SKIPPER ESN100 IMO Wheelmarked Echo Sounder
The SKIPPER ESN100 IMO Wheelmarked Echo Sounder is a navigation Echo Sounder with a black box and a 9″ touch display. The Echo Sounder graphics are continuously shown on the screen along with complete navigational details. Most of the functions are automatic.
SKIPPER ESN100 Display
Specifications :
| Echo Sounder : | ESN100 |
| Functions : | Auto/Manual TVG |
| Auto/Manual Gain | |
| Auto/Manual Power | |
| Auto/Manual Range | |
| Transducer positioning | |
| Internal sounder for alarm/button press | |
| Power Supply : | DC: 10-32 V |
| AC: 21-36 V (Transceiver unit) | |
| Display : | 9″ Touch Display |
| Mounting Dimensions : | 224.5 mm wide x 140 mm high (Cut-out) |
| 242 mm wide x 158 mm high (Outside dimensions) | |
| Memory : | 24 hours history, external logging feature over network |
| Ranges : | Selectable from 0-1000 m |
| Selectable from 0-5000 m | |
| Measuring accuracy: | Error less than 1 % |
| Frequencies : | Approved frequencies: 50/200 kHz, 200 kHz 50 kHz and 38 kHz |
| Other frequencies covered: 24, 30, 33, 100 and 210 kHz | |
| Output power : | Nominal 700 W |
| Max> 1000 W | |
| Alarms : | BAM compatible (IEC62923) (ALF and ALR) |
| Interlan sounder | |
| Relay output and AUX in/out | |
| Calendar/clock : | From GPS input |
| Data output : | 2xLAN (IEC61192-1) Control unit |
| 5xNMEA0183 (IEC61162-1) Control unit | |
| 2xAUX Control unit | |
| 1xRelay Control unit | |
| 3xNMEA0183 Display unit | |
| 1xLAN Display unit | |
| DPT, PSKDPT, DBS, DBK, ALR and ALF | |
| Inputs : | 3xNMEA0183(IEC61162-1) Control unit |
| 1xAUX Control unit | |
| 2xNMEA0183 Inputs (IEC61192-1) Display | |
| 1xLAN Display | |
| Accepting signals from GPS, Gyro, Alarm and Draft sensor | |
| Language : | English |
| Option : | Remote depth indicators |
| 24 kHz transducer | |
| 38 kHz transducer | |
| 50 kHz transducer | |
| 200 kHz transducer | |
| Dual 50/200 kHz transducer | |
| Retrofit plate for GDS101/GDS102 | |
| Remote dimmer | |
| Classification : | IMO Wheelmarked |
| MED-B | |
| CCS | |
| RMRS | |
| Service : | Available in most major harbours, world-wide through extensive dealer network |
Working
The acoustic pulses of very short duration are transmitted vertically at the rate of 5 to 600 pulses per minute having a beam width of 12 to 25°. These pulses strike the seabed and get reflected back toward the receiving transducer as echoes. These received echoes are converted into electrical signals by the receiving transducer and after passing through the different stages of the receiver, the current is supplied to the stylus which bums out the coating of the thin layer of aluminum powder and produces a black mark on the paper indicating the depth of the seabed.
Errors of the Echo Sounder
- The velocity of propagation in water The velocity of acoustic wave changes if temperature, salinity or pressure changes, and since velocity is not correct, the depth recorded will be inaccurate.
- Stylus speed error: The stylus is rotating with a certain constant speed and the speed of the stylus that the time is taken for the stylus to travel from top to bottom is exactly equal to that for an acoustic pulse to travel twice the distance of the range selected. Due to the fluctuation in the voltage, the speed of the stylus motor changes hence the depth recorded Will be inaccurate. It should be checked periodically and adjusted as per the instruction is given in the manual.
- Multipath Echoes: The echo may be reflected a number of times between the keel and the seabed, thereby giving multiple depth marks on the record, in such cases the first echo is the correct depth.
- Pythagoras error: This error is found when two transducers are used one for transmission and the other for reception.
- Thermal and Density layer. The density of the water varies with temperature and salinity, which will tend to form different layers. It is possible for echoes to return from the surface of these layers and a faint line appears between zero and actual depth.
- Zero line adjustment error If the zero adjustments is not correct, the depth recorded will not be correct.
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Source: cultofsea.com
