SeaKing Sidescan Operators Manual
Contents
1. Issue 3 TIL Eng Spec 041 SeaKing Sidescan OM 10 10 10 Page 4 of 16 Tritech International Ltd SeaKing Sidescan OM Warranty Statement Tritech International Limited herein after referred to as TIL TIL warrants that at the time of shipment all products shall be free from defects in material and workmanship and suitable for the purpose specified in the product literature The unit system warranty commences immediately from the date of customer acceptance and runs for a period of 365 days Customer acceptance will always be deemed to have occurred within 72 hours of delivery Note Any customer acceptance testing if applicable must be performed at either TIL premises or at one of their approved distributors unless mutually agreed in writing prior to despatch Conditions These include but are not limited to the following 1 The warranty is only deemed to be valid if the equipment was sold through TIL or one of its approved distributors 2 The equipment must have been installed and commissioned in strict accordance with approved technical standards and specifications and for the purpose that the system was designed 3 The warranty is not transferable except or as applies to Purchaser first then to client 4 TIL must be notified immediately in writing of any suspected defect and if advised by TIL the equipment subject to the defect shall be returned by the customer to TIL via a suitable mode of transporta2. Housing Dimensions Issue 3 TIL Eng Spec 041 SeaKing Sidescan OM Specifications Length Diameter Tow Point Tow Bracket Length Mass Weight in Water Depth Rating Standard Depth Rating Optional Operating Tow Speed max Operating Tow Speed norm Transit Tow Speed SeaKing 675kHz Frequency of Operation Bandwidth Beam Width Standard Beam Height Beam Centre Line SeaKing 325kHz Frequency of Operation Bandwidth Beam Width Standard Beam Height Beam Centre Line Transmitter Source Level Transmitter Pulse Length Receiver Sensitivity Gain Control Range Display Dynamic Range Data Sampling Rates Data Resolution Power Requirements Power Range Comm s protocols Data rates Cable Connector Towfish cable type 947 mm 63 mm 300 mm from front 300 mm 7 0 kg 4 1 kg 200 m 3000 m 5 knots 2 knots 0 25 knots 675 kHz 30 kHz 0 45 50 25 below horizontal 325 kHz 15 kHz 0 65 50 25 below horizontal 208cB re 1pPascal m 50 200 us 2mV R M S 80 dB 40 dB 5 200 us 4 8 bits 30VDC 5 Watts 12 VDC to 36 VDC ARCNET multidrop 156 25 kBaud Tritech 6pin Kevlar Re enforced Page 16 of 16
3. right to change specifications at any time without notice and without any obligation to incorporate new features in instruments previously sold Note If the instrument is not covered by warranty or if it is determined that the fault is caused by misuse repair will be billed to the customer and an estimate submitted for customer approval before the commencement of repairs F167 1 Issue 3 TIL Eng Spec 041 Page 5 of 16 Tritech International Ltd SeaKing Sidescan OM Safety Statements Throughout the manual certain safety or operational related comments and requirements will be highlighted to the operator by indications identified by the ion Caution adjacent symbol and text Technical Support Contact your local agent or Tritech International Ltd Tritech International Ltd Peregrine Road Westhill Business Park Westhill Aberdeen AB32 6JL UK Telephone 44 0 1224 744111 Fax 44 0 1224 741771 Email support tritech co uk Web www tritech co uk An out of hours emergency number is available by calling the above telephone number If you have cause to use our Technical Support service please ensure that you have the following details at hand prior to calling e System Serial Number if applicable e Fault Description e Any remedial action implemented Due to the expansion of equipment capabilities and the fact that new sub modules are continually being intr
4. targets appear weak in comparison with close targets the High setting should be selected Conversely if far targets are strong in comparison to near targets then the Low setting should be used Issue 3 TIL Eng Spec 041 Page 14 of 16 Tritech International Ltd SeaKing Sidescan OM MAINTENANCE OF THE SEAKING SUBSEA UNITS There are no user serviceable parts in the transducers and electronics pod and no components requiring routine maintenance It is recommended that the units be rinsed down with fresh water after each dive and especially if the unit is not going to be used for extended periods Although the anodised aluminium components are very resistant to corrosion using fresh water is a simple way of minimising the chance of corrosion Wherever possible avoid any prolonged exposure to extreme climatic and weathering conditions to reduce any ageing effects on the protective boot and connectors TROUBLE SHOOTING Symptoms 1 Continuous Status No Comms message This indicates that there is no communication with the device flagged Check the power and communications links to the sonar head for continuity and for correct polarity voltage and ensure that the power supply can provide sufficient current to power all devices If necessary refer to the service section to check that the head internal fuses have not blown If a cable flood is suspected then the conductors will need to be insulation tested the subse
