Airmar DST800 User Manual

INSTALLATION INSTRUCTIONSOWNER’S GUIDE &

Thru-Hull, Retractable

TRIDUCER

Model DST800

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

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

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

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.

Multisensor

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

Part No._________________Date___________Frequency________kHz

plastic low profile P17 housing

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

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.

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.

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"

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

(plastic or metal housing in non-metal hull)

large displacement hulls

outboard and I/O

fin keel sailboats

planing hulls

small displacement hulls

stepped hull

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.

full keel sailboats

Figure 1.

Best location for multisensor

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").

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

bore up 30mm (1-1/4")

Figure 2. Anti-fouling paint

insert

outside wall below lower O-ring

paddlewheel cavity

paddlewheel

exposed end

housing

exterior flange of housing

plastic housing

P17

marine sealant on flange

and sidewall of housing

insert

cap nut

(plastic)

housing

safety wire

hull nut

washer

hull

B17

marine sealant on flange

and sidewall of housing

Figure 3. Bedding and installing

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

SS577

BOW ►

marine sealant on flange and

and isolation bushing where it contacts the hull

sidewall of housing

insert

cap nut

(plastic)

safety wire

housing

hull nut washer hull

(metal)

isolation ring

+ 2 hidden pages

Airmar DST800 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual