Simrad EQ33, Manual

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EQ33 Installation and service Chapter 9-11
Airmar B744V
Thru-hull triducer
Frequency: 50/200 kHz
Beam width: 45° / 15°
Cable length: 10m (32’)
Speed, tempe depth information.
Ref.no. 179-0401-009 (B744V)
Housing: Bronze
Recommended for fiberglass and
wooden hulls.
9.6.2 Determining the position for the transducer
The EQ33 is a sophisticated piece of electronic equipment, but how well it will
perform under actual operating conditions will be largely dependent upon the
location of the transducer and how it has been installed.
Careful consideration, therefore, must be given to selecting the mounting loca-
tion and on deciding the method of installation that best suits the vessel.
Air bubbles and turbulence caused by the vessel’s movement through the water
will seriously degrade the transducer’s performance. Therefore the transducer
should be located well clear of any water intake or discharge line and also
clear of any projection along the hull line which might disturb the smooth flow
of water. It is of profound importance for good performance of the EQ33 that
the water flowing over the transducer be free of bubbles and aeration. If the
transducer face is clean but the performance degrades with increasing vessel
speed, then aeration of the water flowing under the transducer may be the
cause of the poor performance.
Due to the varying design of ship’s hulls and different operating speeds, there
can be great variation in the amount of air bubbles which are carried beneath
the hull. These bubbles tend to be carried close to the hull as they pass aft. For
this reason, it is desirable for the transducer to be mounted on a fairing block