Simrad ES120-7C Transducer Installation Manual

Installation manual
Simrad ES120-7C
120 kHz split-beam transducer
www.simrad.com
TECHNOLOGY
FOR
SUSTAINABLE
FISHERIES
Simrad ES120-7C
Installation manual
This document provides a general description of how to
install the Simrad ES120-7C 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
ES120-7C transducer on each individual vessel.
330254/A
20 January 2009
Document history
Document number: 330254 / ISBN-13: 978-82-8066-106-7
Rev.A
January 2006
First version.
Copyright
©2009 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. The document, or any part of it, may not be translated to any other language without the
written approval from Kongsberg Maritime AS.
Disclaimer
Kongsberg Maritime AS endeavours to ensure that all information in this document is correct and fairly
stated, but does not accept liability for any errors or omissions.
Warning
The equipment to which this manual applies must only be used for the purpose for which it
was designed. Improper use or maintenance may cause damage to the equipment and/or injury
to personnel. The user must be familiar with the contents of the appropriate manuals before
attempting to install, operate or work on the equipment.
Kongsberg Maritime AS disclaims any responsibility for damage or injury caused by improper
installation, use or maintenance of the equipment.
Support
If you require maintenance on your Simrad product contact your local dealer. You can also contact us using
the following address: [email protected]. If you need information about our other products,
visit www.simrad.com. On our web site you will also find a list of our dealers and distributors.
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Installation manual
Table of contents
ABOUT THIS MANUAL ....................................................... 5
SIMRAD ES120-7C ............................................................ 6
WHERE TO MOUNT THE TRANSDUCER ............................... 7
HOW TO INSTALL THE TRANSDUCER .............................. 12
Transducer installation in blister ............................................................................12
Transducer installation in box keel.........................................................................17
Transducer flush mounted in a steel tank ...............................................................19
Transducer with acoustic window ..........................................................................20
Transducer mounted inside the hull .......................................................................21
Transducer mounted on a drop keel .......................................................................23
Retractable transducer ............................................................................................24
TRANSDUCER CABLE GLANDS AND SPLICING ................. 25
About cable glands .................................................................................................25
Cable gland for steel hulls ......................................................................................26
Cable gland for wooden and GRP hulls .................................................................27
Cable glands for small hulls ...................................................................................28
Transducer cable splicing .......................................................................................29
Order numbers ........................................................................................................29
STEEL CONDUIT .............................................................. 30
TRANSDUCER HANDLING AND MAINTENANCE ................ 31
Rules for transducer handling.................................................................................31
Approved anti-fouling paints..................................................................................31
Using self-locking taps ...........................................................................................32
DRAWING FILE ............................................................... 36
Echo sounder connections ......................................................................................36
Splicing the transducer cable ....................................................................... 36
General Purpose Transceiver (GPT) wiring................................................... 37
General Purpose Transceiver (GPT) transducer plug assembly ....................... 38
Outline dimensions and installation drawings........................................................39
Outline dimensions [204579]....................................................................... 40
Recommended arrangement [204678] .......................................................... 41
Mounting ring [204675] .............................................................................. 43
Clamping ring [204677] .............................................................................. 45
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Simrad ES120-7C
4
330254/A
About this manual
ABOUT THIS MANUAL
Purpose
The purpose of this installation manual is to provide generic
descriptions and illustrations allowing the reader 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.
Approval by maritime authorities
Whenever required, the installation shipyard must also have the
installation approved by the applicable maritime authorities.
Additional information
For additional detailed information about the transducer to
be installed, refer to the documentation provided with the
transducer. Drawings and descriptions can also be obtained from
http://www.simrad.com.
330254/A
5
Simrad ES120-7C
SIMRAD ES120-7C
The purpose of this manual is the provide the basic information
required to install the Simrad ES120-7C Split-beam transducer.
Transducer and documents
• Simrad ES120–7C: KSV-204580
• Product specification: 855–164381
• Drawings:
– Outline dimensions: 834-204579
– Mounting ring: 871–204675
– Clamping ring: 871–204677
– Mounting arrangement: 820-204678
Note
Although drawings are provided to explain the installation
principles, the installation shipyard must provide the final
drawings required to fit the transducer to each individual
vessel. Also, when applicable, the installation shipyard
must have the drawings and installation approved by the
proper maritime authorities. The drawings specific for
the ES120-7C transducer are located in the Drawing file
on page 36.
Technical specifications
Refer to the ES120-7C product specification.
Additional parts provided for installation
The following items can be supplied by Simrad to facilitate
installation:
• Mounting ring: ES1–204719
• Clamping ring: ES1–203672
• Transducer cable (for extension): 642–078215
6
330254/A
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. Consider the
situations when the vessel is unloaded, and when it is pitching
in heavy seas.
There are several reasons for this.
