1. MOUNTING
6
1.3.1 Installation considerations
To decide the location of the transducer, the following points should be taken into ac-
count.
• The most important matter is where the transducer is installed. The position should
be free from aeration possibly occurring beneath the hull and also not affected by
engine and propeller noise.
• It is known that air bubble streams start approximately from a quarter length of the
ship’s length from the bow, and spreads over the hull bottom approximately to three
quarters. Air bubble streams vary in form and intensity according to ship's speed,
draught, trim, shape of bow and hull, as well as sea state.
• In a laden ship, a position somewhere near a quarter of the ship's length from the
bow often gives satisfactory results. As for vessels such as oil tankers whose fore
draught is especially shallow, an after position about three quarters of ship's length
from the bow is often suitable.
• It is recommended to install the transducer on the keel line or between 600 mm and
900 mm from the keel to minimize the effect of aerated water.
• Sitting near obstructions such as the forward propeller, bow thruster, water intake
pipes and speed log signal should be avoided
• Select a place giving minimum mechanical vibration.
• Do not lay the transducer cable near or in parallel with other electric cables.
1.3.2 How to install the transducer (Example for TTF-5600)
Note: Be sure to remove the transducer and rubber gasket prior to welding the trans-
ducer tank to the hull.
1. Install the transducer tank on the hull. The tank bottom should be flush with the
hull bottom.
2. Feed the transducer cable through the cable gland.
3. Apply sealing tape to the threads of the gland nut for watertightness.
4. Pass the cable thru the gasket,
washer and gland nut.
5. Fix the transducer to the tank with the transducer fixing flange.
6. Coat the thread of gland nut with silicone grease.
7. Tighten the gland nut.
8. It is recommended to enclose the transducer cable in a conduit pipe for water-
proofing and electrical shielding as well as for protecting the cable from mechan-
Washer
(Flat face: Upside)
Gasket
Fixing flange
Gland nut
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