User manual SIMRAD TRANSDUCER INSTALLATION GENERIC REV H

[. . . ] Installation manual Simrad transducers Installation principles and guidelines www. SIMRAD. com MAXIMIZING YOUR PERFORMANCE AT SEA Echo sounder transducers Installation manual This document provides a generic description of echo sounder transducer installation. The information 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. 851-160164/H September 2006 Document history Document number: 851-160164 / ISBN-10: 82-8066-036-4 / ISBN-13: 978-82-8066-036-7 Converted to XML format. Chapters listing all Simrad transducers and their termination to the General Purpose Transceiver (GPT) are added. [. . . ] 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. 24 851-160164/H Ways of mounting the transducer Example Transducer mounting in a steel tank is shown in the figure below. G F A B D E (CD17012A) C (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 851-160164/H 25 Simrad Echo sounder transducers 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. Mounting and clamping rings 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 inside the steel tank, while the clamping ring fits around the edge of the transducer body. Bolts through the clamping ring into the mounting ring will then secure the transducer between them. Note that several transducers use direction guides to allow correct mounting. Smooth surface Mounting screws or bolts must not be extruding from the acoustic window. Ensure that the surface of the window, the hull plating and putty around the transducer is as even and smooth as possible. Obstructions on these surfaces will create problems with turbulant flow. Horizontal support bar Large diameter transducers must be fitted with a horizontal support bar. This bar can be secured to the mounting ring using threaded rods. 26 851-160164/H Ways of mounting the transducer Example 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. F E A B G D (CD017012B) C (A) = Steel tank (B) = Oil (C) = Acoustic window (D) = Cable service loop (E) = Stuffing tube (F) = Cable in steel conduit (G) = Oil inlet 851-160164/H 27 Simrad Echo sounder transducers 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. In addition to the loss, the beam pattern is degraded, because a larger area of the hull is set into vibrations. Mounting and clamping rings 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 inside the steel tank, while the clamping ring fits around the edge of the transducer body. Bolts through the clamping ring into the mounting ring will then secure the transducer between them. [. . . ] We also recommend that you install the transducer cable in a steel conduit. Related topics Cable splicing on page 36 Steel conduit on page 37 851-160164/H 59 Simrad Echo sounder transducers Deep water, split beam transducer This is the termination of the transducer cable from a deep water transducer. This transducer is designed to be used on submergibles, for example towed arrays. The cable is equipped with a watertight connector. The other end of the cable is permanently fixed to the transducer. 3 6 8 2 5 7 1 4 GPT Transducer socket B C A N M L K Pin 1 Pin 4 Pin 2 Pin 5 Pin 3 Pin 6 Pin 7 Pin 8 + + + + - Q1 Q2 Q3 Q4 Aft starboard Aft port Port Forward D E F H J 3 2 4 1 Starboard Fore port Fore starboard Quadrants seen from top of the transducer Burton connector Connection box with Burton socket 1 4 2 5 1 4 2 5 Quadrant 1 H J E F Quadrant 2 3 6 7 8 3 6 7 8 Quadrant 3 C D A B Quadrant 4 Screen to plug housing W802-11 Rev. A Deep water transducer, termination If you need to splice the transducer cable, it is very important to use the correct cable, and to avoid ground loops. [. . . ]