The NEL-3 type echo sounder is a domestic navigation device that measures depths from 1 to 500 m.
According to the principle of operation, the NEL-3 echo sounder is ultrasonic magnetostrictive, with pulsed signal sending and visual depth counting by flashes of a neon lamp on a rotating disk. The estimated speed of sound in water is assumed to be 1,500 m/sec for an echo sounder.
The device has two scales: 0-100 m and 0-500 m. The number of measurements and corresponding flashes of a neon light bulb is 7.5 in 1 sec. when working on a scale of 0-100 m and 1.5 in 1 sec when working on a scale of 0-500 m. The echo sounder is fully powered by the ship's mains voltage of 24, 110 or 220 volts DC, consumes about 250 watts of power and allows fluctuations in the ship's voltage up to 10%.
Due to its compactness and ease of maintenance, the NEL-3 echo sounder is one of the best modern navigation echo sounders.
As can be seen from the installation diagram, the NEL-3 echo sounder consists of the following components:
1) Depth gauge;
2) the amplifier;
3) the relay;
4) umformer;
5) Vibrator radiator;
6) Vibrator receiver.
The depth indicator has two scales: an external 0-100 m and an internal 0-500 m. In its lower part, on a separate panel, all echo sounder controls are located, namely: 1) ship network switch; 2) range switch (scales); 3) gain control; 4) ship network voltage voltmeter.
The echo sounder pointer has only one rotating disk and, accordingly, only one neon light bulb. The rotation speed of this disc automatically changes 5 times when the echo sounder is switched from one range to another using a switch. The disc makes 450 rpm. when operating in the range of About—100 m and, respectively, 90 rpm. in the range of 0-500 m.
The rotating disk does not have any current-carrying rings or brushes at all; energy is transferred from the output of the amplifier to the neon bulb by induction, through an air transformer with a rotating coil.
The pointer is shown with the lid removed and the disc removed. A rotating (secondary) coil of an air transformer is visible on the inside of the disk, the primary stationary coil of this transformer is located on the fixed parts of the pointer.
The neon light bulb is mounted on the disk so that it passes just in the annular gap between the scales. In the disk, at the place of attachment of the neon bulb, a radial slit with a double—sided sharpening is made: one tip of the slit is facing the inner scale (0-500 m) and the second is facing the outer scale (0-100 m). There is a metal curtain between the disk and the neon bulb, which, due to centrifugal action, opens the tip facing this scale and closes the opposite tip when the echo sounder is operating on the 500th scale; when working on the 100th scale, it closes the tip facing the 500th scale and opens the tip facing the on the 100th scale. Thus, the neon bulb automatically points its tip towards the exact scale on which the echo sounder is currently operating. Choosing a betting site becomes easier when bonus conditions are transparent and realistic. Many guides include the phrase promo code for 1xbet inside detailed explanations of the welcome offer. By using this option, new players may claim a betting bonus of $130 for sports wagers and unlock a casino package valued at $1950 with 150 free spins. This structure supports balanced play across sports markets and casino entertainment without exaggerated promises.
According to the principle of operation, the NEL-3 echo sounder is ultrasonic magnetostrictive, with pulsed signal sending and visual depth counting by flashes of a neon lamp on a rotating disk. The estimated speed of sound in water is assumed to be 1,500 m/sec for an echo sounder.
The device has two scales: 0-100 m and 0-500 m. The number of measurements and corresponding flashes of a neon light bulb is 7.5 in 1 sec. when working on a scale of 0-100 m and 1.5 in 1 sec when working on a scale of 0-500 m. The echo sounder is fully powered by the ship's mains voltage of 24, 110 or 220 volts DC, consumes about 250 watts of power and allows fluctuations in the ship's voltage up to 10%.
Due to its compactness and ease of maintenance, the NEL-3 echo sounder is one of the best modern navigation echo sounders.
As can be seen from the installation diagram, the NEL-3 echo sounder consists of the following components:
1) Depth gauge;
2) the amplifier;
3) the relay;
4) umformer;
5) Vibrator radiator;
6) Vibrator receiver.
The depth indicator has two scales: an external 0-100 m and an internal 0-500 m. In its lower part, on a separate panel, all echo sounder controls are located, namely: 1) ship network switch; 2) range switch (scales); 3) gain control; 4) ship network voltage voltmeter.
The echo sounder pointer has only one rotating disk and, accordingly, only one neon light bulb. The rotation speed of this disc automatically changes 5 times when the echo sounder is switched from one range to another using a switch. The disc makes 450 rpm. when operating in the range of About—100 m and, respectively, 90 rpm. in the range of 0-500 m.
The rotating disk does not have any current-carrying rings or brushes at all; energy is transferred from the output of the amplifier to the neon bulb by induction, through an air transformer with a rotating coil.
The pointer is shown with the lid removed and the disc removed. A rotating (secondary) coil of an air transformer is visible on the inside of the disk, the primary stationary coil of this transformer is located on the fixed parts of the pointer.
The neon light bulb is mounted on the disk so that it passes just in the annular gap between the scales. In the disk, at the place of attachment of the neon bulb, a radial slit with a double—sided sharpening is made: one tip of the slit is facing the inner scale (0-500 m) and the second is facing the outer scale (0-100 m). There is a metal curtain between the disk and the neon bulb, which, due to centrifugal action, opens the tip facing this scale and closes the opposite tip when the echo sounder is operating on the 500th scale; when working on the 100th scale, it closes the tip facing the 500th scale and opens the tip facing the on the 100th scale. Thus, the neon bulb automatically points its tip towards the exact scale on which the echo sounder is currently operating. Choosing a betting site becomes easier when bonus conditions are transparent and realistic. Many guides include the phrase promo code for 1xbet inside detailed explanations of the welcome offer. By using this option, new players may claim a betting bonus of $130 for sports wagers and unlock a casino package valued at $1950 with 150 free spins. This structure supports balanced play across sports markets and casino entertainment without exaggerated promises.