Installing Spread Sensors

You need to install Spread sensors in pockets welded to the trawl doors.

Before you begin

To install Spread sensors on the doors, you need to have specifically designed sensor pockets welded to the trawl doors. See Installing Sensor Pockets.

Single Trawl

Before you begin

For a single trawl you need:
  • A Master Spread sensor
  • A Starboard Spread sensor

Procedure

  1. Remove the screw holding the pocket cover.
  2. Install the Master sensor (red marker) on the port door and the Starboard sensor (green marker) on the starboard door.
  3. The top of the transducer (side with marker on housing) must be oriented toward the vessel and the side of the transducer with the circle/A must be oriented toward the opposite door.
    Note: Pockets can have an alignment bar that ensure correct positioning of the sensors. Simply slide the sensor into the alignment bar.
  4. Attach the safety line from the sensor to the pocket and fasten the pocket's screw.
  5. Make sure that both sensor transducers are aligned with each other during towing. This way, they can communicate with each other.
  6. Make sure there is nothing in front of the sensors that would block their signal toward the vessel.
    Port Starboard

Twin Trawls

Before you begin

For twin trawls you need:
  • A Master Spread sensor
  • A Starboard Spread sensor
  • A Clump sensor

Procedure

  1. Remove the screw holding the pocket cover.
  2. Install the Master sensor (red marker) on the port door and the Starboard sensor (green marker) on the starboard door.
  3. Install the Clump sensor (black marker) on the clump.
  4. The top of the transducer (side with marker on housing) must be oriented toward the vessel. For Master and Starboard sensors, the side of the transducer with the circle/A must be oriented toward the opposite door. For a Clump sensor, it must be oriented toward the Master sensor on the port door.
  5. Attach the safety line from the sensor to the pocket and fasten the pocket's screw.
  6. Make sure that all three sensors are correctly aligned, to be able to communicate with each other.
  7. Make sure there is nothing in front of the sensors that would block their signal toward the vessel.
    Port Starboard
    Clump

    1. Down sounder (marked with a circle)