Attachment_10_Hydrophone_InstallationManual_en_V2_0002.pdf

Hydrophone Installation Manual

Contents | ii

Contents

Legal History Copyright Disclaimer

Introduction and Presentation Introduction Safety Guidelines Technical Specifications About Hydrophones Installation Steps

Installation Planning the Hydrophone Installation

Potential Sources of Perturbation Planning the Installation for Purse Seining

Single Hydrophone Dual Hydrophones

Planning the Installation for Trawling Single Hydrophone Dual Hydrophones

Installation Options Installing the Hydrophone

Installing Thru-Hull Penetration Installing Blister for Seine Hydrophone Installing Shoes for Seine Hydrophone Installing Blister for Trawl Hydrophone Installing Shoes for Trawl Hydrophone Installing a Portable Hydrophone Hydrophone Cabling

Passive Hydrophone Passive Hydrophone + Wideband Preamplifier Active Hydrophone Active Wideband Hydrophone Scanmar Hydrophone Simrad PI Hydrophone Furuno Passive Hydrophone Simrad ITI Hydrophone Passive Hydrophone from other brands + Wideband Preamplifier Connecting the NMEA Converter Junction Box Receiving Hydrophone Data on Two Systems

Connecting the Hydrophone to the Receiver

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System Configuration and Display Adding Hydrophones to the Receiver

Servicing and Maintenance Cleaning the Hydrophones Interference Check

Spectrum Analyzer Display Checking Noise Interference

Estimating the Efficiency of Hydrophones Troubleshooting

Receiver page: hydrophones have bad streaming status How to identify a hydrophone without label

Support Contact

Appendix Technical Drawings

Hydrophone Dimensions Passive (NC-1-05) Active Narrowband (NC-1-04) Active Narrowband (NC-1-07) Active Wideband (NC 1-06 & NC 1-08)

Thru-Hull Penetration Dimensions Junction Box Dimensions NMEA Converter Junction Box Dimensions Wideband Preamplifier Dimensions Example of Dual Seine Hydrophone Mounting Equipment

Index

Hydrophones | V2 | Legal

Legal

History

V1 03/09/18 First release

V2 07/06/18

New topic:

• Estimating the Efficiency of Hydrophones on page 69: how to use the page Messages to check the efficiency of the hydrophones.

Improved topics:

• Active Wideband Hydrophone on page 48: for NC-1-08 hydrophones with serial number 4054875, 4054845, 4054831 and after, connect the -12V wire.

NC-1-08 hydrophones with a lower serial number need to be returned and replaced.

• Hydrophone Cabling on page 40: now includes guidelines on how to connect Marport hydrophones without using a junction box.

• Interference Check on page 65: more detailed information about Spectrum page.

Copyright © 2016-2017 Marport. All Rights reserved.

No part of this document may be reproduced, stored in a retrieval system or transmitted in any form by any means; electronic, mechanical, photocopying or otherwise, without the express written permission from Marport. “Marport ”, the Marport logo and Software Defined Sonar are registered trademarks of Marport. All other brands, products and company names mentioned are the trademark and property of its respective owners only. Marport is a division of Airmar Technology Corporation.

Disclaimer Marport endeavors to ensure that all information in this document is correct and fairly stated, but does not accept liability for any errors or omissions.

The present user guide is applicable for the following versions:

• Scala: 01.06.06-01.06.23

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Hydrophones | V2 | Introduction and Presentation

Introduction and Presentation Read this section to get a basic knowledge of your Marport hydrophones.

Tip: Click Marport logo at the bottom of pages to come back to the table of contents.

Introduction Marport hydrophones detect the signals from sensors installed on the net. The hydrophones can be installed on the hull or towed on a paravane. When hull-mounted, we recommend to install at least two hydrophones, one on each side of the vessel, to ensure uninterrupted reception. They can be used for purse seining and trawling.

Our hydrophones have dimensions that make them direct replacements for standard industry units.

We offer a large range of hydrophone types and configurations (passive and active options) to meet any fishing industry requirements.

Hydrophones also have a temperature sensor that gives you the temperature of the water surface.

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Safety Guidelines Important: To ensure proper and safe use of this equipment, carefully read and follow the instructions in this manual.

Basic good practices

When using the product, be careful: mechanical shocks can cause damage to the electronic components inside.

Never place the product in a hazardous and/or flammable atmosphere.

Do not lift a hydrophone by its cable.

Product installation and use

Install and use this product in accordance with this user manual. Incorrect use of the product may cause damage to the components or void the warranty.

CAUTION:

• Do not install the hydrophones until all hot work in the immediate area is complete, specifically welding and sandblasting.

• Do not use high pressure cleaners on the hydrophones.

• Do not hit, strike, pry, force, sandblast or otherwise subject the hydrophone to excessive force.

• Do not scrape the hydrophone with metal or other hard material that may damage the polyurethane housing.

• Do not paint the hydrophone. If necessary, use water-based anti-fouling paints only.

Never use metal-based nor ketone-based paints because they will deteriorate the polyurethane housing.

• Do not expose the hydrophone to harsh chemicals.

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Technical Specifications These are technical specifications for hydrophones currently sold by Marport. For information about obsolete hydrophones, please contact Marport support.

Product reference

Name Use case Bandwidth Typical current consumption Cable*

NC-1-05 Passive wideband hydrophone (no preamplifier)

• Vessel with very low level of noise (below -110 dBV).

• Sensors close to the vessel (approx. 300 m)

• For positioning systems with Slant Range/pinger (one passive hydrophone is necessary for transmission).

33-60 KHz 0.0 mA Blue

NC-1-05

NC-2-02

Passive hydrophone + Wideband preamplifier box

• Vessel with normal level of noise (below -100 dBV).

• Large number of sensors.†

• Use at great depths (> 500 m).

• Gain configurable (Low or High)

• Filters configurable (38 and/or 50kHz).

• Low noise environment between passive hydrophone and wideband preamplifier box

33-60 KHz 25-29 mA Blue

NC-1-04 Active hydrophone (integrated preamplifier)

• Vessel with normal level of noise (below -80 dBV).

• Limited number of sensors.†

• No filtering options.

• Not used for positioning system

38-45 KHz 8-12 mA Black

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Product reference

Name Use case Bandwidth Typical current consumption Cable*

NC-1-07 Active hydrophone (integrated preamplifier)

• Vessel with normal level of noise (below -100 dBV).

• Limited number of sensors.†

• No filtering options.

• Not used for positioning system

38-45 KHz 4-6 mA Green

NC-1-06 Active wideband hydrophone (integrated preamplifier)

• Vessel with normal level of noise (below -100 dBV).

• Large number of sensors.†

• Use at great depths (> 500 m).

• Gain configurable (Low or High)

• Filters configurable (38 and/or 50kHz)

30-60 KHz 25-29 mA Yellow

NC-1-08 Active wideband hydrophone (integrated preamplifier)

• Vessel with normal level of noise (below -100 dBV).

• Large number of sensors.†

• Use at great depths (> 500 m).

• Gain configurable (Low or High)

• Filters configurable (38 and/or 50kHz)

30-60 KHz 18-22 mA Yellow

*After NC-1-04, cables are colored according to the type of hydrophone: blue for passive, green for active narrowband and yellow for active wideband.

† Standard active hydrophones have an available bandwidth of 6kHz. So, if: (PRP_number * 100) + (NBTE_number * 800) < 6000 you have enough place. If: (PRP_number * 100) + (NBTE_number *

800) > 6000 then you need a wideband hydrophone.

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For all hydrophones:

Beamwidth @3dB

• When placed horizontally: horizontal beamwidth of 35° (55° for NC-1-05 when 1 cell is connected) and vertical beamwidth of 55°.

• When placed vertically: horizontal beamwidth of 55° and vertical beamwidth of 35° (55° for NC-1-05 when 1 cell is connected).

Cable length 25 m (50 and 75 m available on request)

Weight in air 5.4 kg

Paravane equipment

Weight in air with hydrophone: 17 kg

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About Hydrophones Hydrophones are installed on the hull of the vessel. They listen to the acoustic signals sent by the sensors placed on the fishing net, and convert them into electric signals to the receiver. The receiver transforms these signals so that data can be read and displayed on a screen with Scala software.

In some cases, for example when using a Slant Range sensor (trawl positioning system), the hydrophone can transmit signals to the net sensor, that will answer in return.

Hydrophones can be active or passive:

• An active hydrophone allows you to better receive signals from the sensors on the net, due to an integrated preamplifier that improves the signal over noise ratio (SNR) of signals from the sensors. An active hydrophone is also less sensitive than passive hydrophones to electrical noise near the cable.

• A passive hydrophone is especially used as a transmitting hydrophone in a positioning system with Slant Range sensors. When used as receiving hydrophone, the addition of a preamplifier to a passive hydrophone will improve the signal over noise ratio.

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Installation Steps Click an installation step to jump directly to the corresponding section.

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Hydrophones | V2 | Installation

Installation Read this section to know the guidelines regarding the installation of hydrophones on the vessel for purse seining and trawling.

Planning the Hydrophone Installation Read this section to have guidelines on hydrophone's angles, location and mounting arrangements.

The installation of the hydrophones must be carefully planned to ensure optimal operation of the system.

• Get information from experienced professionals: for example from the shipyard/installer if he has previous experience in hydrophone installation.

• Consult classification societies guidelines and rules that apply to the respective vessel. The guidelines in this manual are not intended to replace these standards.

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Potential Sources of Perturbation Before installing the hydrophones, you need to consider several factors that can interfere with the proper functioning of the hydrophones.

The placement of the hydrophones is very important to guarantee best operation of Marport's systems. When installing hydrophones, be careful to the following factors that disrupt the hydrophone reception. They can cause interference or completely block the hydrophone reception.

Most of them create air bubbles, that are an important source of disruption.

1 Sea surface: contains air bubbles along the hull, down to a depth between 3 and 10 meters.

2 Bow or stern thruster: creates air bubbles, also when not in operation. Minimum distance from hydrophone: 4 meters.

3 Active sonar and echo sounder transducers: transmit underwater signals. Minimum distance from hydrophone: 2 meters (if possible, avoid less than 1 meter). Avoid transducer's direct line-of-sight.

4 Water flow along the vessel hull: created when the vessel moves, it creates underwater acoustic noise. This flow becomes stronger near the stern, so it is recommended to install hydrophones on the forward 1/3 of the hull.

5 Main propeller: creates air bubbles that cause underwater acoustic noise. When propellers rotate clock-wise (applicable for majority of vessels), there is less noise on the port side of the vessel. Distance from hydrophone: as far as possible. Ideally 15 meters if vessel is long enough.

Avoid propeller's direct line-of-sight.

Underwater acoustic noise can also be created by objects such as main keels, zinc anodes, dents in the hull, keel coolers protruding from the hull, sea chests and tubes, water intakes and overboard discharges.

Also bear in mind that when a vessel is pitching in rough seas, it is important that the hydrophones installed on the forward part of the hull are not lifted out of the water. If this happens, acoustic reception is interrupted and the hydrophone may be damaged because of the repeated impacts with the water.

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Planning the Installation for Purse Seining You need to carefully plan the position of the hydrophone so it is efficient when fishing with a seine purse.

You can install one or two hydrophones. It is recommended to install two hydrophones to better receive signals from the sensors and to cover a larger area. If you use a purse seine that has a size above the average size with a large coverage area, we strongly recommend to use two hydrophones.

