Airmar B122 User Manual

INSTALLATION INSTRUCTIONSOWNER’S GUIDE &

Thru-Hull, Retractable

Long-stem Sensors

Models: B122, DST800L, ST700

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

Follow the safety precautions below to reduce the risk of poor product performance, property damage, personal injury, and/or death.

WARNING: Always wear safety goggles and a dust

mask when installing.

WARNING: Fairing—The High-Performance Fairing requires an anti-rotation bolt. Failure to install the anti-

17-284-01 rev. 05 05/15/11

rotation bolt may result in the fairing rotating while the boat is underway. The effect may be violent movement and loss of steering.

WARNING: Fairing—The fairing must be installed parallel to the keel to ensure proper boat handling.

WARNING: Fairing—Do not install a fairing that has been mis-cut. Replace it. Failure to do so may result in the fairing rotating while the boat is underway.

- Cutting the fairing at an angle greater than the 35° maximum allowed will cut into the sensor and/or bolt pocket, thus weakening the fairing.

- Do not allow any gap between the fairing and the hull that is greater than 3mm (1/8"). When the boat is underway, water will enter any gaps and push against the fairing with considerable force.

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

PN:___________________Date___________Frequency_________kHz

B122

depth flush B122 housing

DST800L

TRIDUCER® Multisensor flush B122 housing

IMPORTANT: Read the instructions completely before proceeding with the installation. These instructions supersede any other instructions in your instrument manual if they differ.

ST700

speed & temperature low-profile B123 housing

Application

• Recommended for a thick hull.

• Bronze housing recommended for fiberglass or wood hull.

Never install a bronze housing in a metal hull because electrolytic corrosion will occur.

• Flush-mount accommodates a deadrise angle up to 10°.

• Fairing accommodates a deadrise angle up to 28°.

• Maximum hull thickness with 35° deadrise angle and fairing (measured perpendicular to the water surface): 47 mm (1-7/8")

WARNING: Do not over tighten the hull nut and nut on the anti-rotation bolt, crushing the hull and/ or fairing.

WARNING: The O-rings must be intact and well lubricated to make a watertight seal.

WARNING: The valve is not a watertight seal!

the insert or blanking plug is fully inserted into the housing, and the cap nut is screwed on completely.

Be sure

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.

CAUTION: Never install a metal sensor on a vessel with a positive ground system.

CAUTION: Never pull, carry, or hold the sensor by its cable; this may sever internal connections.

CAUTION: Never strike the sensor.

CAUTION: The arrow on the top of the insert must

point forward toward the bow when installed.

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.

Pretest

Connect the insert to the instrument and spin the paddlewheel if any. Check for the approximate air temperature and any speed reading . If there is no reading(s), check all the connections and repeat the test. If there is still no reading(s) or it is inaccurate, return the product to your 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 bits: 3mm or 1/8" (pilot hole)

11mm or 7/16" (anti-rotation bolt hole

Hole saw: 51mm or 2" (flush mount

57mm or 2-1/4"

Angle finder (some installations) Band saw (faring installation) Rasp or power tool (fairing installation) Sandpaper Mild household detergent or weak solvent (such as alcohol) Marine sealant (suitable for below waterline) Slip-joint pliers Mallet (some installations) Countersink tool (flush installation) Grommet(s) (some installations) Cable ties Installation in a cored fiberglass hull (see page 6)

Hole saw for hull interior:

Sensor: min. 60mm or 2-3/8" Anti-rotation bolt: min. 19mm or 3/4"

Cylinder, wax, tape, and casting epoxy

(installation with adapter ring)

large displacement hulls

outboard and I/O

fin keel sailboats

planing hulls

small displacement hulls

stepped hull

installation location and operating results of similar boats before proceeding.

• Fin keel sailboat—Mount on or near 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.

About the High-Performance Fairing

Nearly all vessels have some deadrise angle at the mounting location. If the sensor is mounted directly to the hull, the transducer beam will be tilted to the side at the same angle as the deadrise. A fairing is strongly recommended if the deadrise angle exceeds 10°.

• Orients the transducer beam straight down by mounting the sensor parallel to the water surface (see Figure 3).

• Mounts the sensor deeper in the water for clean flow under the transducer face.

• Long streamlined shape directs the water around the sensor to minimize drag.

full keel sailboats

Figure 1.

Best location for sensor

Mounting Location

CAUTION: Do not mount near water intake or discharge

openings, or behind strakes, fittings, or hull irregularities that will disturb the water flow.

