Section 3 Installation
35
Using a Thru-Hull Transducer
In place of the standard transom mount transducer you can also install a
thru-hull transducer as shown in Figure 3-11. Please read this section completely
before starting installation.
Normally, this type of installation is performed by a professional. You may
want to seek some local assistance before attempting to mount this type of
transducer.
CFT-2501HFA
Figure 3-11
Before You Install
➔ Do not install a bronze transducer housing directly into an aluminum or steel
hull due to electrolytic corrosion.
➔ Do not install the thru-hull then leave your boat in the water for any amount
of time without checking for leaks.
➔ Top speed capability is critical in positioning the transducer. For power boats
capable of more than 20 knots, check location and operational results on
similar boats before installing.
➔ Follow appropriate procedures for thru-hull mounting in core hull structures.
If you are in any doubt about installation, consult your boat representative, or
JRC dealer.
Selecting the Best Location
If properly installed the thru-hull transducer will be:
• where bubbles will not pass over the transducer face (especially at higher speeds).
Watch for bubbles caused by shaft struts, fittings, and other paddle wheel speed
transducers. Paint erosion on the hull is a sign of turbulence.
• continuously immersed in water. Mount well aft and close to the keel on high
speed power boats. Mount amidships and relatively close to the hull centerline
on displacement hulls. Mount forward of the fin keel on sailboats.
• where you can easily access the transducer from inside the vessel for adjustments
and periodic inspections-a minimum of 6" (152 mm) of headroom above the
transducer.
• where the transducer beam is not obstructed by keels or prop shafts.
Ø 79 mm
[3.13"]
133 mm
[5.24"]
2"-12 UN
threads
Ø 51 mm
[2.00"]
27 mm
[1.05"]
140 mm
[5.50"]
7 mm
[0.26"]
102 mm
[4.03"]
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