Note: The hydrophone can be placed horizontally or vertically:

Horizontally: signals are detected within a horizontal beamwidth of 35° (55° for NC-1-05 when 1 cell is connected) and within a vertical beamwidth of 55°.

Vertically: signals are detected within a horizontal beamwidth of 55° and within a vertical beamwidth of 35° (55° for NC-1-05 when 1 cell is connected).

Important: The hydrophone must have an unobstructed line-of-sight to Marport sensors attached to the seine net.

Single Hydrophone

Location

• Install the hydrophone on the side of the vessel where the purse seine is shot.

• If the main propeller rotates clockwise (applicable for majority of vessels), install the hydrophone on the port side. If it rotates counter-clockwise, install on starboard side.

• It is recommended to install the hydrophone at one-third of the vessel's waterline length from the bow, and no more than 50 mm higher than the lowest point on the keel.

Length of waterline

1/3 of waterline

As far as possible

ForeAft

≥ 4 m

Horizontal coverage

• The hydrophone must be directed at approximately the middle of the seine net.

• When the seine is placed forward of the beamwidth when pursing, you need to adjust the hydrophone angle:

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• If the seine net is pursed in the sector from approximately 0° to 120° relative to the bow, the hydrophone should be installed with an angle of 65° relative to the vessel's centreline.

• If the seine net is pursed in the sector from approximately 30° to 150° relative to the bow, the hydrophone should be mounted at an angle of 90° relative to the vessel's centreline.

ForeAft

55°

65°

Figure 1: Example of coverage with hydrophone placed vertically (view from below)

Vertical coverage

Install the hydrophone with a vertical tilt angle of 15° to 25°, so that the most important area of the seine net is covered:

• Short seine in deep water: 20°-25°

• Short seine in shallow water or large seine: 15°

S P

15-25°

35°

Figure 2: Example of coverage with hydrophone placed vertically (view from bow)

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The optimal tilt angle depends on the size of the seine net and of the heeling of the vessel:

Seine net length/ depth

250 / 50 350 / 100 650 / 150 850 / 180 1500 / 200 2000 / 200

Suggested tilt angles

15° 25° 20° 20° 15° 15°

Dual Hydrophones

Location

• Place the hydrophones according to the guidelines above.

• You can install both hydrophones in the same mounting arrangement using appropriate angles so that they can cover a bigger area.

Length of waterline

1/3 of waterline

As far as possible

ForeAft

≥ 4 m

Horizontal coverage

• When the seine is placed forward of the beamwidth when pursing, you need to adjust the hydrophone angle:

• If the seine net is pursed in the sector from approximately 0° to 130° relative to the bow, the forward hydrophone should be installed with an angle of 50° and the aft hydrophone with an angle of 90° relative to the vessel's centreline.

• If the seine is pursed outside this sector, adjust accordingly.

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ForeAft

50°90°

55°

Figure 3: Example of coverage with hydrophones placed vertically (view from below)

Vertical coverage

• Hydrophones should have vertical tilt angles of 15° to 25°. Each hydrophone should have slightly different tilt angles to provide a larger vertical sector coverage:

• Forward hydrophone: 25°

• Aft hydrophone: 15°

S P

15-25°

35°

15°

Aft

Forward

Forward

25°

Aft

Figure 4: Example of coverage with hydrophones placed vertically (view from bow)

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Planning the Installation for Trawling You need to carefully plan the position of the hydrophone so it is efficient when fishing with a trawl.

You can install one or two hydrophones. It is strongly recommended to install two hydrophones to better receive signals from the sensors, even when the trawl net is away from the vessel.

Note: The hydrophone can be placed horizontally or vertically:

Horizontally: signals are detected within a horizontal beamwidth of 35° (55° for NC-1-05 when 1 cell is connected) and within a vertical beamwidth of 55°.

Vertically: signals are detected within a horizontal beamwidth of 55° and within a vertical beamwidth of 35° (55° for NC-1-05 when 1 cell is connected).

Important: The hydrophone must have an unobstructed line-of-sight to Marport sensors attached to the trawl net.

Single Hydrophone

Location

• If the main propeller rotates clockwise (applicable for majority of vessels), install the hydrophone on the port side. If it rotates counter-clockwise, install on starboard side.

• It is recommended to install the hydrophone at one-third of the vessel's waterline length from the bow, and no more than 50 mm higher than the lowest point on the keel.

Length of waterline

1/3 of waterline

As far as possible

ForeAft

≥ 4 m

Horizontal coverage

Install with an angle of 10° relative to the centreline and toward the outside. With this angle, the beam of the hydrophone avoid the propeller 's noise. The picture shows a hydrophone installed on the port side.

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55°

10° ForeAft

Figure 5: Example with hydrophone placed vertically (view from below)

Vertical coverage

Install with a vertical tilt angle toward the bottom between 10° and 35°, according to the depth of the trawling gear:

• Shallow water trawling: 10° to 15°

• Middle-water trawling: 15° to 20°

• Bottom trawling: 30° to 35°

Port coverage area

35° 10-35°

Port

ForeAft

Figure 6: Example with hydrophone placed vertically

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The following table shows vertical tilt angles you can put, according to the distance of the hydrophone from the trawl and depth of the sensors.

Distance (m) from the trawl

250 500 750 1000 1250 1500 1750 2000

Tilt Depth of sensors (m)

10° 50 100 150 175 225 250 300 350

15° 70 150 200 250 350 400 450 535

20° 90 180 275 350 450 550 650 750

25° 120 225 350 450 600 700 800 925

30° 150 300 450 575 700 850 1000 1150

35° 175 350 525 700 875 1050 1200 1400

Dual Hydrophones

Important: If you have a positioning system, you must follow specific guidelines:

• The distance between both hydrophones (baseline) must be at least 1 m. The greater the baseline, the more accurate the position.

