Calibrating the Catch Sensor

You need to calibrate the catch sensor to make sure you have correct catch measures. This procedure applies for both Catch Explorer and Catch sensors.

About this task

Tip: Watch this short video to see how to calibrate the empty and full status of the sensor.

Catch sensors have two pull cords that are attached to the net. When the trawl fills up, the meshes of the net expand and this pulls the cords. When the cords are pulled up to a certain point, it triggers the catch sensor.

Pull cords can be on the end cap of the sensor (center-pull) or on the side (side-pull). Calibration procedure is the same for both types.

Procedure

  1. Click the tab Catch.
  2. From Catch Mode, check that the catch mode is correct:
    • Center when pull cords are on the end cap on the top of the sensor.
    • Side when pull cords are on the side of the sensor.
  3. To change the threshold at which the catch status becomes full when the cords are pulled:
    1. Click Menu > Expert Mode and enter the password copernic.
    2. Click the Catch tab, then click Pull Cord Triggering.
    3. Adjust the offset. Standard offset is 75%.
    • Set a value below 75% if you want the catch status to become full when the cords are not entirely extended.
    • Set a value above 75% if you want the catch status to become full only when the cords are fully extended.
    Important: For proper operation, do not set the percentage below 65% or above 85%.
  4. To calibrate the catch sensor, from the tab Catch, click Catch Calibration.
  5. Click Catch Calibration.
  6. To calibrate the sensor for the empty status:
    1. Let the cords hang loose.
    2. From Step 2: EMPTY THRESHOLD, click Apply.
      After a few seconds, the Apply button becomes gray.
  7. To calibrate the sensor for the full status:
    1. Pull and hold the cords as far as possible.
    2. At the same time, click Apply from Step 3: FULL THRESHOLD.
      After a few seconds, the Apply button becomes gray. Measures from Empty Threshold and Full Threshold change.

What to do next

You can test the catch sensor to check if the empty or full status appear correctly when the cords are pulled.