Simrad PI GEOMETRY Manuale utente

Simrad PI Geometry

Sensor system for trawl and danish seine

(CD012221-002)

TECHNOLOGY FOR SUSTAINABLE FISHERIES

www.simrad.com

Simrad’s latest sensor system measures the geometry

of you gear. If your trawl or danish seine is skewed and

misadjusted, you will know right away!

From the main Geometry sensor mounted on the middle of either the headrope or

the footrope, you measure the distance to the two “Mini-R” responders mounted on

each door or wing ends. These measurements will immediately tell you if the trawl

(or danish seine) is skewed due to water current or incorrect warp lengths. You will

thus easily detect large or small changes in the trawl geometry, and can rapidly take

corrective actions to maintain maximum catch efficiency.

(CD012221-008)

In order to maximize the performance

and the catch efficiency, the trawl and the

warps must be adjusted properly. This

is essential to ensure a square trawl and

minimum skew. This is also important

for danish seines, as the ropes must have

identical length.

Any disturbance to the trawl movements

may have a negative effect on the catch.

This is particularly important on a bottom

trawl. Askewed bottom trawl will result

in unstable bottom contact, and create

escape routes for fish below the gear

and through the side panels. On pelagic

trawls and danish seines a skewed net

will make the gear unstable, and the catch

be reduced. Optimal trawl geometry is

therefore vital for maintaining the catch

efficiency.

A trawl or danish seine may be skewed

for several reasons. Some of these reasons

are:

• Incorrectriggingoftrawl,sweep

lines or trawl doors

• Misadjustedwarplengths

• Sidecurrent

• Towinginsteeporslopededges

If the rigging of the trawl is correct,

you can easily compensate for skew by

adjusting either port or starboard wire

length.

The PI Geometry sensor system is based

on the fact that a correct rigged trawl and

danish seine has exactly the same distance

measured from the centre of the headrope

or footrope to either door or trawl

wing. These distances must be identical

independent of weather conditions, sea

state or water currents.

Advantages

Bottom and pelagic trawls:

• Measuresifthetrawlisskewed.

• Allowsyoutocorrectthetrawl

geometry by adjusting the warp

lengths.

Danish seines:

• Detectsvariationsinthedistance

from the centre of the headrope (or

footrope) to either wing of the seine.

• Detectsdifferencesintherope

lengths when the seine is closed

(distances between the wings should

then be close to zero).

Why use the PI Geometry sensor system?

On the left trawl,

distance “A” on the

port side is longer

than distance “B”

on the starboard

side. The trawl is

unbalanced. On

the right trawl,

the distances are

identical. Measuring

the door spread

(“C”) will not detect

a distorted trawl

geometry.

326136 / Rev.A / September 2008

Kongsberg Maritime AS

Strandpromenaden 50

P. O.Box111

N-3191 Horten,Norway

Simrad

Telephone: +4733034000

Telefax: +4733042987

simrad.sales@simrad.com

www.simrad.com

X1 [m]

143.5



X2 [m]

143.5



(CD012221-007)

ABC

Clear and precise

numerical information

The numerical presentation of the PI

Geometry data is automatically shown

in the relevant display modes. Since this

is a “dual” sensor two yellow rectangles

are used to indicate which two numerical

displays that provide information from the

same sensor.

ASensor identification

BUnit of measurement

CDistance

DDistance changes per minute

EArrows pointing “out” means that the

distance is increasing, arrows pointing

“in” means that distance is decreasing

FVisual alarm

GSensor transmission indicator

HInterference warning

IDual sensor identification

Graphic presentation

This example shows a graphic display

with PI Spread and PI Geometry sensors

connected. The top line shows the

distance between the trawl doors. It is

currently 69,5 meters, and the distance

is increasing with 2 meters per minute.

The PI Geometry sensor detects that the

distances between the centre of the trawl

opening and the two trawl doors are

currently identical and 147,0 meters. The

distances are changing with 0,5 meter per

minute. The graphical presentation further

presents the historic values from within

the past 17,5 minutes.

17.5 12.5 10 7.5 52.5

15 min

38kHz 1000W MEDIUM T 22.5 C

oS 7.2kn DK 1050 m

(CD012106-001)

S1[m] X2[m]

69.5147.0

0.5

X3[m] 147.0

100

150

200

250

0.5

In this example the two responders are positioned with identical distances to the PI

geometry sensor. The gear is in balance, and no adjustments are required.

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