• Hydrophones need to be installed in an equipment deep enough to both receive signal.

• Install both hydrophones with an angle of 0° to 15° relative to the centreline and toward the outside. This way, they can both receive signal.

Location

• Install symmetrically the hydrophones on both sides of the vessel's keel. This way, under normal operating conditions, signals transmitted from the sensors attached to a trawl net can be received on both sides of the vessel's keel.

• If you cannot install symmetrically, the hydrophones can be installed at different distances from the bow. In that case, the hydrophone that is installed closest to the main propeller should be on the port side of the vessel. It must also have a greater vertical tilt angle than the other hydrophone.

Horizontal coverage

Install both hydrophones with an angle of 10° to 20° relative to the centreline and toward the outside. This way, their signals overlap each other on the horizontal plane.

Note: For positioning systems, we recommend an angle of 0 to 15° to make sure signals from the sensors are received by both hydrophones.

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55°

15°

Using keel shoes

Using blisters

ForeAft

Figure 7: Example with hydrophones placed vertically (view from below)

Vertical coverage

• Adjust the vertical tilt angle of the hydrophones according to the depth of the trawling gear. We recommend the following tilt angles:

• Shallow water trawling: 10° to 15°

• Middle-water trawling: 15° to 20°

• Bottom trawling: 30° to 35°

• Both bottom and shallow water trawling: install each hydrophone with a different angle.

• If the hydrophones are installed at equal distance from the bow, they need to have different tilt angles to cover a larger area. For example, port-side hydrophone can have a tilt angle of approximately 10° to 20° and starboard-side hydrophone can have a greater tilt angle of approximately 20° to 35°.

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ForeAft

Starboard coverage area

Port coverage area 35°

20-35°

10-20°

Port

Starboard

Figure 8: Example with hydrophones placed vertically

• If the hydrophones are installed at different distances from the bow, the aft hydrophone (closest to the main propeller) should be on the port side. In that case, port-side aft hydrophone should have a tilt angle of approximately 20° to 35°. Starboard-side forward hydrophone should have a smaller tilt angle of approximately 10° to 20°.

ForeAft

Starboard coverage area (forward)

Port coverage area (aft)

35° 20-35°

10-20°

Starboard

Port

Figure 9: Example with hydrophones placed vertically

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Installation Options You can install the hydrophones according to different methods.

Note: Respect the recommendations and orientation angles indicated in Planning the Installation for Purse Seining on page 14 and Planning the Installation for Trawling on page 18.

Blister

You can install blisters designed specifically for hydrophones. They can be installed on both sides of the keel, at a distance between 700 and 1200 mm from the keel. To reduce turbulence it is recommended to install the blister at the maximum distance.

Example of installation (view from stern):

If echo sounders are already installed in blisters, you can install the hydrophone blister next to them:

Important: Make sure to respect a minimum distance of 1 meter with the other equipment (the greater the distance, the less interference).

Keel mounted shoes

Hydrophones can be installed in shoes mounted off the main keel.

Tip: If you use both seine and trawl fishing, you can install the seine hydrophone on a shoe with one of the other hydrophones.

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Trawl hydrophone: Seine hydrophone (single): Seine hydrophone (dual):

Existing shoes

Hydrophones can be installed on the aft end of an existing keel mounted shoe or tank where underwater acoustic equipment is already installed.

Important: Make sure to respect a minimum distance of 1 meter with the other equipment (the greater the distance, the less interference).

≥ 400 mm

≥ 1000 mm

Other underwater acoustic equipment

Outer hull

Tank in aft-end of bulbous bow

You can install trawl hydrophones on the aft-end of a bulbous bow, especially for vessels trawling in deep water that need important tilt angles.

Important: if the vessel is pitching in rough seas, short signal interruptions may happen when operating and you may damage the hydrophone because of the repetitive impacts with the water.

Note: It is not recommended to install other underwater acoustic equipment at this location.

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Installing the Hydrophone This section contains drawings of mounting arrangements for hydrophones and cabling procedures.

Important:

• After installing the hydrophones, mark the location of the hydrophones directly above them on the vessel's hull, above the waterline. This will prevent the hydrophones from being damaged during dry docking.

• Also write the location of the hydrophones on the docking plans to make sure no block are placed near the hydrophones and their mounting arrangements.

Installing Thru-Hull Penetration You need to install thru-hull penetrations to pass the hydrophone's cables through the hull and to the junction box.

About this task

Standard hydrophone delivery does not include thru-hull penetrations: you need to order them separately (P/N TH-1-01 or TH-1-03).

If using two hydrophones, you need thru-hull penetration for both.

CAUTION: Remove the washers and rubber gasket from the thru-hull before doing any heat work (welding).

Procedure

1. Drill a hole in the hull to install the thru-hull penetration.

2. Run the steel conduit above the water line.

3. If you are welding, remove the washers and rubber gasket from the thru-hull beforehand.

Install the washers, gasket and hydrophone cable only after the heat work (welding) is completely cooled.

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Installing Blister for Seine Hydrophone

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Installing Shoes for Seine Hydrophone Shoe installation for steel hull

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Shoe installation for wooden hull

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Installing Blister for Trawl Hydrophone

Marport recommends to install a rope deflection plate around hydrophones' blister to protect them.

Vessels operating in cold climate should also install steel fins around hydrophones to protect them from ice damage.

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Installing Shoes for Trawl Hydrophone

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Installing a Portable Hydrophone You can use a portable hydrophone for trawling when you cannot install a hydrophone on the hull or you want to test a Marport system.

Before you begin You need a boom or gantry to tow the hydrophone at a minimum distance of 4 to 5 m outboard of the vessel. This distance is important to avoid interference from the main propeller. If you tow the hydrophone in the wake of the vessel, trawl monitoring system will operate poorly.