CAUTION: Never mount the speed sensor directly ahead of a depth transducer, since turbulence generated by the paddlewheel’s rotation will adversely effect the depth transducer’s performance, especially at high speeds. Mount side-by-side.

• The water flowing under the hull must be smooth with a minimum of bubbles and turbulence (especially at high speeds).

• The sensor 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.

• If the sensor will be installed without a fairing, choose a location with a minimal deadrise angle, less than 10°, 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 insert. Allow a minimum of 200 mm (7-3/4") above the top of the housing.

Hull Types (see Figure 1)

• Displacement hull powerboat—Locate amidships near the centerline. The starboard side of the hull where the propeller blades are moving downward is preferred.

• Planing hull powerboat—Mount well aft, on or near the centerline, and well inboard of the first set of lifting strakes to ensure that the sensor 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

Anti-fouling Paint

Marine growth can accumulate rapidly on the sensor’s surface reducing performance in 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 plastics possibly damage the sensor.

It is easier to apply antifouling 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 (see Figure 2 ):

• Exterior flange of housing

• Bore of housing up 30mm (1-1/4")

• Insert and Blanking Plug:

- B122, Blanking Plug—Outside wall below lower joint Exposed end

- DST800L, ST700—Outside wall below lowest O-ring Any exposed end Paddlewheel Paddlewheel cavity

insert

B122/ Blanking Plug

exposed end

outside wall below lower O-ring

paddlewheel cavity

paddlewheel

exposed end

housing

(ST700 shown)

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

exterior flange

insert

ST700

outside wall below joint

outside wall below lowest O-ring

paddlewheel cavity

paddlewheel

insert detail

DST800L

Figure 2. Anti-fouling paint

WARNING

Installation of the anti-rotation bolt is mandatory in a High-Performance Fairing!

Failure to install the anti-rotation bolt may result in the fairing rotating while the boat is underway. The effect may be violent movement and loss of steering. This could result in serious injury or death to passengers and/or damage to the boat or other property.

Installation with Fairing: Suitable for B122, DST800L

Hole Drilling: Sensor

Cored fiberglass hull—Follow separate instructions on page 7.

1. Drill a 3mm or 1/8" pilot hole perpendicular to the waterline 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 51 mm or 2" hole saw, cut a hole from outside the boat (see Figure 3). Be sure to hold the drill plumb, so the hole will be perpendicular to the water surface.

Cutting the Fairing

CAUTION: The end of the fairing with the arrows/triangular recess always points forward toward the bow when installed. 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.

CAUTION: The housing must be flush with the fairing for smooth water flow under the sensor.

aft view

sensor

backing block

min. fairing

thickness

13mm (1/2")

transducer face

hull

slope of hull

deadrise angle

parallel to water surface

fairing

NOTE: fairing must be flush with housing

1. Measure the deadrise angle of the hull at the selected mounting location using an angle finder (see Figure 3). Check to be sure

the angle does not exceed the 35° maximum allowed.

2. Tilt the band saw table to the measured angle and secure the cutting fence (see Figure 4).

3. Place the fairing on the table so the cutting guide rests against the fence (see Figures 4 and 5). The end with the triangular recess will be pointing toward you for installation on the starboard side of the boat or pointing away from you for installation on the port side.

4. Adjust the cutting fence so the fairing will be cut in about two equal parts. The section that will become the fairing must be a minimum of 13mm (1/2") at its thinnest dimension (see Figure 3). Cutting the fairing at an angle greater than 35° will cut into the sensor and/or bolt pocket, thus weakening the fairing.

cutting

guide

cutting

fence

Figure 4. Cutting the fairing

band saw table

deadrise angle

end with arrow and triangular recess for installation on starboard side of hull

Figure 3. Measuring the deadrise angle

and fairing thickness

(B122 shown)

5. Recheck steps 1 through 4. Then cut the fairing.

6. When the boat is underway, especially at high speeds, water will enter gaps and push against the fairing with considerable force. Shape the fairing to the hull as precisely as possible with a rasp or power tool. If there is a gap of more than 3mm (1/8"),

replace the fairing.

7. Check to be sure the housing is flush with the fairing. If it is recessed more that 0.5mm (1/64") inside the fairing, you may shim the housing or carefully file/sand the fairing.

8. Use the remaining section of the fairing with the cutting guide for the backing block.

cutting

guide

triangular recess for anti-rotation bolt

Figure 5. High-performance fairing

+ 5 hidden pages

Airmar B122 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual