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eSonar is pleased to offer its customers a complete trawl management solution. No matter what type of trawling activity you are involved with, eSonar can provide the system you require. A complete listing of products is as follows:

•  Digital Receiver

•  Hull Mounted Hydrophone

•  Towed Hydrophone

•  The Linear Catch Sensor

•  Door Spread Sensors

•  Wing Spread Sensors

•  Headline Height Sensor

•  Multi-function Sensor (Depth, Temperature, Pitch And Roll)

•  Grid Sensor

•  Bottom Contact Sensor

 

DIGITAL RECEIVER

The receiver is the component of the system that can be installed on the bridge, engine room or any other convenient location on the vessel and receives information from the hydrophone. The Receiver is the interface between the user's display and the hydrophone. This unit is Ethernet based, thereby allowing multiple displays to be connected.

SPECIFICATIONS:

Dimensions:  8.0" L  x 5.5" W x  1.5" H

Power: 9-36 VDC 0.5A max

Connection: Serial Port (Ethernet available upon request).

2 Hydrophone Channels Port and Starboard

96kHz sampling rate

+12 VDC  phantom power to hydrophone preamps

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HULL MOUNTED HYDROPHONE

Hydrophones are either mounted on the hull or towed behind the vessel and receive acoustic signals from the sensors. The Hull Mounted Hydrophone has the preamp built in and is available in:

a one piece, single transducer model, or

a two piece, two transducer, full coverage system

 

SINGLE HYDROPHONE CONFIGURATION

Beam Width 50° horizontal, 50° vertical.

 

DOUBLE HYDROPHONE CONFIGURATION

Beam Width 50° - 80° horizontal, 50° vertical.

MATERIAL: Molded Epoxy and polycarbonate with

50 ft of shielded cable for attachment to the deck unit.

28 KHz receiver providing high sensitivity for reception over long distances.

 

ACCESSORIES

Housing

Thru-hull fitting

50 ft cable.

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TOWED HYDROPHONE

Towed Hydrophone is the versatile way to receive signals from the eSonar sensors. The towed hydrophone is normally deployed and towed from the side of the vessel in ice-free conditions. This unit is very popular on boats that do not plan to be in dry dock soon, or those that want to use the system on more than one vessel.

 

SPECIFICATIONS

Material: Polycarbonate housing and Molded Epoxy, 150 feet of Kevlar reinforced cable

Beam Pattern: 50° Conical

Accessories: 150 ft cable.

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LINEAR CATCH SENSOR

This sensor is used to monitor the catch rate of the trawl. When the cod end of the net expands due to the weight of the fish, the catch sensor cord is pulled causing the reading on the display to increase as the catch rate increases.

By allowing the catch rate to be monitored, the catch sensor can reduce wasted time towing with a full net, or continuing to tow when the net has passed through the body of fish. Also, by having pitch and roll available on the catch sensor, the user can reduce the occurrences of net damage due to rolling of the cod-end as the net fills. The user can install as many sensors on the net as desired to monitor the catch progress.

 

SPECIFICATIONS

Measurement: Net expansion/catch monitoring

Telemetry Frequency: nominal 28 kHz; programmable

Weight in air: 6 kg

Battery life: Up to 3 weeks for the basic sensor

Frequency: Programmable

Additional measurements (Optional): Depth, Temp, Pitch and Roll

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DOOR SPREAD SENSOR

Door spread sensors ensure that the doors are in alignment and the net is not skewed or collapsed on the bottom. The addition of depth, pitch and roll to the door spread sensors ensures the doors are working properly, thereby reducing the fuel consumption and towing duration. The correct door geometry is essential in order to ensure proper trawl performance.

 

SPECIFICATIONS

Measurement: Distance between master and slave sensor, door depth and door pitch/roll.

Measurement range: 300m

Accuracy: +/- 1% of full scale.

