Installation manual Simrad ES38-12 38 kHz split-beam transducer www.simrad.
Simrad ES38-12 Installation manual This document provides a general description of how to install the Simrad ES38-12 Split beam transducer. The information must be regarded as general guidelines and recommendations only. The installation shipyard must design and manufacture installation hardware to fit the ES38-12 transducer on each individual vessel. 344276/A 17.02.
Document history Simrad document number: 344276 / ISBN-13: 978-82-8066-119-7 / Current revision: A Rev.A 15.02 2010 First version. Copyright ©2010 Kongsberg Maritime AS The information contained in this document remains the sole property of Kongsberg Maritime AS. No part of this document may be copied or reproduced in any form or by any means, and the information contained within it is not to be communicated to a third party, without the prior written consent of Kongsberg Maritime AS.
Installation manual Table of contents ABOUT THIS MANUAL ....................................................... 5 SIMRAD ES38-12 .............................................................. 6 WHERE TO MOUNT THE TRANSDUCER ............................... 7 HOW TO INSTALL THE TRANSDUCER .............................. 11 Transducer installation in blister ............................................................................ 11 Use a mounting plate whenever provided ...................................
Simrad ES38-12 Example: Small transducer.......................................................................... 23 Example: Medium and large transducers ...................................................... 23 Example: Dual transducer arrangement ........................................................ 24 STEEL CONDUIT .............................................................. 25 TRANSDUCER HANDLING AND MAINTENANCE ................ 26 Rules for transducer handling..................................
About this manual About this manual Purpose The purpose of this installation manual is to provide the generic descriptions and illustrations that allows you to understand the basic principles for echo sounder transducer installation. About the information provided in this document The information in this document must be regarded as general guidelines and recommendations only. The installation shipyard must design and manufacture installation hardware to fit each individual transducer and vessel.
Simrad ES38-12 Simrad ES38-12 The purpose of this manual is the provide the basic information required to install the Simrad ES38-12 Split beam transducer.
Where to mount the transducer Where to mount the transducer A single answer to the question where to locate the transducer cannot be given. It depends very much on the vessel’s construction, how the hull is shaped and how the water runs along the hull. There are however a number of important guide lines, and some of these are even conflicting. Mount the transducer deep Mount the transducer at a deep position on the hull.
Simrad ES38-12 that the hull area around the transducer face is as smooth and level as possible. Even traces of sealing compound, sharp edges, protruding bolts or bolt holes without filling compound will create noise. Mount the transducer at the forward part of the hull to minimise the effects from the boundary water layer When the vessel forces its way through the sea, the friction between the hull and the water creates a boundary layer.
Where to mount the transducer Mount the transducer far away from the propellers The propulsion propeller is the dominant noise source on most fishing vessels, research vessels, merchant vessels and pleasure crafts. The noise is transmitted through the sea water. For this reason, the transducer should be placed far away from the propeller, which means on the fore part of the hull. Positions outside the direct line of sight from the propeller are favourable.
Simrad ES38-12 Figure 2 General recommendation for transducer location A Transducer B Inclination angle C Hull length at water line D Maximum 1/3 of the hull length at water line (C) If the vessel hull has a bulbous bow, this may well be a good transducer location, but also here must be taken into consideration the flow pattern of the aerated water. Often the foremost part of the bulb is preferable.
How to install the transducer How to install the transducer There are many different ways to mount the transducer. These are the recommended methods to mount a large and medium sized transducer using a mounting plate.
Simrad ES38-12 Example: Large circular transducer The illustration below shows a typical transducer blister designed for a large transducer. Note that due to the physical size of the transducer, a U-shaped support bar (E) is used to support the transducer. The purpose of this support is to prevent the transducer from being pushed up into the blister in heavy seas.
How to install the transducer Example: Medium and large transducers, principle Figure 5 Medium and large transducers using mounting plate This illustration shows the installation principle of a medium or large transducer using a mounting plate.
Simrad ES38-12 Common guidelines The best performance is obtained with a blister height of 40 cm or more. A streamlined shape and rounded edges reduce the flow noise. A vertical leading edge or front will guide the aerated water to the sides of the blister. The orientation of the blister should follow the water flow. The interior of the blister must be filled with sea water. Use drainage holes in the bottom and an air outlet on the top.