1 The upper water layers of the sea contain a myriad of small
air bubbles created by the breaking waves. In heavy seas the
upper 5 to 10 metres may be filled with air, and the highest
concentrations will be near the surface. Air bubbles absorb
and reflect the sound energy, and they may in worst cases
block the sound transmission altogether.
2 Another reason to go deep is the cavitation in front of
high power transducers. Cavitation is the formation of
small bubbles in the water due to the resulting local
pressure becoming negative during parts of the acoustic
pressure cycles. The cavitation threshold increases with the
hydrostatic pressure.
3 The transducer must never be lifted free of the water surface.
Transmitting into open air may damage the transducer
beyond repair. Mounting the transducer at a deep position
on the hull prevents this.
4 If the transducer is lifted up from the water during heavy
seas, it may be damaged when the hull strikes back at the
sea surface. This is especially important for low frequency
transducers with large faces.
Mount the transducer midway between the bow
and the stern to avoid heave effects
Heave is the up and down movement of the vessel. It disturbs the
echo traces in the echogram, so that a flat bottom is displayed
as a wave. A transducer location in the middle of the vessel
minimises the influence of vessel roll and pitch.
Mount the transducer away from protruding
objects on the hull
Objects protruding from the hull, such as zinc anodes, sonar
transducers or even the vessel’s keel, generate turbulence and
flow noise. Holes and pipe outlets are also important noise
sources. They may act as resonant cavities amplifying the flow
330254/A
7
Simrad ES120-7C
noise at certain frequencies. Do not place an echo sounder
transducer in the vicinity of such objects, and especially not
close behind them. For the same reason, it is very important
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. The
thickness of the boundary layer depends upon vessel speed and
the roughness of the hull. Objects protruding from the hull, and
dents in the hull, disturb the flow and increase the thickness of
the boundary layer. The flow in this boundary layer may be
laminar or turbulent. A laminar flow is a nicely ordered, parallel
movement of the water. A turbulent flow has a disorderly pattern,
full of eddies. The boundary layer increases in thickness when the
flow goes from laminar to turbulent. The figure below illustrates
the boundary layer of a vessel moving through the water.
Figure 1
Boundary water layer
A
Turbulent flow
B
Laminar flow
C
Air bubbles in the water
Furthermore, air bubbles in the sea water are pressed down below
the hull and mixed into the boundary layer. The boundary layer
is thin underneath the forward part of the vessel, and increases in
thickness as it moves towards aft. If the sides of the hull are steep,
some of the air bubbles in the boundary layer may escape to the
sea surface along the vessel sides. It is our experience that a wide
8
330254/A
Where to mount the transducer
and flat bottom, with a rising angle less than around 13 degrees,
is prone to giving air problems for the transducer. In any case a
transducer location in the forward part of the hull is preferred in
order to minimise the influence of the boundary layer.
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.
On small vessels with short distances it is advised to mount the
transducer on that side of the keel where the propeller blades
move upwards, because the propeller cavitation is strongest on
the other side. The cavitation starts most easily when the water
flows in the same direction as the propeller blade, and that is to
some degree the case at that side of the keel where the propeller
blades move downwards.
Mount the transducer far away from the bow
thrusters
Bow thruster propellers are extremely noisy. When in operation,
the noise and cavitation bubbles created by the thruster make
the echo sounder useless, almost no matter where the transducer
is installed. And when not in operation, the tunnel creates
turbulence, and if the vessel is pitching, the tunnel may be filled
with air or aerated water in the upper position and release this in
the lower position. In general, all transducers must be therefore
placed well away from the bow thruster. However, this is not
an invariable rule. Certain thruster designs combined with its
physical location on the hull may still offer suitable transducer
locations near the thruster. If you are in doubt, consult a naval
architect.
Mount the transducer with a slightly inclined
transducer face
Ideally, the transducer face should be mounted in parallel with the
sea surface when the vessel is in normal trim, as this will provide
the most accurate echo information. However, it is also very
important that the water flow over the transducer face is laminar.
In order to ensure laminar flow, the transducer face may be tilted
slightly upwards in relation to the water flow. This allows the
flowing water to meet the face directly, and assures laminar flow.
The inclination angle must however be determined carefully. The
angle must be small on transducers with narrow beam angles. As
a rule of thumb, mount transducers with beam angles smaller
than seven degrees with minimum inclination angle. The smaller
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9
Simrad ES120-7C
beam angle your transducer has, the smaller the inclination angle
can be. Ensure that you do not mount the transducer with a
negative inclination angle. This may cause turbulence under the
transducer face, and reduced echo sounder performance.
Summary and general recommendations
Some of the above guide lines are conflicting, and each case has
to be treated individually in order to find the best compromise.
Generally the propeller noise is the dominant factor, and a
recommended transducer location is in the fore part of the hull,
with maximum distance from the bow equal to one third of the
total length of the hull at the water line.
