Installation manual

Simrad PI54
90
851-165187 / Rev.A
trawling in both deep and shallow water tilt one preferably
15 degrees and the other preferably 30 degrees. The
hydrophone closes to the propeller should be tilted t he most
and care should be taken with regard to underwater acoustical
noise.
• Hydrophone cables pass through a vessel’s hull below its
water-line. It is therefore strongly recommended that a length
of conduit be fitted (using approve fastening procedures) t o
the interior of hull around the opening made for the
hydrophone’s cable. This conduit should extend vertically
(inside the vessel) over the water-line so that hydrophone
cables can be safely passed through the hull without the
danger of flooding in the event of gland failur e. Hydrophones
with steel through-hull fittings installed in this manner can be
replaced without the necessity of dry docking.
• The cable between the hydrophone and the cabinet must be
properly shielded from other potential sources of electrical
interference. A good practice is to run the hydrophone cable
in a steel conduit to the wheel house.
Figure 2 Recommended hydrophone locations
The illustration shows the recommended (A) and the alternative
(B) locations for single hydrophone locations. For a dual
installation, use position (A), and place the port hydrophone
further aft than the starboard. (L) is the total length of the hull
measured at the waterline.