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

• IMO Wheelmarked with MED-B
• Navigation Echo Sounder
• Single frequency – 50 or 200 kHz
• Colour 9″ touch screen
• Auto Gain
• Auto TVG
• Auto Range
• Auto Power

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

1. 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.
2. 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.
3. 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.
4. Pythagoras error: This error is found when two transducers are used one for transmission and the other for reception.
5. 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.
6. 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