5. R On completion of installation of the sonar on a vehicle it can be tested in air by powering up the system and observing that there are no communication errors on the SCU display As with any acoustic sonar the ST sidescan only show echoes of objects that reflect sound back to the sonar transducer such that hard shiny surfaces are sometimes only seen when they are at right angles to the sonar head and rough seabed textures can blot out smaller targets completely The plan view also does not show how high an object is unless a shadow is cast in which case the length of the shadow is related to the height of the object its range and the height of the sonar head The SEAKING Sidescan Sonar is normally supplied with one of two operating frequencies typically 325 kHz and 675 kHz The lower 325 kHz frequency is capable of detecting large targets at ranges in excess of 200 metres The higher 675 kHz frequency has a narrow beam and shorter 100m range for more detailed images of closer targets Interpretation of sonar data develops with experience Sonar reflections of isolated small objects give no indication of shape or attitude Man made structures such as platforms or rock walls tend to have regular patterns that are easier to identify Using a sonar is rather like looking at a world made of shiny black plastic in the dark with only a narrow torch beam for illumination Remember that when close to large objects or in a depression in the sea
6. RECEIVE SIGNAL DYNAMIC EANSE SOREEN COLOUR SCALE The sonar receiver will accept a return signal in the region of 0 80dB The dynamic range controls are used to adjust the position of a sampling window within the 0 80dB dynamic range band of the receive signal By switching the Sensitivity control between Low Med and High the position of the receiver s sampling window is adjusted within this 0 80dB window Setting the Sensitivity control to Low will move the sampling window to the lower end of the 0 80dB scale This will produce a more saturated display with greater weak return content Med is the default setting for this control and will produce the best all round display Set the Sensitivity control to High to omit background noise and low level returns seen at the receiver The Contrast control is used to adjust between three preset widths of sampling window Set the Contrast control to High to decrease the size of the sampling window and accordingly increase the sonar display contrast Med is the default setting for this control and will give the best results under most conditions Set the control to Low to reduce the contrast of the sonar display SONAR SLOPE CONTROL This sets the slope of the time varying gain which applies more receive gain for distant targets to compensate for through water losses on the acoustic signal The normal settings is medium Med but if far
7. Tritech gt International Limited SeaKing Sidescan Operators Manual The electronic version of this document is the controlled copy Therefore all printed versions of this document are uncontrolled Supplied by Issue 3 TIL Eng Spec 041 SeaKing Sidescan OM COPYRIGHT Tritech International Ltd The copyright in this document is the property of Tritech International Limited The document is supplied by Tritech International Limited on the understanding that it may not be copied used or disclosed to others except as authorised in writing by Tritech International Limited Tritech International Limited reserved the right to change modify and update designs and specifications as part of their ongoing product development programme F063 1 Tritech International Ltd TABLE OF CONTENTS Warranty Statement Safety Statements Technical Support SEAKING SIDESCAN SONARS INTRODUCTION Subsea sensor Electrical Installation ST Head Subsea Interconnect Cabling SEAKING Communication Configuration Ground Fault Monitoring Equipment Mechanical Installation USING THE ST SONAR SEAKING sidescan Sonar Operating Notes SCREEN DISPLAY Main Sidescan Sonar Controls ccccccccccccecceeeeeeeeeeeeeeeeeesssseseees Setting Up the Sonar Configuration cc cccceeeeseeeeeteeeeeeeeeees Dynamic Range Sonar Slope Control MAINTENANCE OF THE SEAKING SUBSEA UNITS TROUBLE SHOOTING SPECIFICATION
