Theory of Operation
974-24007001/5.0 5
deployment housing unit and contains the vertical sonar head, catch hydrophone receiver,
the optional forward hydrophone, the 200 kHz echo sounder transducer and depth and
temperature sensors. The mounting kit supplied contains the strain relief cable gland and
other hardware used to attach the trawl cable to the trawl head rope.
The trawl cable is connected to the trawl sonar by a watertight connector and a locking
sleeve.
1.8 Jointing Tool
Jointing tools and materials are required for splicing the trawl cable and attaching the trawl
“2 pin pigtail” connector to the trawl sonar. We recommend using 3M 72-N1 jointing tool
kits that can be purchase locally and are designed for coaxial cable with a breaking point of
1500kg. The jointing kit will allow you to make 1 cable joint.
NOTE: The size of the required joining and crimping sleeve will be determined by
the type of 3
rd
wire you are using.
1.9 Catch Sensors
The catch sensor “eggs” are wireless sensors mounted on the cod-end of the trawl net to
detect the stretch of the net as it fills up with the catch. When sufficient stretch of the net
occurs, the catch sensor is triggered and sends an acoustic signal to the trawl sonar through
the catch receiver. The information is then sent to the processor and displayed on the
monitor.
The sensors have a rugged construction in order to withstand the strain from winches and
the power block. The operator can use up to six sensors (with the 40 kHz system)
simultaneously. The catch sensors are equipped with rechargeable batteries.
1.10 PI Sensors Option
The FS 70 provides full integration with the PI System sensors. Door Spread, Net
Geometry, Bottom Contact, Rip Sensor and Cod End Depth Sensors available from Simrad
AS, Horten Norway.
1.11 Depth, Temperature & Sensors NMEA
Output
The FS 70 Processing Unit can be configured to output NMEA data information. The
integrated sensor module will output Depth, Temperature and PI Sensors data when
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