Specifications

This type of transducer is very popular since it does not require the drilling of a hole such as the

through-the-hull transducer. However, you should consider the disadvantage due to the possible

loss of sensitivity which could cause a measurable depth loss in terms of maximum depth

capability. The success of inside the hull installation is also greatly dependent upon the purity of

the hull directly below the transducer and the type of hull.

When performing an inside the hull installation, you must use the special INSIDE THE HULL

TRANSDUCER since internal to the housing is a transducer crystal which is wider in inside

diameter that other styles of transducers and is designed to transmit the pulse through the hull.

Do not attempt to use a transom mount transducer as the crystal Is too small to insure optimum

instrument results.

Make sure that the transducer mounting location is at a point where a minimum of air bubbles

occur beneath the installation location. For example, do not choose an area above a lifting strake

because this is an area where air travels underneath the hull and could cause erroneous readings

or not allow the pulse to transmit and/or be received back to the unit.

DO NOT USE INSIDE THE HULL MOUNTING ON ALUMINUM, BALSA CORE OR WOODEN

HULLS, OR HULLS WHERE THE DEAD RISE ANGLE IS MORE THAN 15.

HOW TO INSTALL INSIDE THE HULL TRANSDUCER:

1. Select a relatively “thin” area of the hull. Avoid any built up areas that have been added to

strengthen the hull.

2. The transducer must be below the waterline and in an area where it will always have water

underneath its surface.

3. Mount in an area as flat and horizontal as possible. The greater the angle (deadrise) of the

hull, the greater the loss in sensitivity and maximum depth.

4. We recommend that you perform a test to determine the accuracy of readings before

permanently installing the transducer. Do this by either placing the transducer in a plastic

bag of water or putting axle grease on the face of the transducer. Then try the unit in this

location to ascertain the readings in shallow water and deep water.

5. After finding the optimum location, sand and clean the installation surface until it is smooth.

To insure a proper bond, clean and dry the bonding surface. Remove any oil residue on the

surface and clean an area roughly 4 inches in diameter. Finish this cleaning process by

wiping this area down at least twice with an acetone or lacquer thinner. DO NOT USE ANY

STRONG SOLVENTS IN CONTACT WITH THE PLASTIC OF THE TRANSDUCER SINCE

SOME SOLVENTS WILL WEAKEN AND DESTROY THE PLASTIC. Also make sure that the

ambient temperature is above 60° F (15°C).

6. MIX THE TWO PART EPOXY SUPPLIED WITH THE TRANSDUCER FOR AT LEAST 3

MINUTES. If this is not done, proper bonding of the transducer to the hull will not occur and

false readings can be caused.

INSTALLATION: INSIDE THE HULL TRANSDUCERS

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