How to install the transducer Figure 8 Physical location of blister A Keel B Transducer blister C Horizontal distance between keel and blister D Vertical distance between the blister surface and the keel Observe the horizontal and vertical distances (C and D) between the keel and the transducer blister. On a medium sized vessel, the horizontal distance (C) should be approximately 1 meter. The vertical distance (D) must in general be as small as possible.
Simrad ES38-12 Example: Box keel installation Figure 9 Box keel installation The figure illustrates a symmetrical box keel installation.
How to install the transducer This can be accomplished by air release through a steel tube, which is extended either to open air 1.5 m above the water line or to the water outside the hull at a point higher than the tank interior. If the tube is extended to open air, drainage must be provided with leakage at the transducer flange or a separate hole in the tank bottom.
Simrad ES38-12 Example: Acoustic window Figure 11 Acoustic window A Steel tank B Oil C Acoustic window D Cable service loop E Stuffing tube F Cable in steel conduit G Oil inlet The transducer shown in the figure is mounted inside the tank behind a strong acoustic window. The window is typically made of polycarbonate. The tank is filled with oil. Transducer mounted inside the hull The transducer can also be mounted inside the hull.
How to install the transducer Make sure that the surface of the transducer face, the installation hardware used to mount it, the hull plating and the putty around the transducer is as even and smooth as possible. Obstructions on these surfaces will create problems with turbulent flow.
Simrad ES38-12 Retractable transducer Hull units allowing the transducer to be lowered and hoisted are commonly used for horizontal looking sonars. When not in use, the transducer is retracted into a trunk. Figure 14 Retractable transducer A Transducer B Trunk C Transducer shaft D Transducer shaft sleeve E Keel The retractable hull unit is more expensive than a blister, but on vessels with a hull where it is difficult or impossible to install a blister, it may still be worth while.
Towed body installation Towed body installation These are the recommended methods to mount transducers in a towed body. Topics • General requirements on page 21 • Installation in a towed body on page 22 General requirements Smooth surface is important Mounting screws or bolts must not be extruding from the transducer or the area immediately around it.
Simrad ES38-12 Installation in a towed body Transducers designed to withstand large water pressure are provided for use in towed bodies. The recommended installation method is through the hull plating hull using a mounting plate, or with mounting and clamping rings. The installation arrangement on the towed body must be designed by the manufacturer of the towed body to fit its shape and characteristics.
Towed body installation Example: Small transducer Figure 15 Small transducer with mounting and clamping rings A Mounting ring B Hull plating on towed body C Transducer D Clamping ring E Bolt This illustration shows the installation principle of a small circular transducer using clamping and mounting rings.
Simrad ES38-12 Example: Dual transducer arrangement Figure 17 24 Dual transducer arrangement This illustration shows a typical through the hull installation of small and large circular transducers on a towed body.
Steel conduit Steel conduit Why use steel conduits? It is strongly recommended to lay a steel conduit from the transducer’s cable gland to the echo sounder transceiver, and to pull the transducer cable through this conduit. There are several reasons for this. • It will make it easier at a later stage to replace the transducer. • Noise and interference from other electrical equipment is greatly reduced. • The risk of flooding is greatly reduced if the pipe is terminate above the water line.
Simrad ES38-12 Transducer handling and maintenance You MUST observe the following rules for handling, maintenance and painting. Topics • Rules for transducer handling on page 26 • Rules for transducer maintenance on page 27 • Approved anti-fouling paints for transducers on page 28 • Using self-locking taps on page 28 Rules for transducer handling Note Do not lift the transducer by the cable. Do not expose the transducer to direct sunlight. Do not expose the transducer to excessive heat.
Transducer handling and maintenance Cleaning the transducer face Whenever opportunity arise, for example when the vessel is dry docked, the transducer face may be cleaned for shells and other marine fouling. Be careful not to make cuts in the transducer face. Use a piece of soft wood or a very fine grade emery paper. Special rules for acoustic windows Arctic tanks have acoustic windows made of polycarbonate. These must neither be painted nor cleaned with chemicals.
Simrad ES38-12 Approved anti-fouling paints for transducers This is Simrad’s list of approved antifouling paints on polyurethane transducer housing. Jotun Head office address: P.O.Box 2021, N-3248 Sandefjord, Norway Website: www.jotun.com. 1 Racing 2 Non-stop 3 Safeguard Universal primer (125 micron) with Antifouling SeaQuantum Ultra (125 micron) 4 Antifouling Seaguardian International Marine Coatings Address: World-wide offices Website: www.international-marine.com.