Procedure

1. Attach the paravane and hydrophone cable with appropriate rigging.

2. Depending on which side you deploy the paravane, install the steering wedge (black piece fixed at the rear) facing outward.

Paravane on port side Paravane on starboard side

3. Once in water, the portable hydrophone can go down to a few meters deep. If you want the hydrophone to go deeper, attach a weight to the paravane.

4. Attach the hydrophone cable to the vessel's bulwark.

5. Using a boom or gantry, deploy the portable hydrophone over the port or starboard side of the vessel, amidships, as far away from bow or stern thrusters as possible.

6. Lower the portable hydrophone below the level of high underwater noise and disruption created by the water flow along the hull.

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7. Tow the paravane at moderate speed: 4 knots maximum.

8. Haul back the paravane before a turn, so as it does not hit the vessel or propellers.

9. After each use, clean the hydrophone and paravane with fresh water and check that the hydrophone cable is not worn out. When storing, avoid sharp edges that could damage the hydrophone cable and never knot or twist the hydrophone cable.

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Hydrophone Cabling You need to connect the hydrophone to a junction box.

The following cabling instructions are for hydrophones currently sold by Marport: NC-1-04, NC-1-05, NC-1-06, NC-1-07 and NC-1-08.

For information about obsolete hydrophones, please contact Marport support.

Passive Hydrophone

We recommend the following wiring for the installation of the wideband passive hydrophone

NC-1-05.

Beamwidth:

• 55°x 55° : only connect cell with black + green wires

• 55° x 35°: connect both cells

Note: To be able to receive temperature from Marport hydrophones, on M3, M5 and M6 systems connect to the NTC hydrophone input H1 or H2, and on M4 system connect to the hydrophone input 1 or 2 using an NMEA converter junction box (P/N: NC-2-TEMP).

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If not using the junction box, wire directly the hydrophone to the cable 22-1265-01 the following way:

1. Wire / 2. Heat shrink / 3.

Welding point

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Passive Hydrophone + Wideband Preamplifier

We recommend the following wiring for the installation of a passive hydrophone NC-1-05 with a preamplifier NC-2-02.

About

The main functions of a preamplifier are:

• Allow signal filtering at 38kHz: configurable on/off

• Allow signal filtering at 50KHz: configurable on/off

• Filter signal out of 30-60KHz range: fixed

• Amplify signal in the 30-60KHz range: configurable low / high

By default the hardware configuration is Gain High / Notch filter 38 kHz / Notch filter 50 kHz.

The notches are activated by two wire straps that come with the preamplifier.

Preferably install the preamplifier as close as possible to the hydrophone and put the junction box as close as possible to the receiver.

Note: On recent versions of the preamplifier (PCBA 25-992-01 rev 03 and above) high and low gains have been reduced so that the output signal level is 12dB lower than with the previous version. Gains are now respectively 40dB and 20dB. This improves performance by reducing saturation with strong signals, especially in shallow waters.

Note: To be able to receive temperature from Marport hydrophones, on M3, M5 and M6 systems connect to the NTC hydrophone input H1 or H2, and on M4 system connect to the hydrophone input 1 or 2 using an NMEA converter junction box (P/N: NC-2-TEMP).

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Configuration 1

• Gain: High

• Notch filter 38kHz: On

• Notch filter 50kHz: On

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Configuration 2

• Gain: Low

• Notch filter 38kHz: On

• Notch filter 50kHz: On

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Configuration 3

• Gain: Low

• Notch filter 38kHz: Off

• Notch filter 50kHz: Off

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If not using the junction box, wire directly the hydrophone to the cable 22-1265-01 the following way:

1. Wire / 2. Heat shrink / 3.

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Active Hydrophone

We recommend the following wiring for the installation of the active hydrophones NC-1-04 and

NC-1-07.

Note: To be able to receive temperature from Marport hydrophones, on M3, M5 and M6 systems connect to the NTC hydrophone input H1 or H2, and on M4 system connect to the hydrophone input 1 or 2 using an NMEA converter junction box (P/N: NC-2-TEMP).

If not using the junction box, wire directly the hydrophone to the cable 22-1265-01 the following way:

1. Wire / 2. Heat shrink / 3.

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Active Wideband Hydrophone

We recommend the following wiring for the installation of the wideband active shielded hydrophone NC-1-06 and NC-1-08.

About

The preamplifier inside the hydrophone can be configured depending on the hydrophone wiring to the junction box. There are 4 different configurations:

First generation of

NC-1-06 (46-127-X)

NC-1-06 second generation (46-138- X) and NC-1-08 (46-139-X)

Configuration 1 38kHz and 50kHz filters activated / Gain High

38kHz filter activated / Gain High

Configuration 2 38kHz and 50kHz filters activated / Gain Low

38kHz filter activated / Gain Low

Configuration 3 38kHz filter activated / Gain High

38kHz and 50kHz filters activated / Gain High

Configuration 4 No Filters / Gain High 50kHz filter activated / Gain High

Note: To be able to receive temperature from Marport hydrophones, on M3, M5 and M6 systems connect to the NTC hydrophone input H1 or H2, and on M4 system connect to the hydrophone input 1 or 2 using an NMEA converter junction box (P/N: NC-2-TEMP).

Important: NC-1-08 hydrophones with a serial number before 4054875, 4054845, 4054831 do not use the -12V wire. These hydrophones need to be returned and replaced.

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Configuration 1

First generation 46-127-X Second generation 46-138-X / 46-139-X

38kHz and 50kHz filters activated / Gain High 38kHz filter activated / Gain High

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Configuration 2

First generation 46-127-X Second generation 46-138-X / 46-139-X

38kHz and 50kHz filters activated / Gain Low 38kHz filter activated / Gain Low

This configuration is recommended for seine fishing and trawling in shallow water.

