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Trawl Sounder

Type HC4-TS150

Advanced echo sounder in the trawl, showing fish influx and volume, the trawl opening and bottom distance.

  • 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
  • Used in pelagic and bottom trawling as well as Danish/Scottish seine
  • Ideal to pair with Door Sensors for a simplified trawl geometry
Scanmar Trawl Sounder, orange sensor housing

Advanced echo sounder

The TrawlSounder is an advanced echo sounder showing the height of the trawl opening, whether the trawl is on the seabed and the distance between the trawl and the seabed.

It also provides a simplified sonar that shows whether there is fish influx, and the volume. Choose between classic view and density view on your bridge system. Wireless monitoring of the trawl opening and intermediate section of the trawl has become a necessity in many of the world’s fisheries.

Mounted in the belly

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.

Technical specifications

Measurements

Trawl opening
1.5 – 150 m
Clearance
1.5 – 150 m
Fish density
0 – 9
Resolution
0.1 m / fat.
Accuracy
± 3 %

Operation

Update rate trawl opening
Approx. 11 sec
Update rate clearance
Approx. 8 sec
Update rate fish density
Approx. 8 sec
Max. depth
1200 m

Echo sounder

Frequency
96 kHz
Beam width
40 deg

Battery

Type
NiCd, 2 x 12V / 600 mAh
Charging time
1.5 hour (QBC-05)
Operation time
Approx. 20 hrs

Transmission

Frequency range
38.9 – 43.4 kHz
Source level
190 dB // 1uPa @ 1m
Beam width
55 deg (- 3dB)
Range to vessel
Approx. 2500 m (note 1)
Receiver
All except ScanCatch and MiniCatch

Weight

In air
5.9 kg
In water
1.9 kg

Main dimensions

Length
246 mm
Width
224 mm
Height
104 mm

Available options

Mounting kit
101879
Battery pack
105485 (2 pcs)
Battery charger
QBC-05
Dimension drawing of Trawl Sounder