Installation Principles
Door sensors need to be installed in pockets welded on trawl doors. Carefully read these installation principles before installing sensor pockets.
Angle of Attack
The angle of attack is the angle of the door in relation to the towing direction. This angle is important for the efficiency of the doors. It varies between trawl door models, so refer to manufacturer to know the exact angle. The angle is usually from 25° to 40°.
|
1. Angle of attack: 25-40° 2. Opening angle: 25-40° |
Opening and Elevation Angles
The opening and elevation angles depend on the pocket installation on the door.
The opening angle is the horizontal angle of the pocket in relation to the door. It should be between 25° and 40°. Opening angles should be in line with the angle of attack. You need to indicate the opening angle on Mosa2.
The elevation angle, or tilt angle, is the vertical angle of the pocket in relation to the door. It should be between 15° and 20°. The sensor must point toward the vessel: adjust the elevation angle based on the operational depth of the door during fishing operations.
|
1. Elevation angle: 15-20° 2. Opening angle: 25-40° |
|
1. Elevation angle: 15-20° |
Roll Angles
Installing a Door Explorer on a Clump
The sensor must be installed on the port side of the clump so that the clump does not block the down sounding.
|
The roll of the sensor must be 0°, so that the down sounding has an angle of 25° toward the port side. This way, the down sounding will not be blocked by the clump.Make sure the soundings toward port and starboard doors are not disturbed either. |
|
The sensor must have an elevation angle
between 15° and 20° in order to communicate with the
vessel. In the same way as for the doors, adjust the angle according to the depth of the clump during fishing operations. |