Airmar DST800 User Manual

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Applications

• Plastic housing recommended for fiberglass or metal hull only.

Never install a plastic housing in a wood hull since swelling of

the wood may overstress the plastic causing a fracture.

• Bronze housing recommended for fiberglass or wood hull.

Never mount a bronze housing in an aluminum hull because

electrolytic corrosion will occur.

• Stainless steel housing compatible with all hull materials.

Recommended for aluminum hull to prevent electrolytic corrosion

provided the stainless steel housing is isolated from the metal

hull.

• Accommodates up to 22° deadrise angle

Tools & Materials

Safety goggles

Dust mask

Water-based anti-fouling paint (mandatory in salt water)

Electric drill with 10mm (3/8") or larger chuck capacity

Drill bit: 3mm or 1/8"

Hole saw: 51mm or 2"

(plastic or metal housing in non-metal hull)

57mm or 2-1/4" (stainless steel housing in a metal hull)

Countersink tool (installing a flush housing)

Sandpaper

Mild household detergent or weak solvent (such as alcohol)

File (installation in a metal hull)

Marine sealant (suitable for below waterline)

Additional washer [for aluminum hull less than 6mm (1/4") thick]

Slip-joint pliers (installing a bronze housing)

Grommet(s) (some installations)

Cable ties

Installation in a cored fiberglass hull (see page 3):

Hole saw for hull interior: 60mm or 2-3/8"

Fiberglass cloth and resin

or Cylinder, wax, tape, and casting epoxy

17-355-01 rev. 06 12/14/10

Thru-Hull, Retractable

TRIDUCER

Multisensor

Model DST800

U.S. Patents: 6,904,798; 7,110,908; 7,352,171. UK Patents: 2 407 874; 2 409 527

Record the information found on the cable tag for future reference.

Part No._________________Date___________Frequency________kHz

plastic

low profile

P17 housing

INSTALLATION INSTRUCTIONSOWNER’S GUIDE &

Pretest

Connect the multisensor to the instrument and spin the

paddlewheel. Check for a speed reading and the approximate air

temperature. If there are no readings or they are inaccurate, check

all the connections and repeat the test. If there are still no readings

or they are inaccurate, return the product to the place of purchase.

WARNING: Always wear safety goggles and a dust

mask when installing to avoid personal injury.

WARNING: The O-rings must be intact and well

lubricated to make a watertight seal.

WARNING: Always attach the safety wire to prevent

the insert or blanking plug from backing out in the

unlikely event that the cap nut fails or is screwed on

incorrectly.

WARNING: Immediately check for leaks when the

boat is placed in the water. Do not leave the boat

unchecked for more than three hours. Even a small

leak may allow considerable water to accumulate.

WARNING: Stainless steel housing in a metal hull—

Be sure the washer contacts the hull. Do not tighten

the hull nut with the washer against the isolation

bushing, as the housing will not be firmly installed. If

necessary, sand the isolation bushing until the washer

rests against the hull.

CAUTION: Never install a metal multisensor on a

vessel with a positive ground system.

CAUTION: Never use a fairing with a plastic housing;

the protruding sensor would be vulnerable to damage

from impact.

CAUTION: Never pull, carry, or hold the multisensor

by its cable; this may sever internal connections.

CAUTION: Never use solvents. Cleaners, fuel,

sealants, paint, and other products may contain strong

solvents, such as acetone, which attack many

plastics, greatly reducing their strength.

CAUTION: Stainless steel housing must be isolated

from a metal hull to prevent electrolytic corrosion. Use

the isolation bushing supplied.

IMPORTANT: Read the instructions completely

before proceeding with the installation. These

instructions supersede any other instructions in your

instrument manual if they differ.

Mounting Location

CAUTION: Do not mount near water intake or discharge

openings, or behind strakes, fittings, or hull irregularities.

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

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

• The multisensor 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), other

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, so the

transducer beam will be aimed at the bottom.

• Choose an accessible spot inside the vessel with adequate

headroom for the height of the housing, tightening the nuts, and

removing the insert. Allow a minimum of 280mm (11").

Hull Types (see Figure 1)

• Displacement hull powerboats—Locate amidships near the

centerline. The starboard side of the hull where the propeller blades

are moving downward is preferred.

• Planing hull powerboats—Mount well aft, on or near the centerline,

and well inboard of the first set of lifting strakes to insure that the

multisensor will be 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 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 the

installation location and operating results of similar boats before

proceeding.

• 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 multisensor’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 installation, but

allow sufficient drying time.

Reapply paint every 6 months

or at the beginning of each

boating season. Paint the

following surfaces ( Figure 2):

• Outside wall of the insert

below the lower O-ring

• Paddlewheel cavity

• Paddlewheel

• Exposed end of the insert

• Exterior flange of the

housing

• Bore of the housing up

30mm (1-1/4")

• Blanking plug below the

lower O-ring including the

exposed end

planing hulls

Figure 1.

full keel sailboats

large displacement hulls

small displacement hulls

fin keel sailboats

Best location for multisensor

stepped hull

outboard and I/O

marine sealant on flange and

Figure 3. Bedding and installing

cap nut

washer

hull

plastic housing

safety wire

housing

hull nut

insert

marine sealant on flange

stainless steel housing in metal hullmetal housing in non-metal hull

isolation

ring

washer

sidewall of housing

(plastic)

marine sealant on flange

cap nut

hull

safety wire

housing

insert

(plastic)

(metal)

hull nut

BOW ►

and sidewall of housing

and isolation bushing where it contacts the hull

P17

B17

SS577

Figure 2. Anti-fouling paint

outside wall

paddlewheel

bore up

exterior flange

O-ring

below lower

cavity

30mm (1-1/4")

of housing

insert

housing

exposed end

+ 2 hidden pages