8. a electronics and SEAKING SCU must be disconnected This is especially critical If a cable insulation tester is used to check resistance between conductors as serious damage to the units will occur if the correct procedure is not followed Caution 2 No seabed sonar targets observed SEAKING Sidescan sonars generally have a vertical beam width of 50 degrees about a centre line i e plus and minus 25 degrees They should therefore be set with the centre line angled downwards at 25 degrees to the horizontal The following guide indicates the approximate first seabed return for a given height of the transducer off the seabed Height First return 1 metre 1 2 metres 2 metres 1 5 3 metres 4 metres 3 6 metres SEAKING SCU Head Status Codes Code Possible Reason or Fault giving Error Code No reply Subsea units not powered up or comms fault Busy Subsea unit has failed to initialise properly Ground Fault Monitoring Equipment The power supply within SEAKING subsea electronics includes an electrically isolated DC DC converter front end There is a small capacitive connection to the sonar chassis which should not noticeably affect any impressed current ground fault indicator GFI equipment Issue 3 TIL Eng Spec 041 Page 15 of 16 Tritech International Ltd SPECIFICATION NY ae 2m e SeaKing Towfish Sidescan Dimensions e SeaKing ROV Mounted Sidescan Electronics
9. are shown in italics Issue 3 TIL Eng Spec 041 Page 8 of 16 Tritech International Ltd SeaKing Sidescan OM Refer to the document SeaKing Serial Communication Manual for more information on RS232 configuration and baud setup The towfish has a different cable with Kevlar re enforcement as shown below Comms Yellow Comms Green Ov DC Blue N C Screen Connector Face View Alternative Underwater Connector Wiring Configuration for the old type towfish cable NOT Part number S1437 Note the colour changes for certain wires Towfish cable Part number S1437 has the same colour designation as fig 1 0 however the green wire is not present Caution If in doubt buzz it out AIFV3B J2 1 DIi5M Connector ow UAV Connector Pin3 Aed 24y Pind Black WDG Pint Yellow Pin 2 Blue Fitted in euppliod connector Fitted in Junction Box or suitable location IMPORTANT NOTE 1 Termination resistors Surface and Subsea fitted to twisted pair to enable good communications Install 270R Surface and 39R Subsea Refer to SYSTEM section of manual for more details SeaKing Sonar ARCNET communications typical connections Fig 1 1 SeaKing Communication Wiring Diagram Issue 3 TIL Eng Spec 041 Page 9 of 16 Tritech International Ltd SeaKing Sidescan OM SEAKING COMMUNICATION CONFIGURATION All SEAKING systems communicate using ARCNET mult
10. bed that the viewing range may be severely limited Very strong reflectors may give multiple echoes along a bearing line and are identified by being equispaced in range If they persist reduce the Gain When searching for objects keep the vehicle heading as steady as possible to stop the image blurring Experience with the sonar will enable the operator to be able to quickly and effectively set the Gain Contrast and Sensitivity controls to give as even a background as possible without swamping the display and maximise the performance capabilities of the head Separate controls are available for each transducer Although normally the settings would be the same under some conditions e g sloping seabeds different settings may be needed from port to starboard The Time Variable Gain TVG Slope may be adjusted to improve sonar return balance on longer ranges Issue 3 TIL Eng Spec 041 Page 11 of 16 Tritech International Ltd SeaKing Sidescan OM SEAKING SIDESCAN SONAR OPERATING NOTES The main controls are as described in the SEAKING System manual Some screen controls are not active for the sidescan application and are designed for use with other SeaKing devices The Main Areas of the Sidescan Display are identified below SCREEN DISPLAY 5 Tritech SeaKing Sidescan Sonar EYE zoom KHa REY EBR Log Replay 06 Apr 1998 13 50 09 Log Percent Main Sidescan Sonar Controls Controls spec
11. d they should be handled with care particularly the connector and transducer heads It is strongly Caution recommended that they be positioned where they will receive adequate protection from impact damage A SEAKING sidescan electronics pod should be secured by clamping on the cylindrical body section Any metallic clamps should be electrically insulated from the sonar body by means of rubber or plastic strips or mount brackets of at least 3 mm thickness and extending at least 3 mm beyond the clamp boundary to reduce any galvanic corrosion effect Non metallic clamps are preferable if metallic clamps are used especially if they are other than aluminium they should be painted or lacquered with at least two or three coatings Brass or bronze materials should be avoided unless they have aluminium content as their copper content cause s serious corrosion problems when in proximity to aluminium components Care should be taken to mount transducers such that the longitudinal axis is as close to the true vertical as possible in relation to the trim position of the vehicle The transducers should be mounted angled down to the sides at according to the beam centre line given in the specification 25 to the horizontal for standard units This is important since errors in the head alignment can give rise to unreliable results Issue 3 TIL Eng Spec 041 Page 10 of 16 Tritech International Ltd SeaKing Sidescan OM USING THE ST SONA
