Simrad PI, Руководство по установке

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Simrad PI Catch monitoring system / Trawl hydrophone
12
851--164472 / Rev.B
degrees. To maximise coverage using two hydrophones when
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 the 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) to
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 failure. 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 1 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.