Figure 2
10
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)
330254/A
Where to mount the transducer
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.
Figure 3
hull
330254/A
Recommended location of the transducer on a bulbous
A
Thruster
B
Transducer location
11
Simrad ES120-7C
HOW TO INSTALL THE TRANSDUCER
There are many different ways to mount the transducer. These
are the recommended methods to mount a circular transducer.
Transducer installation in blister
With a transducer with circular housing, one recommended
installation method is by using a blister. The transducer blister
must be designed and manufactured by the installation shipyard
to fit the vessel’s size and hull shape.
Use mounting and clamping rings whenever
provided
Circular transducers may be provided with mounting and
clamping rings, or with drawings to allow for local production
of these. The mounting ring is welded to the hole prepared for
the transducer, while the clamping ring fits around the edge of
the transducer body. Bolts through the clamping ring into the
mounting ring will secure the transducer between them. Note
that several transducers use direction guides to allow correct
mounting.
Smooth surface is important
Mounting screws or bolts must not be extruding from the
transducer or the area immediately around it. 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.
Use a horizontal support bar on large transducers
We recommend that large transducers are fitted with a horizontal
support bar. The purpose of this support bar is to protect the
transducer from damage in the event of slamming. This happens
if the vessel hull climbs out of the water in heavy seas. The force
of the water when the hull falls down may push the transducer
up and cause damage to its mounting. The support bar can be
secured to the mounting ring using threaded rods.[1]
1.
12
Slamming is the impact of the bottom structure of a ship onto the sea surface. It is mainly observed
while sailing in waves, when the bow raises from the water and subsequently impacts on it. Slamming
induces extremely high loads to ship structures and is taken under consideration when designing ships.
(Wikipedia)
330254/A
How to install the transducer
Example: Large 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.
H
K
G
E
I
D
(CD017010A)
A
C
J
B
E
330254/A
F
A
Streamlined blister
B
Stiffening rib
C
Drainage holes
D
Inclination angle
E
U-shaped support bar (on large transducers)
F
Forward
G
Cable service loop
H
Stuffing tube
I
Minimum 400 mm
J
Rounded corners
K
Air outlet
13
Simrad ES120-7C
Example: Small transducer
The illustration below shows a typical transducer blister designed
for a small transducer. The same blister design principles as for a
large transducer apply.
E
E
A
B
(CD017010B)
F
G
C
D
A
Streamlined blister
B
Mounting ring
C
Clamping ring
D
Guide
E
Air outlet
F
Forward
G
Transducer cable
Note that the transducer cable must be provided with a cable loop
inside the blister. Observe the vertical forward edge of the blister.
This will guide the water to each side of the blister.
14
330254/A
How to install the transducer
Example: Medium sized transducer without
clamping ring
The illustration below shows a transducer blister designed for a
medium sized transducers. The same blister design principles
apply. Note that the transducer is mounted without a clamping
ring, which makes it necessary to use a different mounting ring
design.
E
E
A
F
B
I
D
G
H
C
(CD017010E)
A Streamlined blister
B
Mounting ring
C Bolt
D Self-locking threads
E
Air outlet
F
Forward
G Transducer cable
H Transducer
Note that the transducer cable must be provided with a cable loop
inside the blister. Observe the vertical forward edge of the blister.
This will guide the water to each side of the blister.
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15
Simrad ES120-7C
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. The
water pressure behind the transducer will then compensate for
the outside pressure during vessel movements in rough sea.
We recommend that large diameter transducers are fitted with a
horizontal U-shaped support bar. This bar can then be secured
to the mounting ring using threaded rods.
The transducer cable penetrates the hull in a stuffing tube. Leave
an adequate loop of the cable behind the transducer for easy
mounting or removal of the transducer.
Toe-in
The primary consideration must be to allow laminar water flow.
In most cases this is achieved by designing the blister in parallel
with the keel. However, if the blister is located close to the bow,
the front of the blister may have a few degrees toe-in towards
the bow.
A
C
B
(CD17010C)
16
A
Keel
B
Blister
C
Toe-in angle
330254/A
How to install the transducer
Physical location
The blister is placed on one of the sides of the hull, and the
distance from the keel is a trade off between a close distance
giving a turbulent flow of water in a narrow passage, and a large
distance bringing the transducer higher up and also more affected
by vessel roll. Normally a distance of approximately 1 m is a
good compromise.
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. This
is important to prevent the keel from shadowing the transducer
beam in shallow waters.
A
Keel
B
Transducer
blister
C
Horizontal
distance
between keel
and blister
D
Vertical
distance
between the
blister surface
and the keel
Transducer installation in box keel
Vessels with a box keel may use this for transducer installation.
