1. MOUNTING
1-8
1.4 Transducer
The performance of this equipment is directly dependent on the installation of the
transducer. The installation of the transducer and the tank should be accomplished by
a dockyard referring to the installation drawings at the back of this manual.
Also, the transducer DS-820 which is used for DS-80 is available. For installation of
DS-820, see the installation manual (IME-72470) for DS-80.
1.4.1 Installation considerations
To decide the location of the transducer, the following points should be taken into ac-
count.
• Locate the transducer DS-8530 at least 2.5 m from the transducer of an echo
sounder.
Transducer, mounting location
• Separate as far as possible from air bubble sources; e.g., side thruster and water
disposal pipes.
• The Doppler speed log emits ultrasonic waves diagonally forward and backward, so
the transducer should not be located on the same line of the Doppler speed log in
the bow-stern direction.
• Install in close proximity to the keel, for uniform water flow.
The closer the ship is to the keel line, the more the water flow at the bottom of the
vessel creates an arrhythmic flow parallel to the keel, thus reducing errors in speed
measurement.
• Generally, best performance is obtained by mounting on the bow; the stern side is
influenced more easily by air bubbles and propeller cavitation.
• Never apply ordinary ship bottom paint to the transducer face. Whenever the ship
is dry docked, the transducer face should be cleaned, removing marine life and for-
eign material.
• For DS-784 (flush type), DS-786 (gate valve type) or DS-854 (ball valve type) trans-
ducer tank, remove the hose clamp of the transducer.
For DS-781 (projection type), the hose clamp is required even if it is removed tem-
porarily under installation.
• Do not remove the metal pipe on the outside of the transducer. Please mount the
transducer with the metal pipe attached to prevent reverberation.
STERN
BOW
2500 mm or more
Recommended location for
echo sounder transducer
ECHO SOUNDER TRANSDUCER
(a or b)
DOPPLER SPEED LOG TRANSDUCER
a
c
b
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