Simrad PI SPREAD, PI DEPTH QUICK REFERENCE GUIDE

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Quick reference guide

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Simrad PI Spread/Depth dual sensor

Purpose

The PI Spread/Depth dual sensor
measure the physical distance
between the trawl doors as well as the
depth of the trawl door.

Note: Each Spread/Depth sensor can
be configured to communicate with
one of two Remote sensors; Remote 1
or Remote 2. Label the Spread/Depth
sensor accordingly, and ensure that
you only use the sensors in the correct
pairs.

Daily operation

The Spread/Depth dual sensor will
automatically be switched on once the
waterswitch is activated. After startup,
the sensor will interrogate the Remote
sensor to measure the distance. The
distance and the current depth results
are transmitted to the vessel. When
the sensors are not in use, check that
the sensor lamp do not flash, as this
indicates that the sensor is still active
and discharging the batteries.

If you operate with Fast update
rate, the sensors must be charged
approximately every 24 hours. Used
with Normal or Slow update rates, the
operational life is approximately 60
or 80 hours respectively. The optimal
sensor charging temperature is from
+10 to +25° C.

The two rubber inserts provided at
the bottom of each sensor adapter
must not be replaced with any other
types or designs. It is essential that
these inserts provide a secure cradle
for the sensors, but they must also
allow for free water circulation to
allow the sensor’s water switch to
engage. Also, the design of the inserts
allows sand and mud to flow out
when the trawl doors are pulled up
from the water.

Note: Charging sensors at sub-zero
temperatures can create explosive
gasses. Simrad assumes no liability

(A) The Spread/Depth sensor is mounted in a special adapter on the port trawl door.

(B) The Remote sensor is mounted in a special adapter on the starboard trawl door.

(C) The Spread/Depth sensor communicates with the PI system on the vessel.

(E) Using the transverse communication link, the two sensors measure the physical

distance between the trawl doors.

Main parts

(A) Negative charging and fastening lug

(B) Positive charging and fastening lug

(C) Communication link to the vessel

(D) Transverse communication link

(E) Spread/Depth set identification

(F) Water switch with sacrificial bolt

(G) Sensor identification label

for the improper charging of
sensors or the use of chargers not
specified in Simrad’s sensor charging
documentation.

Sensor conguration

On delivery, all Spread sensors are
configured as follows:
Spread: Channel 2 / Fast / Remote 1
Depth: Channels 5, 9 or 1 / Fast

Note: The sensor and the PI system
setup must correspond, otherwise the
communication will not work.

To change the setup, use the PI
Configurator utility.

The sensor update rate controls how

often the sensor reads and reports the
door spread and depth. Three settings
are available; Fast, Normal and Slow.
Note that a faster update rate will
decrease the battery life.

Kongsberg Maritime AS
Strandpromenaden 50
P. O.Box111
N-3191 Horten,Norway

Simrad

Telephone: [phone]
Telefax: [phone]

[e-mail]

www.simrad.com

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Numerical presentation

On the PI display, the distance
between the trawl doors and the
current depth of the port trawl door
are displayed in two numeric displays.
When the readings are stable, the
digits are shown in black colour.
When the values are predicted, the
digits are grey, and if the contact is
lost, the characters *** are shown in
grey. If the transvere communication
link fails, this is indicated with the
characters ±±± .

(A) Sensor identification

(B) Unit of measurement

(C) Distance between the trawl doors

(D) Distance change per minute

(E) Arrows pointing “out”

means that the distance is

Mounting

The Spread/Depth and Remote
sensors must be mounted in dedicated
adapters on each trawl door. These
adapters must be installed aforehand.
Detailed information on how to install
the adapters are provided with the
installation kit.

Installation principle

The Spread/Depth sensor is mounted
on the port door, while the Remote
sensor is mounted on the starboard
door.

Note: It is essential that there is a
clear line of sight between the two
transverse communication “eyes” (one
on each sensor), and between the top
of the Spread/Depth sensor and the
hydrophone on the vessel.

Sacricial water switch

The water switch on your sensor is
a sacrificial brass screw. It must be
checked every month, and whenever
required due to wear and tear, it must
be replaced.

increasing, arrows pointing

“in” means that distance is

decreasing.

(F) Visual alarm

(G) Sensor transmission

indicator

(A) The Spread/Depth sensor is mounted

in a special adapter on the port trawl

door.

(B) The Remote sensor is mounted in a

special adapter on the starboard trawl

door. Optionally, you can use a Remote/

Depth sensor.

(H) Interference warning

(I) Depth

(J) Depth change per minute

(K) Arrow down indicate that

the depth is increasing.

(L) Dual sensor identification

(C) Communication link to the vessel

(D) Optional communication link if

you use a Remote/Depth sensor on the

starboard trawl door.

(E) Transverse communication link

(F) Angle of attack

302875 / Rev.A / November 2007