Simrad PI DEPTH Specifications Page 35

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Applications
23
857-164636 / Rev.A
Bottom trawl
When used f or bottom t rawling, the PI32 system will give you
all necessary info rmation about the trawl status. You should
have minimum three of the following sensors attached to the
net: Depth sensors(s), Bottom Contact sensor, Rip sensor and
Catch sensors(s).
The system is designed to be used with up to three sensors. We
recommend that you use a Catch sensor, a Height sensor behind
the headrope and a Spread sensor. Sensor configuration can be
tailored to suite individual needs.
(A) = Depth sensor (headrope)
(B) = Depth sensor (footrope)
(C) = Bottom contact sensor
(D) = Rip sensor
(E) = (F) = Catch sensor(s)
Using the r ecommended sensors, the PI32 system will provide
the following information:
Optimal vessel speed with regard to net sink rate and bottom
approximation.
When the codend is full.
Footwire/bottom lift-off.
Net opening (using two depth sensors) and damage
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