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The purpose of the PI Remote/Depth sensor is to achieve accurate measurements of both the water depth and the distance between the two trawl doors.
In order to measure the distance, it must be installed as a "slave" in a pair with PI Spread sensor. The sensor performs the following tasks:
- It communicates with the PI Spread sensor to measure the distance between the trawl doors.
- It measures the current depth and transmits this information to the PI operator unit.
- On a bottom or semi pelagic trawl you will need to know when the trawl door hits the bottom.
- On a pelagic trawl you will need to know the depth of the trawl doors to make sure that your gear is on the same depth as the catch.
- On a pelagic trawl you need to position the trawl doors on identical depths in order to obtain a good geometry, and to avoid an inclined trawl opening.
- On a pelagic trawl a door may accidentally surface, for example if you turn the vessel. In darkness or with very long tow lines this may occur without your knowledge. Depth monitoring will prevent this from happening.
- On any trawl, the balance of the trawl doors may be affected by the sea current. This lack of balance will often cause one or both doors to change depth. This is then easily detected when a sensor is used on one or both doors.
- Please note that the PI Spread sensor may be substituted with a PI Spread/Depth sensor.
The current depth of the trawl door is important information for efficient catch.
The PI Remote/Depth is placed on the starboard trawl door, and commonly used with the PI Spread/Depth sensor on the port door. This configuration will provide you with the accurate depth of both trawl doors.