The box keel is already the deepest part of the vessel. If the
box keel is too narrow to accommodate the transducer, it can be
widened, either symmetrically or to one side only. In the last
case the installation could also be described as a blister merged
into the keel.
Use mounting and clamping rings whenever
provided
Circular transducers may be provided with mounting and
clamping rings, or with drawings to allow for local production
of these. The mounting ring is welded to the hole prepared for
the transducer, while the clamping ring fits around the edge of
330254/A
17
Simrad ES120-7C
the transducer body. Bolts through the clamping ring into the
mounting ring will secure the transducer between them. Note
that several transducers use direction guides to allow correct
mounting.
Smooth surface is important
Mounting screws or bolts must not be extruding from the
transducer or the area immediately around it. 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.
Use a horizontal support bar on large transducers
We recommend that large transducers are fitted with a horizontal
support bar. The purpose of this support bar is to protect the
transducer from damage in the event of slamming. This happens
if the vessel hull climbs out of the water in heavy seas. The force
of the water when the hull falls down may push the transducer
up and cause damage to its mounting. The support bar can be
secured to the mounting ring using threaded rods.[2]
Example: Box keel installation
A
Box keel
B
U-shaped
support bar
(only required
on large
transducers)
C
Stuffing tube
D
Cable in steel
conduit
E
Cable service
loop
(CD1701 1A)
The figure below illustrates a symmetrical box keel installation.
D
C
B
E
A
2.
18
Slamming is the impact of the bottom structure of a ship onto the sea surface. It is mainly observed
while sailing in waves, when the bow raises from the water and subsequently impacts on it. Slamming
induces extremely high loads to ship structures and is taken under consideration when designing ships.
(Wikipedia)
330254/A
How to install the transducer
Transducer flush mounted in a steel tank
Flush mounting is used on very large vessels with a hull so deep
that no air bubbles are found below the hull, and on vessels
operating in shallow harbours or waters, where a protruding
blister can not be accepted.
The standard procedure for flush mounting on a steel vessel is
to weld a steel tank inside the hull, and mount the transducer
into this tank.
Use mounting and clamping rings whenever
provided
Circular transducers may be provided with mounting and
clamping rings, or with drawings to allow for local production
of these. The mounting ring is welded to the hole prepared for
the transducer, while the clamping ring fits around the edge of
the transducer body. Bolts through the clamping ring into the
mounting ring will secure the transducer between them. Note
that several transducers use direction guides to allow correct
mounting.
Smooth surface is important
Mounting screws or bolts must not be extruding from the
transducer or the area immediately around it. 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.
Use a horizontal support bar on large transducers
We recommend that large transducers are fitted with a horizontal
support bar. The purpose of this support bar is to protect the
transducer from damage in the event of slamming. This happens
if the vessel hull climbs out of the water in heavy seas. The force
of the water when the hull falls down may push the transducer
up and cause damage to its mounting. The support bar can be
secured to the mounting ring using threaded rods.[3]
Water filled
As for a blister, the interior of the tank must be filled with water.
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
3.
Slamming is the impact of the bottom structure of a ship onto the sea surface. It is mainly observed
while sailing in waves, when the bow raises from the water and subsequently impacts on it. Slamming
induces extremely high loads to ship structures and is taken under consideration when designing ships.
(Wikipedia)
330254/A
19
Simrad ES120-7C
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.
Example: Flush mounting in a steel tank
Transducer mounting in a steel tank is shown in the figure below.
A
Steel tank
B
Water
C
Drainage hole
D
Cable service
loop
E
Steel tube for
air outlet
F
Stuffing tube
G
Cable in steel
conduit
G
E
F
A
B
D
(CD17012A)
C
Transducer with acoustic window
Vessels operating in arctic waters need special attention on
transducer installation. Floating blocks of ice may damage even
a flush mounted transducer face. For this situation Simrad offers
arctic tanks in different sizes.
Use mounting and clamping rings whenever
provided
Circular transducers may be provided with mounting and
clamping rings, or with drawings to allow for local production
of these. The mounting ring is welded to the hole prepared for
the transducer, while the clamping ring fits around the edge of
the transducer body. Bolts through the clamping ring into the
mounting ring will secure the transducer between them. Note
that several transducers use direction guides to allow correct
mounting.
Smooth surface is important
Mounting screws or bolts must not be extruding from the
transducer or the area immediately around it. Make sure that the
surface of the transducer face, the installation hardware used to
20
330254/A
How to install the transducer
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.
Example: Acoustic window
The transducer shown in the figure below is mounted inside the
tank behind a strong acoustic window which could be made of
polycarbonate. The tank is filled with oil.
A
Steel tank
B
Oil
C
Acoustic
window
D
Cable service
loop
E
Stuffing tube
F
Cable in steel
conduit
G
Oil inlet
F
G
E
A
D
B
(CD017012B)
C
Transducer mounted inside the hull
The transducer can also be mounted inside the hull.