12. er capacitor of not less than 470uF for each head being powered If an unregulated PSU is used then make sure that the voltage value measured at the head is in the range 18 36v DC in power on off and running conditions If powering the head s down a long lead or umbilical the maximum recommended loop resistance of the power line must not exceed 10 for one head 5Q for two heads and 32 for three heads If the supplied voltage is less than 18v dc the head will not operate correctly Never try to make SeaKing system heads work down a long cable by increasing the PSU output voltage above 36v DC A 48VDC PSU Option is available that will allow operation up to 70VDC for long line applications Caution Generally the Towfish will require a launch voltage of at least 30VDC at the surface to guarantee operation beyond 30 metres range ST HEAD SUBSEA INTERCONNECT CABLING The Underwater Connector supplied is 6 way the wiring code for the ROV version is shown below The numbers shown relate to all schematic diagrams not a DIN style format Ignore any moulded numbers by the pins in the sonar profiler head Caution ARCNET A RS 232 Tx ARCNET B RS 232 Rx ellow Blue Red Black reen Screen 24vDC 24v DC Ov DC Ov DC RS 232 Gnd HEAD CHASSIS Connector Face View Fig 1 0 Tritech 6 Way Underwater Connector Wiring Configuration Pin outs for optional single node RS 232 communications
13. idrop networked communications on the twisted cable pair It is possible to interface the ARCNET to wide band multiplexor systems contact Tritech for details IMPORTANT NOTE The ARCNET does require termination resistors to be fitted at each end of the umbilical Normally this is supplied fitted within the D connector at the surface and is left for the user to fit at the subsea end in a convenient J box This is the easiest system to adopt when using multiple sensors on the network However if just one device is in use it may be more convenient to fit the resistor inside the subsea unit Devices fitted with a termination resistor should be appropriately labelled but the user can check by measuring the resistance between pins 1 and 2 on the water block connector The SEAKING SCU and SEAKING heads cannot be used with RS 232 RS 485 AIF Cards as used in earlier WINSON based SCU 3 systems and must be used with AIF SEAKING ARCNET AIFV3 Cards RS 232 RS 485 Series 2 Sonar Profiler and other heads cannot be directly used with SEAKING systems Contact Tritech or local agent for details GROUND FAULT MONITORING EQUIPMENT The power supply within SEAKING subsea devices includes an electrically isolated DC DC converter front end There is a small capacitive connection to the sonar chassis which should not noticeably affect any impressed current ground fault indicator GFI equipment MECHANICAL INSTALLATION Although the units are rugge
14. ific to the sidescan are as follows These control the port 1 and starboard 2 channel gains TVG slopes the range and the contrast settings The Gain Slope and Range controls correspond to and are operated from the RAT controls OR L amp R trackball select buttons C1 Gain1 C2 Slope1 C3 Range C4 Gain2 amp C5 Slope2 The Contrast control is L amp R trackball button operated only Gain sets the starting gain for close targets and should be set to obtain good definition of the seabed close to the transducers Slope is adjusted to give good definition of targets at longer ranges Issue 3 TIL Eng Spec 041 Page 12 of 16 Tritech International Ltd SeaKing Sidescan OM Range sets the maximum distance and is common to both port and starboard transducers Contrast sets the size of the receiver s sampling window A lower contrast setting narrower sample window will remove a lot of clutter and noise that may be picked up in a larger window A combination of Contrast and Sensitivity can be used effectively to select the desired dynamic sampling range See Dynamic Range Screen Display Toggle buttons Display Port Transducer Only Setting Up the Sonar Configuration Display Starboard Transducer Only Display both Port and Starboard Transducers The Sidescan Sonar set up controls are accessed by clicking the trackball on the Spanner Icon on the Menu Bar These Set up controls are automatical
15. ly remembered if the Sonar System is shut down using the Exit commands prior to powering off Reset Controls inverted Head eo eRe EL Compass Stab Flip Display Time Marks ES Issue 3 TIL Eng Reset Controls resets back to default settings Units select units for range scale metres feet fathoms and yards More Options Enables the less frequently used controls and check boxes F Reset reset back to default tuned operating frequency Slider bar adjusts frequency by 20kHz Flip Display swaps port and starboard transducers with respect to display Time Marks Plots a line marker on the time axis at 1 minute intervals Cycle Direction Plot Normal setting shown Cycles display direction top to bottom left to right bottom to top right to left Sensitivity Slope See Dynamic Range and Sonar Slope Control sections of manual Compass Stab Inverted Head controls not used with standard sidescan configuration Spec 041 Page 13 of 16 Tritech International Ltd SeaKing Sidescan OM DYNAMIC RANGE The dynamic range controls should be used with care If used properly however they can become very useful tools The Dynamic Range controls Sensitivity and Contrast can be adjusted to set the sampling range of the Sonar Receive Signal which extends from OdB to 80dB The following diagram describes operation