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Configuration 3

First generation 46-127-X Second generation 46-138-X / 46-139-X

38kHz filter activated / Gain High 38kHz and 50kHz filters activated / Gain High

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Configuration 4

First generation 46-127-X Second generation 46-138-X / 46-139-X

No Filters / Gain High 50kHz filter activated / Gain High

If not using the junction box, wire directly the hydrophone to the cable 22-1265-01 the following way:

1. Wire / 2. Heat shrink / 3.

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Scanmar Hydrophone

We recommend the following wiring to connect a Scanmar hydrophone to a Marport system.

Scanmar hydrophones can be used with Marport receivers. They will show a lower current (5.5mA instead of 8-9mA).

If you want to receive temperature data from this hydrophone, connect the junction box to H3 port on M3 and M6 receivers or to H1 or H2 on an M4 receiver.

From Scala, Scanmar hydrophone can be added to the receiver as an active Scanmar hydrophone (typical current consumption is 5-6 mA).

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Simrad PI Hydrophone

We recommend the following wiring to connect Simrad PI hydrophone to a Marport system.

On Scala, Simrad PI hydrophone can be added to the receiver as an active Simrad hydrophone (typical current consumption is 15-17 mA).

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Furuno Passive Hydrophone

We recommend the following wirings to connect Furuno passive hydrophones to a Marport system.

There are three passive Furuno hydrophones, with different bandwidths:

• 31.5-34.5kHz

• 38-42kHz

• 47.5-52.5kHz

From Scala, Furuno passive hydrophone can be added to the receiver as a passive Furuno hydrophone, according to the bandwidth (33kHz, 40kHz or 50kHz).

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Simrad ITI Hydrophone

We recommend the following wiring to connect Simrad ITI passive hydrophone to a Marport system.

From Scala, this hydrophone can be added to the receiver as a passive Marport hydrophone.

Receiving (Rx)

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Receiving and transmitting (Rx + Tx)

Connect ITI cables to a junction box to receive (Rx) and to a preamplifier to transmit (Tx).

See Passive Hydrophone + Wideband Preamplifier on page 42 to know how to configure the gain and notch filters on the preamplifier.

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Passive Hydrophone from other brands + Wideband Preamplifier

You can connect passive hydrophones from other brands to Marport wideband preamplifier.

Passive hydrophones can be connected to Marport wideband preamplifier the same way Marport passive hydrophone is connected.

This drawing is an example of connection of a Furuno passive hydrophone with 1 cell.

See Passive Hydrophone + Wideband Preamplifier on page 42 to know how to configure the gain and notch filters on the preamplifier.

From Scala, add this hydrophone to the receiver as active - Hydro NC-1-03 or NC-1-05 +

NC-02-02.

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Connecting the NMEA Converter Junction Box

You can use an NMEA converter junction box to receive water temperature from the hydrophones if you do not have an NTC input.

NMEA converter junction box reference: NC-2-TEMP.

To receive water temperature information from Marport hydrophones on an M4 system, you need to use an NMEA converter junction box.

You can use the NMEA converter junction box on M3, M5 and M6 systems if you need to receive temperature from an hydrophone connected to H3 port.

M4 system: connect the standard junction box to H1 and H2 ports of the receiver.

M3, M5 and M6 systems: connect the standard junction box to H3 port on the receiver.

If a passive hydrophone is connected, there is no orange +12V nor green -12V wires from the hydrophone.

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Receiving Hydrophone Data on Two Systems

If you have two different systems, you can receive on both systems data coming from a hydrophone connected to one of the systems.

About this task The following procedure explains how to receive data on a Marport Mx system from an active hydrophone connected to another system.

Procedure

1. To receive data from a Scanmar system or another Marport system, connect a shielded multi-conductor cable as described below:

Scanmar / Marport receiver

Active hydrophone

Marport Mx receiver

Data received on Scanmar or other

Marport system

Data received on Marport Mx system

Powers

Block power with capacitors

+12V

Ground ShieldJunction box Junction boxPassive - Passive +

Shield

Primary system Secondary system

Important: Use ceramic capacitors of 10 μF/ 25V. They are necessary to block power supply.

Note: The primary system must be switched on in order for the secondary system to work.

2. To receive data from a Simrad PI system, connect a shielded multi-conductor cable as described below:

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Simrad PI receiver

Active hydrophone

Junction box

Marport Mx receiver

Data received on Simrad PI system

Data received on Marport Mx system

Powers Block power with capacitors

Passive - Passive +

Shield -12V

Ground Shield

+12V

Ground Junction box

Primary system Secondary system

Important: Use ceramic capacitors of 10 μF/ 25V. They are necessary to block power supply.

Note: The primary system must be switched on in order for the secondary system to work.

3. On the Mx receiver page, add the hydrophone as passive, because there is no power supply from this system.

4. To add sensors from other systems on Scala:

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a) Scanmar: add in the same way as for a Marport sensor, according to the type of sensor.

Only data sent on boat/channel codes can be read by the Mx receiver. When TE SC option is activated on your system, you can read all TE SC sensor data (add as Trawl Explorer SC Compatible).

b) Simrad PI: add as PI Sensor, according to the type of sensor. Only data such as catch status, depth, height,temperature and door spread can be read.

Results You receive data from the hydrophone on both systems.

Connecting the Hydrophone to the Receiver You need to connect the hydrophone to the receiver to be able to display sensor data received by the hydrophones.

Procedure

• Connect the extension cable of the junction box to a hydrophone input on the receiver:

• On M3, M5 and M6 systems: connect to the NTC hydrophone input H1 or H2 to be able to receive temperature from Marport hydrophones.

Note: H3 hydrophone input allows to receive temperature from an NMEA connection (Scanmar hydrophone or NMEA converter junction box). If you connect a Marport hydrophone to H3 without NMEA converter, you will not have temperature data from the hydrophone.