An installation of the transducer inside the hull, and sounding
through the hull, requires a good acoustic contact between the
transducer face and the hull. Build a tank around the transducer
and fill it with a liquid. Oil used in hydraulic systems is a well
suited liquid for this purpose. It contains no gas bubbles and
is non-corrosive.
Typical values of the two way loss are 3 dB for polyester, 6 dB
for aluminium and 10 dB for steel. Hulls made of wood or a
sandwich type with foam in the middle, attenuate the sound so
much that through hull sounding must be regarded as impossible.
The loss varies with the distance between transducer face and
the hull. The best result is obtained when the distance is half a
wavelength. Consult Simrad for advice. In addition to the loss,
the beam pattern is degraded, because a larger area of the hull is
set into vibrations.
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21
Simrad ES120-7C
Use mounting and clamping rings whenever
provided
Circular transducers may be provided with mounting and
clamping rings, or with drawings to allow for local production
of these. The mounting ring is welded to the hole prepared for
the transducer, while the clamping ring fits around the edge of
the transducer body. Bolts through the clamping ring into the
mounting ring will secure the transducer between them. Note
that several transducers use direction guides to allow correct
mounting.
Smooth surface is important
Mounting screws or bolts must not be extruding from the
transducer or the area immediately around it. 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.
Example: Mounting inside the hull
The transducer shown in the figure below is mounted inside the
hull. The tank is filled with oil.
A
Steel tank
B
Oil
C
Hull plating
D
Cable service
loop
E
Stuffing tube
F
Cable in steel
conduit
G
Hole for oil
filling
H
G
D
F
A
B
E
(CD017012C)
H
22
C
Air outlet
330254/A
How to install the transducer
Transducer mounted on a drop keel
The use of a drop keel with the purpose of stabilising the vessel
is well known.
A drop keel is also a superior platform for echo sounder
transducers. Such instrument keels have been built, mainly on
research vessels, often protruding as far as three meters below
the hull. At that depth, the water is free of air bubbles up to
very high sea states. The vessel is then able to perform reliable
acoustic measurements in open sea a larger part of the year.
A
B
(CD017012D)
C
A
B
C
330254/A
Instrument keel shaft
Lowered position
Bottom view
23
Simrad ES120-7C
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.
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. The principles of a hull unit
with a retractable transducer is shown below.
Vessels without a keel and with a wide, flat bottom is an example
where a retractable hull unit can be the only acceptable method
for bringing the echo sounder transducer below the boundary
layer.
A
Transducer
B
Trunk
C
Transducer
shaft
D
Transducer
shaft sleeve
E
Keel
D
(CD017012E)
B
E
C
A
24
330254/A
Transducer cable glands and splicing
TRANSDUCER CABLE GLANDS AND SPLICING
The transducer cable must pass through the hull using approved
cable glands for the type of vessel in question.
About cable glands
A steel cable gland is normally used on professional vessels
with steel hulls. A bronze cable gland can be delivered as an
option for vessels with wood or fibreglass hulls. Vessel not to be
classified can as an option use a cable gland made of plastic.
Note
Simrad strongly recommends that a length of conduit is fitted
around transducer cable glands made of steel or bronze and
extended over the water-line inside the vessel. This precaution
reduces the danger of flooding in the event of gland failure and
transducers installed in this manner are also easier to replace.
Some vessels may experience difficulties finding suitable areas
of the hull for mounting transducer cable glands due to existing
water tanks, concrete ballast or other obstacles. A possible
solution in such cases is to run the transducer cables in a steel
conduit aft along the hull until a suitable cable gland location is
available. The respective cable gland can then be installed as
described in the following instructions.
Note
Simrad takes no responsibility for the correct installation of
cable glands, associated hull modifications and/or structural
support of transducer cable penetration. These activities are
subject to individual approval by the respective classification
society for the vessel in question.
330254/A
25
Simrad ES120-7C
Cable gland for steel hulls
This cable gland kit is designed for steel vessels. It must be
welded to the hull plates.
F
ø35
A
A
ø65
B
C
D
C
E
(CD17008A)
A
Steel conduit
B
Stuffing tube, DNV approved carbon steel st52.3
C
Washers
D
Rubber gasket
E
Packing nipple. Make sure that you do not damage the
transducer cable by tightening the packing nipple too hard!
F
Cable to the echo sounder (or a junction box)
The cable gland kit includes all of the necessary parts needed to
install the unit except screws.
Simrad recommends that a one inch steel conduit (that the
transducer cable will be run through) with an inside threaded
diameter of three-quarter inches is welded to the gland’s stuffing
tube. The conduit must extend to above the vessel’s water line.
26
330254/A
Transducer cable glands and splicing
Cable gland for wooden and GRP hulls
A bronze cable gland kit is available for wooden and GRP
vessels.
