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FS 20/25 Operators Manual 901-10037001/1.1
FS 20/25 Installation, System Set-Up and Test Page 4.33
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
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 as
shown in Chapter 6 “Drawings”. 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 unit is 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 headrope in the
chosen manner.
4.4.19 Mounting CATCH SENSORS
Proper mounting of the catch sensors on the cod-end is shown in drawing # 830-
056482 (see chapter 6, “Drawings”).
The fill of the cod-end and the sensitivity of the sensors is 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).
Caution!
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.
For deep trawling, and when fish is abundant, it can be advantageous to mount three
or four catch indicators in such a way that cod-end filling can be monitored
continuously to insure that the trawl is hauled back in time.
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