• On M4 system: using an NMEA converter junction box (P/N: NC-2-TEMP), connect to the hydrophone input 1 or 2 at the back of the receiver to be able to receive temperature from Marport hydrophones.

Note: Hydrophone inputs 1 and 2 allow to receive temperature from an NMEA connection, so you need an NMEA converter junction box. If you connect to other hydrophone inputs or have no NMEA converter, you will not have temperature data from Marport hydrophones.

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Hydrophones | V2 | System Configuration and Display

System Configuration and Display Learn how to add hydrophones to the receiver.

Note: This guide refers to the following versions of Scala: 01.06.06-01.06.23 . If you use another version, the visual interface and options may vary.

Adding Hydrophones to the Receiver You need to add hydrophones to the receiver to be able to display on Scala data received from the sensors.

Procedure

1. From the left side of the screen where the system is displayed, click Hydrophones.

2. To add a hydrophone to the system, click Click to Add on one of the hydrophones ports.

3. From the hydrophone selection page, scroll the top part to see the available hydrophones.

4. Click the picture of the correct type of hydrophone between active and passive, and the brand.

Note: When selecting an active hydrophone, you can see the hydrophone current displayed.

5. Click Ok.

The panel closes and the hydrophone is added to the Hydrophones page.

6. From the Hydrophones page, select a location for the hydrophone. The location is important when using a trawl positioning system.

7. For reference, you can also indicate vertical and horizontal tilt angles of the hydrophones.

8. Define an operating status. For normal sensor reception, select the Receive operating status.

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Hydrophones | V2 | System Configuration and Display

Number of hydrophone inputs

Red = active / Blue = passive

Hydrophone type

Frequency range

Horizontal beam width

Vertical beam width

Location (for positioning)

Horizontal tilt angle

Vertical tilt angle

Measured hydrophone current

Operating status

Note: If the hydrophone current is outside normal values, it is indicated with a red cross.

Refer to Technical Specifications on page 7 to know what are normal values.

Trouble: If an active hydrophone shows 0.0 mA current, it might be faulty or the wiring to the hydrophone might be wrong. Check the wiring.

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Hydrophones | V2 | Servicing and Maintenance

Servicing and Maintenance Read this section for troubleshooting and maintenance information.

Cleaning the Hydrophones You can check the hydrophones when dry docking the vessel.

Check if the hydrophones are clean. If not:

• Remove any marine life with a piece of wood.

• Wash away mud or debris with warm water.

CAUTION: Do not use highly abrasive materials or high-pressure cleaners.

CAUTION: Do not scrape the hydrophone with metal or other hard material that may damage the polyurethane housing.

Interference Check You can check if there is noise interfering with the reception of signals.

Spectrum Analyzer Display The following picture explains the main parts of the spectrum analyzer on Scala.

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1 Start/Stop spectrum analyzer

2 Noise interference

3 Pulses of the sensors (PRP)

4 Narrow band/HDTE signals

5 Door sounder signals

6 Pause spectrum analyzer

7 Select hydrophone

8 Drag to adjust color scale

9 Reset the Max line.

10 Marker: display frequency and levels of noise (dB) at the mouse pointer location on the graph.

11 Peak:

• RealTime: latest highest level of noise recorded.

• Max: highest level of noise recorded since the beginning of the spectrum.

12 Export recorded max, mean and real time noise levels in a txt file.

13 • Dark blue line: maximum signal level

• Cyan line: average signal level

• White line: last received signal level

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Checking Noise Interference You can use the spectrum analyzer to check the noise level of the hydrophones and check for interference.

About this task See Spectrum Analyzer Display on page 65 for details about the spectrum analyzer display.

Procedure

1. From the top left corner of Scala window, click Menu > Expert Mode and enter the password copernic.

2. Again in the menu, click Receivers.

3. From the top right corner of the screen, click Spectrum.

4. Select the hydrophone you want to test. Only the hydrophones that are switched on are displayed. Select refresh to update the list.

5. From the top left corner of the screen, click Start Spectrum.

The graph at the bottom of the page shows three levels of noise in dBV:

1. RealTime (white): level of noise recorded in real time.

2. Mean (cyan): mean recorded level of noise. It is useful to assess the noise floor.

3. Max (dark blue): shows the latest highest level of noise recorded. It is useful to see on which frequencies are the sensors.

The acceptable average level of noise depends on the conditions (distance from the sensor to the hydrophone, fishing method, type of hydrophone). You can have better performance with the following levels:

• Active wideband hydrophone with high/low gain: below -100 dBV

• Active narrowband: NC-1-04 below -80 dBV / NC-1-07 below -100 dBv

• Passive hydrophone: below -110 dBV

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6. To see the maximum, mean and real time measures of noise level at a specific frequency, select Marker on the left side of the screen and move the mouse over the graph.

Frequency and levels of noise (dB) at the mouse pointer location are displayed under Marker.

7. From Peak, you can check:

• RealTime: the latest highest level of noise recorded.

• Max.: the highest level of noise recorded since the beginning of the spectrum.

8. Check that there is more than 12dBV between the maximum noise level (dark blue line) and the average noise level (light blue line) on the peak of sensor frequencies.

9. If you changed the configuration of the hydrophone or sensors, click Reset Max to reset the dark blue line showing the maximum level of noise.

10. To save data recorded by the spectrum in a *.txt file, click Save FFT.

The FFT file lists for the entire bandwidth used by the hydrophone (frequencies are in Hz) the maximum and mean levels of noise since the FFT export has started and the last real time level of noise before the export (dBV).

11. When you have enough data, click Stop Spectrum.

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Estimating the Efficiency of Hydrophones You can use the page Messages to check the efficiency of the hydrophones.