F
A
E
B
C
B
C
D
C
B
(CD17008B)
A
Packing nipple. Make sure that you do not damage the
transducer cable by tightening the packing nipple too hard!
B
Washers
C
Rubber gaskets
D
Hole diameter 28 mm
E
Steel conduit
F
Cable to the echo sounder (or a junction box)
The cable gland kit includes all of the necessary parts needed to
install the unit except screws.
Simrad recommends that a one inch steel conduit (that the
transducer cable will be run through) with an inside threaded
diameter of three-quarter inches is attached to the gland’s packing
nipple. This connection must be watertight, and the conduit must
extend to above the vessel’s water line.
330254/A
27
Simrad ES120-7C
Cable glands for small hulls
This cable glands made of plastic is designed for those smaller
vessels that do not need to be classified.
J
A
B
A
C
D
E
F
(CD17008C)
G
H
I
A
Packing nut (bronze). Make sure that you do not to damage
the transducer cable by tightening the packing nut too hard!
B
Rubber gasket
C
Plastic disk
D
Rubber gasket
E
Stuffing tube
F
Backing nut (bronze)
G
Backing washer (plastic)
H
O-ring 42.5 x 3.0 N
I
O-ring 39.5 x 3.0 N
J
Cable to the echo sounder (or a junction box)
Stuffing tube hole diameter: 36 mm ±1.5 mm.
Apply ample amount of sealant between the backing washer (H)
and the hull plate.
The cable gland kit contains all the listed parts, except the sealant.
Note
The two O-rings must be clean, in good condition and free of cuts
or other defects which could affect their watertight integrity.
28
330254/A
Transducer cable glands and splicing
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. We
recommend that the cable screen is connected to the junction
box chassis using the EMC cable glands, but if you do this, the
junction box chassis must not be connected to vessel’s ground.
Note
Do not solder the wires together with only electrical tape for
insulation. This will result in electrical noise and reduced
operational performance.
Do not connect the cable screen to the vessel’s ground.
Order numbers
The cable glands described in this chapter are available as kits
from Simrad. Observe the following order numbers.
330254/A
Hull type
Item
Steel
Cable gland kit, steel, 499–037763
8 to 15 mm cables
Steel
Cable gland kit, steel, 305609
17 to 18,5 mm cables
Wood/GRP
Cable gland kit,
bronze
119-038200
Small
Cable gland kit,
plastic
599-202182
Order number
29
Simrad ES120-7C
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.
With a steel conduit the installation will satisfy the EU
regulations for EMC interference. Without a steel conduit, there
is a risk of reduced echo sounder performance.
Steel conduits qualities and shielding
The steel conduit must be unbroken and watertight from the
transducer to above the water line. From there, the cable can
be pulled further, or a junction box can be installed to facilitate
further connections. Note that the steel conduit must act as a
continuous electrical screen all the way.
Steel conduit dimensions:
• minimum 35 mm inner diameter
• minimum 6 mm wall thickness (4.5 mm if galvanised)
More that one transducer cable?
If two or more transducers are installed close to each other it is
possible to pull their cables in the same steel conduit, provided
the conduit diameter is increased accordingly. However, for easy
replacement it is recommended that each transducer has its own
steel conduit.
30
330254/A
Transducer handling and maintenance
TRANSDUCER HANDLING AND
MAINTENANCE
You MUST observe the following rules for handling,
maintenance and painting.
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.
Transport protection
Some transducers are delivered with a cover plate on the face
for protection during transport. Let this plate stay on as long as
possible, but do not forget to remove it before the vessel goes
into the sea.
Painting the transducer face
An anti-fouling paint may be applied to the transducer face.
Because some paint types may be aggressive to the polyurethane
in the transducer face, please consult Simrad’s list of approved
paints. See Approved anti-fouling paints on page 31.
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.
Acoustic windows must not be exposed to direct sunlight.
Approved anti-fouling paints
This is Simrad’s list of approved antifouling paints on
polyurethane transducer housing.
330254/A
31
Simrad ES120-7C
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
Wesite: www.international-marine.com.
1 Intersleek tie coat + 425 FCS
• BXA386/BXA390/BXA391 Grey
• HKA563/HKA570/HKA571 Yellow
• Mix BXA386, BXA390 and BXA391 first, then apply.
When dry, mix HKA563, HKA570 and HKA571, apply.
2 Intersmooth 360 Ecoloflex SPC
3 Micron Ekstra
Hempel IFA Coatings
Head office address: Hempel A/S, Lundtoftevej 150, Kgs.
Lyngby, DK-2800 Copenhagen, Denmark
Website: www.hempel.com.
1 Hempel A/F Classic 76550
Note
Refer to the manufacturer’s documentation and data sheets for
a complete procedure.