Transducer handling and maintenance Introduction to Emuge self-locking threads Emuge self-lock is a tap design with an integrated locking feature. Standard metric bolts are used. The internal thread provides a self-locking connection, which can be used repeatedly. It is not necessary to involve a secondary locking device (e.g. chemical, nylon or mechanical). The Emuge self-lock bolts withstand vibrations better than standard (metric) threads, because the thread contact stops the sideways movement.
Simrad ES38-12 • Internal threads can be produced with Emuge taps, cold forming taps or thread mills • Larger thread hole diameters, i.e. increased tool life for threading tools • Larger tolerances for thread hole diameters Drawing standard Whenever self-locking threads are required, this is shown on the technical drawing. In the case of tapping through holes, the arrow at the end of the center line illustrates the screw-in direction of the bolt.
Transducer handling and maintenance Figure 20 Example of use Note In the case of tapping through holes it is important that the profile of the Emuge self-lock threads is in the correct direction compared with the entering direction of the bolt. Use Emuge self-lock gauges. Note that the gauge must be used in the correct direction. Self-lock taps provided by Simrad The following self-lock taps are on stock at Simrad, and can be ordered from us. Threads Drill diameter for threads Part.no M6 ø5.
Simrad ES38-12 Transducer cable splicing If you need to cut or lengthen the transducer cable, you must splice it correctly. The cable between the junction box and the transceiver must then be supplied by Simrad, and this must be the same type as used on the transducer(s). To splice the cable, use a metal junction box with EMC cable glands and a terminal block. The terminal block must provide solid fastening of the cable ends as well as sufficient insulation between the wires.
Drawing file Drawing file This chapter contains relevant drawings related to the electrical and physical installation of the Simrad ES38-12 Split beam transducer. Note The mechanical drawings are for information and guidance only. They are not in scale, and may differ slightly from the original drawings. All dimensions are in mm unless otherwise is noted. The original installation drawings are available on PDF and/or DWG (AutoCad) format. Visit www.simrad.com to download.
Simrad ES38-12 General Purpose Transceiver (GPT) wiring Observe the drawing below to connect the Simrad ES38-12 Split beam transducer to the General Purpose Transceiver (GPT). For more information about these connections, refer to the applicable echo sounder installation manual.
Drawing file General Purpose Transceiver (GPT) transducer plug assembly 344276/A 35
Simrad ES38-12 ES38-12 Outline dimensions and installation drawings Note When you fasten the transducer to the mounting plate, apply Loctite 270 on each bolt, and tighten the bolts several times. Use maximum torque 32 Nm.
Drawing file Outline dimensions [111337] 344276/A 37
Simrad ES38-12 Mounting plate [111492] 38 344276/A
Drawing file Installation principles [111495] 344276/A 39
Simrad ES38-12 40 344276/A
Index Index A E About, 5 information in this manual, 5 Acoustic window, 27 example, 18 installation, 17 Additional information, 5 Air outlet example, 12 Anti-fouling paint, 28 Approval maritime authorities, 5 EMC interference, 25 Emuge, 29 Example Acoustic window, 18 Air outlet, 12 box keel, 16 Clamping ring, 12, 23 flush mounting, 17 Inside the hull, 19 Mounting plate, 13, 23 Mounting ring, 12–13, 23 Streamlined blister, 12 J F B Blister Common guidelines, 14 installation, 11 physical location, 14 Bo
Simrad ES38-12 P Paint anti-fouling, 28 Painting transducer face, 26 Physical dimensions drawing, 37 Physical location blister, 14 Propeller noise, 9 Protruding objects, 7 Purpose this manual, 5 S splicing, 32–33 termination, 34 Transducer face cleaning, 27 painting, 26 Transducer plug drawing, 35 Transport protection, 26 W Water filled steel tank, 16 Wiring General Purpose Transceiver, 34 Self-locking taps, 29 Shielding steel conduit, 25 Simrad website, 5 Smooth surface, 11, 15–18, 21 Splicing transdu
Index 344276/A 43
Simrad document number: 344276 / Version A ISBN-13: 978-82-8066-119-7 ©2010 Kongsberg Maritime AS
