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Sounder "NEL-3" # 004A typical installation diagram shows that the depth indicator and the amplifier are usually located in the navigator's cabin, and the pointer scales should be at eye level. The relay box and the transformer are located in any dry room, free from coal dust and sudden temperature changes (not allowed, for example, to be installed in the stoker), on the line between the pointer and the vibrator-radiator. In this case, the distance between the vibrator-emitter and the relay box should not exceed 8-10 m. Vibrators are installed in the underwater part of the vessel with a slotted bottom near the keel. The base between the vibrators is recommended 1 m. Vibrators can be installed along the sides or one side. The end plane of the vibrators should be horizontal. If the bottom of the vessel in the place of installation of the vibrators is tilted (not horizontally), it is necessary to install fairings on the outer side of the bottom. Ahead of the vibrators (along the vessel) there should not be any protruding suction or discharge devices capable of creating discontinuities or turbulence in the water flow under the vibrators. All instrument housings and cables must be reliably grounded. Proper installation of sonar devices (especially vibrators), careful shielding and grounding are of great importance for obtaining good sonar operation. Before starting the echo sounder, it is necessary to make sure that the ship's voltage is available using a voltmeter on the indicator. The voltmeter should indicate 110 volts or 220 volts or 24 volts respectively, with a tolerance of ± 10%. The echo sounder is turned off by turning the switch on the pointer. The range switch is set to the appropriate range. Then the gain control is rotated smoothly from the zero position clockwise until clear depth readings appear, i.e. clear flashes of the neon light bulb. You should not turn this knob too far away, as this may cause repeated (multiple) flashes of a neon light bulb. To stop the echo sounder, you need to put the switch in the "off" position. The gain control should be set to the extreme anti-clockwise position. Caring for an echo sounder is reduced to keeping the relay contacts clean, the parcel contacts in the index and the speed controller contacts, as well as the collectors and rings of the umformer and the motor. Periodically lubricate the felt in the parcel cams and lightly lubricate the cam itself. Periodically, at least after 50 working hours, a thorough inspection of all parts of the echo sounder should be carried out and, if necessary, lubricated and cleaned. Periodically check the stopwatch speed indicator disc. When working on the 100th scale, the test is made by flashes of white light on the depth indicator, for which the gain control should be set to the extreme position counterclockwise (the white light will come on). When operating on a scale of 500 m, revolutions are checked by flashes of a neon bulb. The number of flashes of a neon bulb on the 500th scale or flashes of white light on the 100th range should be 90 per minute. If at normal ship voltage there is a sharp deviation of the number of revolutions of the disk from the specified one, then the corresponding pair of contacts of the engine speed regulator should be adjusted. Adjustment of the echo sounder immediately after its installation on the vessel must be carried out by a specialist who carried out technical monitoring during the installation of the echo sounder. Do you want your website to load quickly? Use Gitadvice.com hosting for your projects. We switched to this hosting and are very happy.
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