Furuno FE-700 - Manual (Page 7)

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SYSTEM CONFIGURATION
TRANSDUCER
DISTRIBUTION
BOX
FE-702
DISPLAY UNIT
FE-701
JUNCTION BOX
JIS F8821-1
MATCHING BOX MB-502 (for 50B-6B)
MB-504 (for 200B-8B)
JB JB
IEC 61162-1
EIA-232C
IEC 61162-1
Navigation Device
Navigation Device
Personal Computer
IEC 61162-1
JB
TRANSDUCER SWITCH BOX
EX-8
DIGITAL DEPTH INDICATOR
FE-720
CONTACT CLOSURE
Alarm Unit
: Standard Supply
Ship’s mains
100-115 VAC/200-230 VAC
or
24 VDC
: Optional Supply
TERMINAL BOX
DS-802
: Local Supply
FE-700 system configuration
PRINCIPLE OF OPERATION
The FE-700 uses ultrasonic pulses to detect the seabed and other underwater objects. The display unit
contains all basic electric circuits and logic processor. Electrical pulses are converted into acoustical
energy in the transducer fitted on the ship’s hull. The processor measures the time of pulses travelling
between the seabed and transducer and displays the water depths in the graphical form or other forms.
The transducers have a specific beam width with respect to their working frequency, 50 kHz or 200 kHz.
The high frequency has a narrow beamwidth and is immune to aeration when the ship is going astern or in
rough weather. The low frequency has a wide beamwidth and more powerful sounding capability.