Airmar S650 - Manual (Page 2)

3. Sand and clean the area around the hole, inside and outside, to
ensure that the sealant will adhere properly to the hull. If there is
any petroleum residue inside the hull, remove it with either mild
household detergent or a weak solvent (alcohol) before sanding.
Metal hull—Remove all burrs with a file and sandpaper.
Bedding
CAUTION: Be sure the surfaces to be bedded are clean and dry.
Apply a 2mm (1/16") thick layer of marine sealant around the
flange of the housing that contacts the hull and up the sidewall of
the housing (see Figure 2). The sealant must extend 6mm (1/4")
higher than the combined thickness of the hull, washer(s), and
hull nut. This will ensure there is sealant in the threads to seal the
hull and to hold the hull nut securely in place.
Stainless steel housing in a metal hull—To prevent electrolytic
corrosion, the stainless steel housing must be isolated from the
metal hull. Slide the isolation bushing onto the housing. Apply
additional sealant to the surfaces of the bushing that will contact
the hull, filling any cavities in and around the bushing
Installing
CAUTION: If your sensor came with a connector, do not remove it to
ease cable routing. If the cable must be cut and spliced, use Airmar’s
splash-proof Junction Box 33-035 and follow the instructions provided.
Removing the waterproof connector or cutting the cable, except when
using a watertight junction box, will void the sensor’s warranty.
1. From outside the hull, push the housing into the mounting hole
using a twisting motion to squeeze out excess sealant (see
2
Figure 2. Bedding and installing (low profile housings shown)
retaining
bronze housing (B17 shown)
pin
safety ring (2)
marine sealant
paddlewheel insert
pull ring
safety wire
cap nut (plastic)
hull nut
washer
hull
emergency plug
on flange and sidewall
CAUTION: Do not mount in line with trailer rollers or bunks that
may damage the transducer’s face.
Turbulence-free water must flow under the paddlewheel at all
boat speeds. Choose an accessible spot inside the vessel. Allow
a minimum of 280mm (11") of headroom for the height of the
housing, tightening the nuts, and removing the insert.
• Displacement hull powerboats—Locate amidships near the
centerline.
• Planing hull powerboats—Mount well aft to ensure the sensor
is in contact with the water at high speeds.
• Fin keel sailboats—Mount on or near the centerline and
forward of the fin keel 300–600mm (1–2').
• Full keel sailboats—Locate amidships and away from the keel
at the point of minimum deadrise.
Anti-fouling Paint
Aquatic growth can accumulate rapidly on the sensor’s surface
reducing performance within weeks. Surfaces exposed to salt
water must be coated with anti-fouling paint. Use water-based
anti-fouling paint only. Never use ketone based paint, since
ketones can attack many plastics possibly damaging the sensor.
It is easier to apply anti-fouling paint before installing the sensor,
but allow sufficient drying time. Reapply paint every 6 months or
at the beginning of each boating season. Paint the following
surfaces (see Figure 1):
• Outside wall of the paddlewheel insert below the lower o-ring
• Paddlewheel cavity
• Paddlewheel
• Exterior flange of the housing and valve assembly
• Bore of the valve assembly up 30mm (1-1/4")
• Blanking plug below the lower o-ring including the exposed end
Installation
Hole Drilling
Cored fiberglass hull—Follow separate instructions on page 3.
1. Drill a 3mm or 1/8" pilot hole from inside the hull. If there is a rib,
strut or other hull irregularity near the selected mounting
location, drill from the outside.
2. Using the appropriate size hole saw, cut a hole perpendicular to the
hull from outside.
Flush housing—Use a countersink tool to create a ‘seat’ in the hull.
plastic housing (P17 shown) stainless steel housing (SS557 shown)
with marine sealant
isolation bushing
in metal hull
Figure 1. Anti-fouling paint
paddlewheel
cavity
paddlewheel
bore of
valve assembly
exterior flange
outside wall
paddlewheel
up 30mm (1-1/4")
insert
housing
lower o-ring
below
valve assembly
of housing and
Copyright © 1996 Airmar Technology Corp.
Copyright © 1996 - 2002 Airmar Technology Corp.