Furuno SEARCHLIGHT CH-250 - Manual (Page 17)

7
Wealding bead
Wealding bead
1/2 1/3
Within 1 meter
Installation location for hull unit
•
Select a place where interference from the transducers of other sounding equipment is
minimal. The hull unit should be at least 2.5 meters away from the transducers of other
sounding equipment.
•
An obstacle in the fore direction not only causes a shadow zone but also aerated water,
resulting in poor sonar performance. Be sure to locate the transducer well away from any
obstacle in the fore direction.
Mounting method
A typical mounting method is shown in the outline drawing at the back of this manual. Consult
ship’s owner, dockyard and user to determine appropriate mounting method. Pay attention to
safety (strength, watertightness) first, followed by ease of maintenance and inspection.
1.3.3 Transducer tank
Tank length
Shorten the transducer tank so the transducer is
lowered into water as deep as possible. Pay particular
attention to the tank length Lt. Determine the length of
the main shaft.
•
Length of main shaft = Lt + 200 mm (for 400 stroke)
•
Length of main shaft = Lt + 50 mm (for 250 stroke)
Note :
When the retraction tank is constructed locally,
finish it so that welding beads do not protrude on
the inner surface of the tank. The tank guide will hit
the bead, burning out the raise/lower motor. Also,
do not position the welding bead in the ship’s
fore-aft line.