Introduction; Purpose And Applications - Simrad PI GEOMETRY - REV B Instruction Manual

INTRODUCTION

Purpose and applications

322482/B
Efficient fishery with trawl and purse seine assumes professional
and adequate instrumentation on the gear. This manual describes
installation, use and maintenance of the Simrad PI Geometry
sensor when put to use with one of the Simrad PI catch
monitoring systems.
The purpose of the Simrad PI Geometry sensor system is to
monitor the geometry of your trawl or danish seine. This is
achieved by making accurate measurements of the distances
between the centre of the headrope above the trawl opening (or
the footrope at the bottom) and each of the trawl doors or wing
ends. If these distances are not identical the trawl (or danish
seine) will be skewed and unbalanced, and this reduces the catch
efficiency. The Simrad PI Geometry sensor system has been
developed to be used on both bottom and pelagic trawls, as well
as pair trawls and danish seiners. In addition to the PI Geometry
sensor, the system uses two PI Mini-R transponders. These are
mounted on the trawl doors (or trawl wings).
Note
Two PI Geometry sensor configurations are available,
the standard type and the XT. The standard PI Geometry
configuration is used when the distance between the PI Geometry
sensor and the trawl doors is below 300 meters, and will provide
the best accuracy for shorter distances. The PI Geometry XT
configuration can be used for maximum distances up to 600
meters. The XT configuration does not provide the same accuracy
as the standard configuration. Use this only if the standard
configuration can not be used. To change configuration, use the
PI Configurator application.
The results from the measurements are transmitted by acoustic
signals to the PI catch monitoring system mounted on the vessel,
and if necessary you can take corrective actions.
Introduction
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