Measurement Frequency: nominal 90 kHz, programmable

Telemetry Frequency: nominal 28 kHz, programmable

Battery life: Up to 3 weeks for the basic sensor

Depth: 200 Bar

Pitch: +/- 180°

Roll: +/- 180°

Weight in air: Master, 6 kg; Slave, 6 kg

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WING SPREAD SENSOR

These operate in the same way as door spread, but are mounted on the wings of the trawl.

 

SPECIFICATIONS

Measurement: Distance between master and slave sensor.

Measurement range: 200m

Accuracy: +/- 1% of full scale

Measurement Frequency: nominal 150 kHz; programmable

Telemetry Frequency; nominal 28 kHz; programmable

Battery life: up to 3 weeks for the basic sensor.

Depth: 200 Bar

Pitch: +/- 180°

Roll: +/- 180°

Weight in air: 6 kg; Slave: 6 kg

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HEADLINE HEIGHT SENSOR

This sensor measures the distance from the headline to the footrope and from the headline to the bottom. This sensor is also able to measure depth, pitch, roll and temperature.

The Headline Sensor ensures the proper trawl opening is maintained and the trawl is fishing at its optimal shape, thereby improving catch and minimizing time and fuel consumption.

 

SPECIFICATIONS

Measurement: Distance from headline to bottom, Distance from headline to footrope

Depth: 200 Bar

Temperature: -2 to + 30° Celcius

Pitch: +/- 180°

Roll: +/- 180°

Height Measurement range: Up to 60m

Accuracy: +/- 1% of full scale.

Battery life: Up to 3 weeks for a basic sensor

Measurement Frequency: nominal 200 kHz; programmable

Telemetry Frequency: nominal 28 kHz; programmable

Weight in air: 6 kg

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MULTI-FUNCTION SENSOR

This sensor can report up to 4 parameters from a certain position on the trawl. Knowing these parameters will help achieve more effective harvesting of a particular species. Since many species prefer a narrow range of temperatures, this information can be extremely beneficial.

 

SPECIFICATIONS

Measurement: Water Temperature

Measurement Range: -2°C to +30°C

Battery life: Up to 3 weeks for a basic sensor

Depth: 200 Bar

Pitch: +/- 180°

Roll: +/- 180°

Accuracy: +/- 0.1°C

Weight in air: 6 kg

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GRID SENSOR

This sensor is mounted on the trawl grid using a mounting bracket and monitors the grid angle, thus allowing the skipper to make the necessary adjustments to his trawl in order to correct and maintain the optimum fishing angle. The Grid Sensor can perform angle measurements from 0° to 180° with an accuracy of � 1°. The sensor is powered by a rechargeable Lithium Ion battery which has an operating life of 400+ hours between charges. Like the other sensors, the Grid sensor can also monitor depth.

 

SPECIFICATIONS

Measurement: Tilt

Measurement Range: 0° to 180°

Battery life: Up to 3 weeks for a basic sensor

Depth: 200 Bar

Pitch: +/- 180°

Roll: +/- 180°

Accuracy: +/- 1°

Weight in Air: 6 kg

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BOTTOM CONTACT SENSOR

The Bottom Contact sensor is suspended vertically from the footrope of the trawl. When the trawl is off the bottom, the sensor hangs close to the vertical position, thus the bottom contact sensor will indicate approximately 90° showing that the trawl is not on the bottom. When the trawl is on the bottom, the sensor will be in a horizontal position and will indicate approximately 0°, showing that the trawl has touchdown.

 

SPECIFICATIONS

Measurement: Tilt

Measurement Range: 0° to 180°

Battery life: Up to 21 days for a basic sensor

Depth: 200 Bar

Pitch: +/- 180°

Roll: +/- 180°

Accuracy: +/- 1% Full Scale

Weight in Air: 6 kg

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21 Mews Place, St. John's, NL

Canada  A1B 4N2

Telephone: +1 709-726-0338

Cellular: +1 709 764-4345

Facsimile: +1 709-726-0348

sales@e-sonar.ca