TrawlSounder

  • Advanced echo sounder showing fish influx and volume
  • Measures the height of the trawl opening, whether the trawl is on the bottom and the distance between the trawl and the bottom
  • Applications: Pelagic trawl, bottom trawl, Danish/Scottish Seine
  • Ideal together with DoorSensors for showing a simplified trawl geometry

ADVANCED ECHO SOUNDER

The TrawlSounder is an advanced echo sounder showing the height of the trawl opening, if the trawl is on the seabed and the distance between the trawl and seabed. It also provides a simplified “sonar” that shows whether there is fish influx and the volume. Choose between “classic view” or “density view” on your Bridge System. Wireless monitoring of the trawl opening and intermediate section of the trawl has become a matter of necessity in many of the world’s fisheries.

Mounted in the belly it shows whether the trawl height is stable, or if a bucket effect is arising and allowing fish to escape. It also shows the volume of fish passing through. Together with a TrawlEye in the opening it is easy to see whether the fish seen entering the opening end up in the cod end.

TRAWL GEOMETRY

The TrawlSounder is ideal together with the Door-Sensors and the TrawlSpeed / Symmetry sensor to get full control of the trawl’s geometry.

echo

MEASUREMENTS

 

Echo sounder

 
Trawl opening 1,5 – 150 m Frequency 96 kHz
Clearance 1,5 – 150 m Beam width 40 deg
Fish density 0 – 9

WEIGHT

 
Resolution 0.1m In air 5,9 kg
Accuracy ± 3 % In water 1,9 kg

OPERATION

 

MAIN DIMENSIONS

 
Update rate trawl opening appx. 11 sec Length 246 mm
Update rate clearance appx. 8 sec Width 224 mm
Update fish density appx. 8 sec Height 104 mm
Operation time appx. 20 hrs

ENVIRONMENTAL

 
Max depth 1200 m Storage -20 til +55 °C

BATTERY

  Waste treatment of sensor According to WEE-Directive.
The sensor should, however, be treated as hazardous waste when the NiCd battery is in place
Type NiCd, 2x12 V / 600 mAh

APPROVALS

 
Charging time 1,5 hour CE  
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