Simrad PI54 A Specifications Page 33

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Getting started
21
850-165186 / Rev.B
Pelagic trawl: On a pelagic trawl, this sensor proves very
useful when the trawl moves downwards. It will let you
know immediately if the footrope touches bottom.
Purse seine: When you work with a purse seine, you need to
know when the seine reaches the bottom. This sensor will let
you know. once it happens.
Danish seine: Used on a Danish seine, the sensor will let you
know when the net has a stable bottom contact, and when it
is time to haul.
Scientific research: During scientific surveys, an exact
definition of towed distance with proper ground gear contact
is an essential parameter in bottom trawl swept area estimates
of fish abundance. Using a Bottom Contact sensor will
reduce errors in this key parameter.
Catch sensor: When is the trawl full?
This is your “eye” at the cod-end. With PI Catch sensors in use,
you can easily monitor the fi lling rate and the amount of catch
in the trawl. Save time and fuel, haul in the trawl at the right
moment! The design is rugged and awardwinning, and the
sensors sensitivity is easily adjustable for trawls of all sizes.
Some professionals claim that the Catch sensor is the most
important sensor on the trawl. Why? Because it will tell you the
amount of catch in the trawl.
The sensor simply monitors the expansion of the meshes in the
cod-end. Once the volume caught is enough to expand the
meshes, they will pull the detector wires and engage the sensor.
The sensitivity of the sensor can easily be adjusted, just extend
the detection rubber bands to span additional meshes.
To monitor the filling rate, we recommend that you use
minimum two sensors. Place the first sensor at the far end of the
cod-end, it will tell you that the trawl is actually fishing. Place
the second sensor closer to the trawl opening. Once the trawl is
filled to the chosen location, the sensor is engaged, and you
know that it is time to haul.
Use the PI Catch sensor to adjust the catch volume according to
the production capacity, check that the trawl is fishing, adjust
the caught volume to secure quality, and minimize the towing
time to save fuel. These are only a few of the reasons why this
sensor is considered to be so important.
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