1 Noise (dBv) You will have better performance with the following levels:

• Active wideband hydrophone with high/low gain: below -100 dBV

• Active narrowband: NC-1-04 below -80 dBV / NC-1-07 below -100 dBv

• Passive hydrophone: below -110 dBV

2 SNR • Above 20: SNR is correct.

• Between 12 and 20: SNR is too low.

3 Period of data This is the interval between 2 signals that have been well received. It should be 1 to 6 seconds for NBTE signals. For PRP signal, it should correspond to the telegram intervals.

4 ID of the sensor

This is the ID of the sensor transmitting data. To know the ID of a sensor, look at the parameter page of the sensor on the receiver page.

You can use this ID to filter the messages.

5 Hydrophone Number of the hydrophone.

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6 Autoswitch selection

• DIFFUSE: Hydrophone chosen by the autoswitch. The chosen hydrophone is the one having the higher SNR and least variation of data.

Received data are used in Scala.

• DELETED: = Data are received but they are not used in Scala.

7 Console Select to see hydrophone messages.

8 Filter Use to filter messages.

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Troubleshooting Read this section to know how to solve common problems.

Receiver page: hydrophones have bad streaming status

On the receiver page, one or several hydrophones have a BAD STREAMING status.

There is a communication issue between the Mx-Processor and the receiver.

1. From the left side of the receiver page, click Hydrophones.

2. From Rx/Tx, click the drop-down menu and select again the correct hydrophone configuration

(even if it is already selected).

The software updates the hydrophone configuration.

3. Check the status of the hydrophones on the receiver page. If the status stays on BAD

STREAMING, restart the computer.

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4. It is also possible that another application is using too much memory resource on the computer.

Open Activity Monitor and from the Memory pane, check how the memory is used. Close non-vital applications if needed.

How to identify a hydrophone without label

You do not know what type or which generation of hydrophone you have.

To identify if the hydrophone is passive, active narrowband or active wideband:

To know if it is a passive, active narrowband or active wideband, check the number of pairs of wires from the hydrophone cable:

passive 3 pairs active narrowband 2 pairs active wideband 4 pairs

To identify the generation of the hydrophone:

• For passive and active narrowband hydrophones, check the color of the cable:

NC-1-03 Black cable passive

NC-1-05 Blue cable

NC-1-04 Blue cable active narrowband

NC-1-07 Green cable

• For the active wideband hydrophone:

1. Check the labels: the first generation P/N is 46-127-X-01, the second generation P/N is 46-138-X-01. Other labels also tell you how to connect wires.

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2. If you do not have labels, you can use the following method:

Note: If the hydrophone is already installed on the vessel, this method may not work as well as expected.

1. Disconnect the white CMD and red CMD wires.

2. Open Scala and start a Spectrum.

3. Rub the face of the hydrophone.

4. Check the spectrum. When white and red CMD wires are disconnected, the first generation

46-127 does not have a notch filter and the second generation 46-138 has a notch filter at 50kHz. You should see it on the spectrum.

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Support Contact You can contact your local dealer if you need maintenance on your Marport products. You can also ask us at the following contact details:

FRANCE

Marport France SAS

8, rue Maurice Le Léon

56100 Lorient, France supportfrance@marport.com

ICELAND

Marport EHF

Fossaleyni 16

112 Reykjavik, Iceland supporticeland@marport.com

SPAIN

Marport Spain SRL

Camino Chouzo 1

36208 Vigo (Pontevedra), Spain supportspain@marport.com

USA

Marport Americas Inc.

12123 Harbour Reach Drive, Suite 100

Mukilteo, WA 98275, USA supportusa@marport.com

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Hydrophones | V2 | Appendix

Appendix Technical Drawings Hydrophone Dimensions

Passive (NC-1-05)

2 Post (release Q2 2015)

Shielded 4 Post (release Q3 2017)

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Active Narrowband (NC-1-04)

4 Post (release 2014)

2 Post (release Q2 2015)

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Active Narrowband (NC-1-07)

Active Wideband (NC 1-06 & NC 1-08)

NC 1-06 (Shielded 2 Post)

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NC 1-08 (Shielded 4 Post)

Thru-Hull Penetration Dimensions nut washer rubber gasket washer

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Junction Box Dimensions

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NMEA Converter Junction Box Dimensions

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Wideband Preamplifier Dimensions

Example of Dual Seine Hydrophone Mounting Equipment

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Index | 83

Index B

Bad streaming 71 Bandwidth 7 Blister

Examples 23 For Seine hydrophone 28 For Trawl hydrophone 34

C

Cable 7 Cleaning 65 Contact 74 Current 7

F

FFT

Export 67

H

Hydrophone

Active 47 Cabling 40 Dimensions 77 Furuno 55 Passive 40 Passive with wideband preamplifier 42 Scanmar 53 Simrad PI 54 Wideband active 48

J

Junction box

Cabling 40 Dimensions 79

K

Keel mounted shoes

Examples 23

N

NMEA converter junction box 62 NMEA Converter Junction Box

Cabling 59 Dimensions 80

Noise Interference 67

P

Paint 6 Parallel systems 60 Paravane, See Portable hydrophone

Perturbations 13 Portable hydrophone 38 Positioning system 18 Product reference 7 Purse seining

Dual hydrophones 14 Horizontal angle 14 Location 14 Single hydrophone 14 Vertical angle 14

R

Receiver

Adding to 63 Connecting to 62

S

Seine hydrophone 14 Shoes

Examples 23 For Seine hydrophone 31 For Trawl hydrophone 36

Spectrum 65, 67

T

Technical specifications 7 Thru-hull

Dimensions 78 Installation 26

Trawl hydrophone 18

Index | 84

Trawling

Dual hydrophones 18 Horizontal angle 18 Location 18 Single hydrophone 18 Vertical angle 18

W

Water ingress 6 Wideband preamplifier

Dimensions 81

Installation Options

Connecting the Hydrophone to the Receiver

Support Contact