New Transducers B45 Manual De Usuario

outboard and I/O

CAUTION: Do not mount in line with or near water intake or 
discharge openings or behind strakes, struts, fittings, or hull 
irregularities that will disturb the water flow.

• The water flowing under the hull must be smooth with a 

minimum of bubbles and turbulence (especially at high speeds).

• The transducer must be continuously immersed in water.
• The transducer beam must be unobstructed by the keel or 

propeller shaft(s).

• Choose a location away from interference caused by power and 

radiation sources such as: the propeller(s) and shaft(s), 
machinery, other echosounders, and other cables. The lower 
the noise level, the higher the echosounder gain setting that 
can be used.

• Choose a location with a minimal deadrise angle.
• Choose an accessible spot inside the vessel with adequate 

headroom for the height of the stem and tightening the nut.

• CHIRP transducer—Mount in a cool well-ventilated area away 

from the engine to avoid overheating.

 (see Figure 1)

• Displacement hull powerboat—Locate 1/3 of the way along 

the LWL and 150–300mm (6–12") off the centerline. The 
starboard side of the hull where the propeller blades are moving 
downward is preferred.

• Planing hull powerboat—Mount well aft near the centerline and 

well inboard of the first set of lifting strakes to ensure that it is in 
contact with the water at high speeds. The starboard side of the 
hull where the propeller blades are moving downward is preferred.
Outboard and I/O—Mount just forward and to the side of the 
engine(s).

Inboard—Mount well ahead of the propeller(s) and shaft(s).
Stepped hull—Mount just ahead of the first step.
Boat capable of speeds above 25kn (29MPH)—Review 
transducer location and operating results of similar boats before 
proceeding.

• Fin keel sailboat—Mount to the side of the centerline and 

forward of the fin keel 300–600mm (1–2').

• Full keel sailboat—Locate amidships and away from the keel 

at the point of minimum deadrise angle.

IMPORTANT: If installing the transducer with NO fairing, 
disregard all references to a fairing and backing block.

1. Drill a 3mm or 1/8" pilot hole perpendicular to the waterline from 

inside the hull (see Figure 2). If there is a rib, strut, or other hull 
irregularity near the selected mounting location, drill from the outside.

2. Using the appropriate size drill bit, cut a hole from outside the 

hull. Be sure to hold the drill plumb, so the hole will be 
perpendicular to the water surface.

3. Sand and clean the area around the hole, inside and outside, to 

ensure the marine sealant will adhere properly to the hull. If there 
is any petroleum residue inside the hull, remove it with either a mild 
household detergent or a weak solvent (alcohol) before sanding.
Metal hull—Remove all burrs with a file and sandpaper.

WARNING: High-Performance Fairing—For your safety it is 
mandatory to follow the Installation Instructions that come with the 
fairing.

CAUTION: The arrow/pointed end of the fairing points forward 
toward the bow. Be sure to orient the fairing on the band saw, so 
the angle cut matches the intended side of the hull and not the 
mirror image.

1. Measure the deadrise angle of the hull at the selected location 

using an angle finder (see Figure 2)

2

Figure 1.

pressure waves

1/3

full keel sailboat

displacement hull

(6-12")

fin keel sailboat

150-300mm

LWL

Best location for the transducer

(Load Waterline Length)

stepped hull

planing hulls

hull nut

marine

backing block

Figure 2. Bedding and installing in a metal hull

6–12mm (1/4–1/2")

Standard Fairing

fairing thickness

hull 

(metal)

deadrise
angle

sealant

stem

Aft View

slope of hull

parallel to

waterline

cable

Copyright © 2005 - 2010 Airmar Technology Corp.

Copyright © 2005 - 2010 Airmar Technology Corp.

isolation sleeve

(SS258 with Standard Fairing shown)

transducer

inboard