sealant to the bottom of the nut.
19. Ensuring that the dead rise block and transducer
do not move, secure the transducer assembly by
tightening the nut.
20. Hand tighten the nut and add a further quarter
turn using an adjustable wrench (spanner).
In order to prevent leaks and transducer
movement when hit by objects or waves, ensure
that the nut is adequately tightened. You should
see the sealant protruding from the edges of the
applied surfaces.
Do NOT overtighten. Overtightening can cause
damage to the transducer and hull which may
result in water leaking into the hull.
21. Remove any excess adhesive sealant.
22. Ensure that the sealant has fully cured before
putting the vessel back in the water.
Refer to the sealant manufacturers instructions
for curing times.
23. Once the vessel has been put back in the water
check for leaks immediately.
24. Check for leaks at regular intervals after
installation until you are satisfied that there are
no leaks.
25. Ensure checking for leaks around the transducer
is added to your routine vessel maintenance
schedule.
CPT-70 / CPT-80 / CPT-110 / CPT-120