Simrad PI PORTABLE HYDROPHONE - INSTALLATION REV C User manual

Simrad PI
Catch monitoring system
Portable hydrophone with paravane arrangement
Installation manual
M A X I M I Z I N G Y O U R P E R F O R M A N C E A T S E A
www.simrad.com

851-164730 / Rev.C
Simrad PI
Catch monitoring system
Portable hydrophone installation

Document information
Rev Date Written by Checked by Approved by
Rev.C 06.06.05 RBr KRa KRa
Minor modifications. New illustrations.
© 2005 Simrad AS. All rights reserved.
ISBN 82-8066-056-9
No part of this work covered by the copyright hereon may be reproduced or otherwise
copied without prior permission from Simrad AS.
The information contained in this document is subject to change without prior notice.
Simrad AS shall not be liable for errors contained herein, or for incidental or
consequential damages in connection with the furnishing, performance, or use of this
document.
The equipment to which this manual applies must only be used for the purpose for
which it was designed. Improper use or maintenance may cause damage to the
equipment or injury to personnel. The user must be familiar with the contents of the
appropriate manuals before attempting to operate or work on the equipment. Simrad AS
disclaims any responsibility for damage or injury caused by improper installation, use
or maintenance of the equipment.
If you require maintenance on your Simrad equipment, contact your local dealer. You
can also contact Simrad using the following e-mail address: fish-s[email protected]

Installation manual
1
851-164730 / Rev.C
Introduction
The purpose of this document is to provide general guidelines
for the installation and use of the PI portable hydrophone.
Order numbers
Portable hydrophone, complete; HYD-202713
Portable hydrophone, paravane arrangement kit: KIT-207284
Topics
→General guidelines, page 2
→Deployment over the side, page 3
→Paravane arrangement, page 4
→Storage, page 7

Simrad PI Catch monitoring system / Portable hydrophone
2851-164730 / Rev.C
General guidelines
The following must be taken into consideration when using
portable hydrophones:
•Sharp edges that could damage the hydrophone cable
insulation must be avoided.
•Do step on cable lying on deck.
•Do not place any objects (light or heavy) on top of cable
lying on the deck.
•The hydrophone cable must not be knotted, and kinking must
be avoided.
•When used, the hydrophone should be lowered deeper than
the vessel’s keel.
•Special care must be taken so that the hydrophone an/or cable
do not become fouled in the main propeller, thrusters or gear.

Installation manual
3
851-164730 / Rev.C
Deployment over the side
Unlike permanently mounted hydrophones, the portable
hydrophone has an omni-directional beam. It can therefore be
lowered below the level of high underwater noise and air
bubbles generated by the main propeller and bow/sternthrusters
which can block reception of hull mounted units.
(A) = Portable hydrophone
(P) = Port
(S) = Starboard
When the seine is normally located forward of the starboard
beam when pursing the following information should be taken
into consideration:
•The portable hydrophone is to be deployed over the port side
of the vessel, midships, as far away from bow or stern
thruster(s) used when pursing as possible.
•Note that the portable hydrophone’s location is opposite to
that of a permanently mounted unit. When pursing to
starboard the hydrophone is normally lowered over on the
port side of the vessel.
•The hydrophone cable should be made fast to the vessel’s
bulwarks.

Simrad PI Catch monitoring system / Portable hydrophone
4851-164730 / Rev.C
Paravane arrangement
The portable hydrophone available with the PI system has a
broad coverage area. For this reason, its orientation with regard
to the sensors is not that critical.
The hydrophone weighs approximately 700 grams (in salt
water) and can be mounted on a towed paravane. Simrad can
supply a simple solution for this. This solution is suitable for
smaller vessels, and it is made up of a little paravane and a
weight. The arrangement is designed to draw the portable
hydrophone down to approximate five to ten meters depth when
towed at a moderate speed (maximum of three knots). The kit
contains all necessary parts (except one!) as described in the
following illustration.
Order number: KIT-207284

Installation manual
5
851-164730 / Rev.C
Paravane arrangement, parts
The relevant part numbers in the arrangement kit are provided
in brackets.
(1) Towed hydrophone, portable type. Note that the hydrophone
is NOT a part of the paravane kit, it must be ordered seperately.
Order number is 314-203863.
(2) Paravane made of durable PVC plastic (598-079553).
(3) Paravane line, a two meter lengthofthinflaghalyard(orthe
equivalent) shackled to the round thimble and the middle of the
three holes available on the paravane (699-078608).
(4) Hydrophone cable, extending approximately a half meter aft
of the round thimble. Note that the length of the paravane line
(3) is four times longer than the hydrophone cable (4).
(5) Trolling weight, approximately 5 kg (598-079552).
(6) Hydrophone cable, maximum pay-out length approximately
forty meters (total cable length is 50 meters).
(7) Round thimble, to which a bight in the hydrophone cable is
seized to create an attachment point for the trolling weight and
paravane line (598-079551).
(8) Shackle, made of brass (409-078633)
(9) Swivel, used between the trolling weight and the round
thimble, shackles at each end (409-079550).
(10) Ring, made of stainless steel (409-078702).
(11) Shackle, made of stainless steel (409-086971).
(12) Seizing, used to secure a bight in the hydrophone cable to
the round thimble (not supplied in kit).

Simrad PI Catch monitoring system / Portable hydrophone
6851-164730 / Rev.C
Paravane deployment
All paravane installations require a boom or gantry capable of
towing the hydrophone a minimum of three to five meters
outboard of the vessel. This is important in order to avoid
interference caused by the main propeller turbulence.
Should a portable hydrophone be
towed in the wake of a vessel, its
range will be severely reduced due
to the associated main propeller
wash which is saturated with air
bubbles blocking the sensor
signals. Systems incorporating
hydrophones towed in this manner
can be expected to barely work, if
at all.
(A) Towed hydrophone, included
with portable type hydrophone
(314-203863).
(B) Paravane, included with
KIT-207284.
(C) Trolling weight, included with
KIT-207284.
(D) Snatch block, not available
from Simrad.
(E) Boom, not available from
Simrad.
(F) Hydrophone cable, included
with the portable hydrophone.
(G) Bight, in hydrophone cable
secured with an elastic strop to
dampen dynamic stress on the
hydrophone cable, not available
from Simrad.