Using self-locking taps
Screw connections are generally made so that they can be
loosened again. However, accidental loosening, especially under
dynamic stress, must be avoided. For this reason it is often
necessary to use additional locking devices. These are often
expensive, they can be used once only, or react critically to
temperature changes.
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
32
330254/A
Transducer handling and maintenance
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. The special
design of the internal thread profile also provides a more even
distribution of the tightening stress over the whole thread length.
The assembly is just as easy as with a normal (metric) thread.
There is no general applicable standard (e.g. DIN standard) for
the Emuge self-lock thread.
Figure 4
Example, internal and external threads
A
B
C
2
1
(CD017020B)
A
Emuge’s saw-tooth profile up to pitch P ≤ 0.7 mm
B
Emuge’s saw-tooth profile up to pitch P ≥ 0.7 mm
C
Standard thread
1
External thread
2
Internal thread
The advantages of using Emuge self-lock thread include:
• The thread locking feature is integrated in the internal thread
• Modified profile with ramp surface in the direction of stress
• 30 degree ramp surface provides self-locking effect
• Easy assembly
• No assembly errors (forgetting the locking device) possible
• Use of standard external threads (screws) with tolerance class
“medium”
• Even distribution of stress over the whole thread length
• No stripping of threads
• Economically efficient locking system, no additional
components are necessary
• Undiminished holding power even under dynamic stress
• Repeated loosening and re-tightening without loss of function
330254/A
33
Simrad ES120-7C
• 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.
Figure 5
Drawing examples, self-locking thread
M8 SL*
M10 SL*
(CD017020A)
The drawing is normally provided with the following text (or
similar):
Note: The self-lock threads marked with SL* must be made in
accordance with procedure 842–202125. Drill diameters for
threads differ from standard. Self-lock taps can be supplied by
Simrad.
Taps
The pretension locking thread self–lock (taps) from manufacturer
Emuge must be used.
34
330254/A
Transducer handling and maintenance
Figure 6
Example of use
(CD017020C)
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.
Gauge
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
ø5.2
700-078838
M8
ø7.0
700-078531
M10
ø8.8
700-078408
M12
ø10.7
700-078409
M16
ø14.5
700-078410
Supplier and manufacturer
Norwegian supplier is:
Tingstad AS, P.O.Box 83, Kalbakken, 0902 Oslo, Norway
http://www.tingstad.no
Manufacturer is:
EMUGE-Werk Richard Glimpel, Nurnberger Strasse 96-100,
D-90607 Lauf, Germany
http://www.emuge.de
330254/A
35
Simrad ES120-7C
DRAWING FILE
This chapter contains relevant drawings related to the electrical
and physical installation of the ES120-7C Split-beam transducer.
Note
The mechanical drawings are for information and guidance only.
They are not in scale. All dimensions are in mm unless otherwise
is noted.
The original installation drawings are available on PDF and/or
AutoCad format. Visit www.simrad.com to download.
Topics
•
Echo sounder connections on page 36
•
Outline dimensions and installation drawings on page 39
Echo sounder connections
Observe the following information related to electrical
connection of the ES120-7C Split-beam transducer.
Topics
•
Splicing the transducer cable on page 36
•
General Purpose Transceiver (GPT) wiring on page 37
•
General Purpose Transceiver (GPT) transducer plug
assembly on page 38
Splicing the transducer cable
If you need to splice the transducer cable, it is very important
to use the correct cable, and to avoid ground loops. We strongly
recommend the use of a junction box. We also recommend that
you install the transducer cable in a steel conduit.
Related topics
36
•
Transducer cable splicing on page 29
•
Steel conduit on page 30
•
General Purpose Transceiver (GPT) transducer plug
assembly on page 38
330254/A
Drawing file
General Purpose Transceiver (GPT) wiring
Forward
3
4
2
1
Port
B
Starboard
A
M
C
L
D
Sections seen from top
of the transducer
330254/A
F
H
J
Junction Box (1:1)
(Optional)
1
White
Black
Blue
Black
Blue
White
Channel 1
H
J
2
White
Black
Blue
Black
Orange
White
Channel 2
E
F
3
White
Black
Blue
Black
Green
White
Channel 3
C
D
4
White
Black
Blue
Black
Brown
White
Channel 4
A
B
Screen
W802-4
Rev.E
K
E
Transducer
cable
GPT Transducer
socket
N
Alternative cable
colours
Connect to plug housing
Single frequency , split beam termination
37
Simrad ES120-7C
General Purpose Transceiver (GPT)
transducer plug assembly
Upper plug case
Plug
fastening ring
Contact body
Retaining ring
Outer screen and inner screen braid wire
untaped and spread out under washer
Outer screen together with inner screen.
Drain wire, fold back over jacket
and temporary fastened with tape.