16. oduced this manual cannot detail every aspect of the operation Issue 3 TIL Eng Spec 041 Page 6 of 16 Tritech International Ltd SeaKing Sidescan OM SEAKING SIDESCAN SONARS INTRODUCTION The ST SEAKING range of sidescan sonars includes both towfish and ROV versions and are available with two standard frequencies 325 and 675kHz Other frequency options are available and Tritech should be contacted for more details of these The transducer arrays are available in different configurations for various beam shapes The electronics for the towfish system are contained within the fish while the ROV systems has two separate transducers which are connected with interconnect leads to a dual channel electronics pod A waterblock connector is fastened to the fish or electronics pod and provides a 4000metre rated pressure bulkhead The 6 way underwater connector is secured to the waterblock fitted to the body tube using four cap screws this connects to the pins on the PSU COMMS PCB An O ring seals the connector to the waterblock The SEAKING sidescan systems have the facility for the Gain and Time Variable Gain TVG slope to be set up from the SEAKING Surface Control Unit to specific user requirements ROV Sidescan Installation Side view of vehicle Front view of vehicle Notes 1 Electronics pod can be mounted anwhere 2 Transducers can be connector forward or connector aft 3 Transducers should be close to pitch cent
17. re of vehicle The SEAKING sidescan transducers are each supplied with their own colour coded waterblock connector and interconnect cable to the electronics pod The electronics pod has its own water block connector and is supplied with a cable tail to connect to the customers system Depending on the specification of the system this cable will either need to be terminated to a suitable connector appropriate to the operators equipment or may be supplied with a cable assembly to one or more additional connectors The waterblock is fastened to the electronics pod and provides a 4000metre rated pressure bulkhead This will protect the electronics from water ingress in case the connector is damaged or not fitted correctly The connector may be disconnected from the heads by unscrewing the four securing screws and removing the connector from the waterblock Issue 3 TIL Eng Spec 041 Page 7 of 16 Tritech International Ltd SeaKing Sidescan OM It is not necessary to remove the water block when removing the connector or taking the pod apart When the connector is removed from the head the blanking plugs supplied should be fitted to prevent the ingress of dirt or moisture Caution SUBSEA SENSOR ELECTRICAL INSTALLATION The SeaKing range of Subsea Sensors are designed to work from a smoothed DC power supply of 18v 36v DC Absolute Maximum 36v DC If using a rectified transformer PSU the output of the PSU must have a filt
18. tion and shall be freight paid 5 The warranty does not apply to defects that have been caused by failure to follow the recommended installation or maintenance procedures Or defects resulting from normal wear amp tear incorrect operation fire water ingress lightning damage or fluctuations in vehicles supply voltages or from any other circumstances that may arise after delivery that is outwith the control of TIL Note The warranty does not apply in the event where a defect has been caused by isolation incompatibilities 6 The warranty does not cover the transportation of personnel and per diem allowances relating to any repair or replacement 7 The warranty does not cover any direct indirect punitive special consequential damages or any damages whatsoever arising out of or connected with misuse of this product 8 Any equipment or parts returned under warranty provisions will be returned to the customer freight prepaid by TIL 9 The warranty shall become invalid if the customer attempts to repair or modify the equipment without appropriate written authority being first received from TIL 10 TIL retains the sole right to accept or reject any warranty claim 11 Each product is carefully examined and checked before it is shipped It should therefore be visually and operationally checked as soon as it is received If it is damaged in anyway a claim should be filed with the courier and TIL notified of the damage Note TIL reserve the
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