Simrad FS70 -, Руководство оператора, Страница: 81 / 114

FS 70 Installation Instructions
974-24007001/5.0
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4.3.6 Completing the Trawl Unit Assembly
First, the plastic cable strain relief supplied with the trawl unit must be bolted to the trawl
cable. The location should be at or very near the pigtail splice, but NOT on the pigtail
itself. You must slide the rubber hose on the trawl cable, if used, down so that
approximately 3.4 cm (1’.2") of the hose is clamped inside the strain relief.
Next, the trawl cable is connected to the sonar head. Liberal amounts of Dow Corning #55
grease are applied to the connector surfaces before mating so that a water tight seal is
obtained. The locking sleeve is then hand-tightened.
NOTE: Dow Corning “#55” grease must be applied to all mating surfaces of
underwater connectors to insure proper sealing. Sufficient grease should be applied
so that excess squeezes out with any air when the connectors are mated. RTV or any
other sealant must NOT be used, and when tightening the locking sleeves do NOT use
a wrench or pliers!
The plastic strain relief attached to the trawl cable is now placed in the trawl unit housing
containing the electronics and the excess cable is routed in the housing. Care must be taken
to insure that all cables within the trawl unit housing are properly placed to avoid being
pinched and possibly damaged. The top half of the trawl unit housing is then placed on top
and the two halves are secured together with the bolts supplied. Finally, the dome is secured
over the Vertical Sonar Head transducer with four additional bolts.
The fully assembled trawl unit is now ready for mounting to the trawl head rope in the chosen
manner.
4.3.7 Mounting the Catch Sensors
Proper mounting of the catch sensors on the cod-end is shown in drawing # 830-056482.
The fill of the cod-end and the sensitivity of the sensors are dependent upon the number of
mesh knots between the catch sensor and the rubber straps. Make sure that the sensor is
mounted in the correct direction with the transducer pointing towards the trawl unit (the
metal lid pointing aft).
WARNING: Make sure that the chains do not strain the net when the cod-end is being
filled with fish. This is controlled by stretching the net to capacity in the direction which
is relevant AFTER THE SENSORS HAVE BEEN MOUNTED TO THE TRAWL. The
purpose of the chains is to prevent the sensor from turning, and as an insurance against
loss should the rubber straps break. Mounting the chains too tight can result in the
fastening ears being ripped off.
If a system with four catch sensors has been ordered, sensors numbered 1 and 2 can be used
on the trawl and the other two sensors kept for reserve.