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PI Spread/Depth Sensor
The PI Spread/Depth dual sensor measure the physical distance between the trawl doors as well as the depth of the trawl door.
The PI Spread/Depth is a "dual" sensor, and it performs the following tasks:
It communicates with the PI Remote sensor to measure the distance between the trawl doors, and transmits the current distance to the PI operator unit.
It measures the current depth and transmits this information to the PI operator unit.
Note that the PI Remote sensor may be replaced with a Simrad PI Remote/Depth sensor. This will provide you with the depth of both trawl doors.
Why should you use this sensor?
The current depth of the trawl door is important information for efficient catch.
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.
The PI Spread/Depth is placed on the port trawl door, and commonly used with the PI Remote/Depth sensor on the starboard door. This configuration will provide you with the accurate depth of both trawl doors.