Operation Manual

Sensors
115
850-165186 / Rev.B
PI Catch sensor
Purpose
The PI Catch sensor detects when the trawl has been filled with
fish. The sensor monitors the opening of the meshes in the cod
end, and will be activated once the volume caught is enough to
pull the detector wires.
Catch sensor principle: Three sensors are
mounted at the cod end of the trawl to detect the
amount of fish caught.
Main parts
(A) = Negative charging / fastening lug
(B) = Positive charging / fastening lug
(C) = Communication link
(D) = Location of sensor lamp
(E) = Water switch sensor
(F) = Detection wires
Daily operation
To monitor the filling rate, we recommend that
you use minimum two sensors. The first sensor is
located at the far end of the cod-end indicating
that the trawl is fishing, while the second sensor
tells when to haul. Due to the fish m oving back
and forth in the cod-end, the sensor will normally
change status (on/off) several times until the
volume caught keeps the opening of the meshes
stable.