Heat-shrinkable tubing
Lower plug case
Washers
Bottom cap
and cable clamp
Rubber sleeve
Rubber sleeve
Note:
All measurements are in mm.
The drawing is not in scale.
38
CD010219A Page 1 of 1
824-201575 Rev .C
330254/A
Drawing file
Outline dimensions and installation drawings
Note
Observe the 32 Nm torque when the transducer is mounted using
the mounting and clamping rings.
Observe the 17 Nm maximum torque when the transducer is
mounted using the threaded inserts on the transducer body .
In addition to the drawings available in this chapter, an additional
drawing is provided on the web site. This is drawing 599–203664
describing an optional steel tank for the transducer.
Topics
330254/A
•
Outline dimensions [204579] on page 40
•
Recommended arrangement [204678] on page 41
•
Mounting ring [204675] on page 43
•
Clamping ring [204677] on page 45
39
Simrad ES120-7C
Outline dimensions [204579]
40
330254/A
Drawing file
Recommended arrangement [204678]
330254/A
41
Simrad ES120-7C
42
330254/A
Drawing file
Mounting ring [204675]
330254/A
43
Simrad ES120-7C
44
330254/A
Drawing file
Clamping ring [204677]
330254/A
45
Simrad ES120-7C
46
330254/A
Index
Index
A
About, 5
information in this
manual, 5
Acoustic window
example, 21
installation, 20
Additional information, 5
Air outlet
example, 13, 15
Anti-fouling
paint, 31
Approval
maritime authorities, 5
Arrangement
drawing, 41
B
Blister
Common guidelines, 16
installation, 12
physical location, 17
toe-in, 16
Boundary water layer, 8
Bow thrusters
noise, 9
Box keel
example, 18
installation, 17
C
Cable
transducer, splicing, 29
Cable gland
about, 25
GRP hull, 27
small hull, 28
steel hull, 26
wooden hull, 27
Clamping ring
blister, 12
drawing, 45
example, 13
Clamping rings, 12, 17,
19–20, 22
Common guidelines
blister, 16
Conduit
steel, 30
D
Diameter
steel conduit, 30
330254/A
Dimensions
drawing, 40
Drawing
arrangement, 41
Clamping ring, 45
GPT Transducer plug, 38
mounting arrangement, 41
Mounting ring, 43
outline dimensions, 40
Drawing file, 36
Drop keel
installation, 23
E
EMC interference, 30
Emuge, 32
Example
Acoustic window, 21
Air outlet, 13, 15
box keel, 18
Clamping ring, 13
flush mounting, 20
Inside the hull, 22
Mounting ring, 13, 15
Streamlined blister, 13, 15
F
Flush mounting
example, 20
steel tanl, 19
G
GPT Transducer plug
drawing, 38
GRP hull
cable gland, 27
H
Handling, 31
Handling rules, 31
Heat, excessive
do NOT expose, 31
Hull unit
installation, 24
I
Inclination
angle, 9
Inside the hull
example, 22
installation, 21
Installation
drawings, 6, 36
hardware, 6
responsibility, 6
Installation method
Acoustic window, 20
Blister, 12
Box keel, 17
Drop keel, 23
Flush mounting, 19
Hull unit, 24
Inside the hull, 21
Retractable, 24
Steel tank, 19
Introduction, 6
L
Lifting, 31
Location
recommendation, 10
M
Maintenance, 31
Maritime authorities
approval, 5
Mounting arrangement
drawing, 41
Mounting ring
blister, 12
drawing, 43
example, 13, 15
Mounting rings, 12, 17,
19–20, 22
N
Noise
boundary water layers, 8
bow thrusters, 9
propeller, 9
protruding objects, 7
O
Order number
transducer, 6
Outline dimensions
drawing, 40
P
Paint
anti-fouling, 31
Physical dimensions
47
Simrad ES120-7C
drawing, 40
Physical location
blister, 17
Propeller
noise, 9
Protruding objects, 7
Purpose
this manual, 5
R
Retractable
installation, 24
S
Self-locking taps, 32
Shielding
steel conduit, 30
Simrad website, 5
Smooth surface, 12, 18–20, 22
Splicing
transducer cable, 29
Steel conduit
diameter, 30
qualities, 30
shielding, 30
why, 30
Steel hull
cable gland, 26
Steel tank
flush mounting, 19
Streamlined blister
example, 13, 15
Sunlight
do NOT expose, 31
Support bar, 12, 18–19
Surface
smooth, 12, 18–20, 22
T
Taps, self-locking, 32
Toe-in
blister, 16
Transducer
lifting, 31
order number, 6
recommended location, 10
Transducer cable
splicing, 29
Transducer plug
drawing, 38
W
Wooden hull
cable gland, 27
48
330254/A
Index
330254/A
49
ISBN-13: 978-82-8066-106-7
©2009
Kongsberg Maritime AS
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