The sensor developed for catch detection provides you with information about the filling rate of fish in the cod end. Many trawlers choose to use two or three sensors on the gear to monitor the filling rate more accurately.
The PI Catch sensor is a general purpose single measurement sensor designed to detect physical changes to the net. Position this sensor on the cod end. As the net is filled with fish it will strech, and this is detected by the sensor.
Spread measurements will also detect catch
When the cod end is filled with fish the weight of the trawl will pull the trawl doors together. This movement is detected by the spread sensors.
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