Simrad PI TEMPERATURE - QUICK REFERENCE GUIDE REV B,PI Temperature Quick Reference Manual

QUICK REFERENCE GUIDE

PI Temperature sensor

Purpose

The PI Temperature sensor monitors
the current water temperature at the
chosen location on the purse seine or
trawl.

(A) = The sinking
rate of the net is
monitored by two
Depth sensors

(B) = One
Temperature
sensor is mounted
on the footrope
to monitor the
location of the
thermo-cline.

(C) = One
Temperature
sensor is mounted
on the headrope
to monitor if
the sea water
temperature is
favourable for the
target species.

Daily operation

Once installed and put to use, the
sensor will automatically be switched
on once the waterswitch is activated.
After an initial startup, the sensor starts
transmission of the current temperature.
When the sensor is not in use, check
that the sensor lamp (D) is not flashing
from time to time, as this indicates that
the sensor is on and is discharging its
batteries.

If you operate with Fast update rate, the
sensor must be charged approximately
every 24 hours. Used with Normal
or Slow update rates, the operational
life is approximately 75 or 150 hours
respectively. The optimal sensor charging
temperature is from +10 to +25° C.

Note that charging sensors at sub­zero temperatures can create explosive
gasses. Simrad AS assumes no liability
for the improper charging of sensors
or the use of chargers not specified in
Simrad’s sensor charging documentation.

Note that charging sensors at sub-zero
temperatures can create explosive gasses.

Main parts

(A) = Negative charging and fastening lug
(B) = Positive charging and fastening lug
(C) = Communication link with vessel
(D) = Location of sensor lamp
(E) = Water switch sensor
(F) = Temperature sensor

Sensor configuration

On delivery, all temperature sensors are
configured in Channel 8 and with Fast
update rate. If you use more than one
sensor, you must set them up to operate in
different channels.

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

To change the sensor setup (channel
selection), use the PI Configurator utility.

The sensor update rate controls how
often the sensor reads and reports
the current depth. Three settings are
available. Note that a faster update rate
will decrease the battery life.

Fast (~4,5 sec): Recommended for purse
seine or trawl, allows immediate update
of changes in the sea temperature.

Normal (~14 sec): Recommended for
trawl and normal fishing with fairly
constant sea temperatures.

Slow (~34 sec): Recommended if you

System configuration

Sensor configuration: The sensor
must be configured with a unique sensor
number. Select channel number according
to the sensor’s configuration. Write down
the configuration for future reference.

Status & Receiver: The Interference
filter must be switched on. Set it to level
9 if you have noise problems from other
hydroacoustic sources. Note that with
the filter on, it will influence the signal
spectrum shown in the Status display.

Sensor filter: Switch this filter to Light.
Set it to Heavy only if you experience
excessive noise. Position Off will provide
raw data and fastest possible response.

experience constant sea temperatures, or if
maximum operational battery life before
charging is required. The system will be
more sensitive to bad communication
conditions due to the slow data update.

A

A

B

(CD11203A)

C

(CD11203B)

Simrad AS assumes no liability for the
improper charging of sensors or the use of
chargers not specified in Simrad’s sensor
charging documentation.

E

F

)

)

A

A

B

C

B

D

(CD11201H)

857-165108 / Rev.B / February 2005

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

Depth presentation

On the PI display, the temperature is
displayed in the numeric display. If the
temperature is falling or rising, this is
shown with an arrow. 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 with
the sensor is lost, the characters *.* * are
shown in grey.

(A) = Sensor set up
as sensor no.2.
(B) = Current
temperature.
(C) = Denomi­nation (Celcius or
Fahrenheit)
(D) = Temperature
change. This arrow
indicates that the temperature is rising.
(E) = Graphic alarm
(F) = Indicator, lit for every sensor interrogation.
(G) = Interference symbol.

Purse seine: In order to secure stable
communication with the vessel’s
hydrophone, it is very important that the
sensor is allowed to hang freely with
the top end pointing towards the surface
during shooting and pursing.

Attach the sensor to a standard purse
ring with two separate wires (A). Mount
one end of each wire to a common snap
hook (B), and place another snap hook at
the other end of each wire to snap onto
the sensor.

Mount a safety line (C) between the
sensor and the adjacent bridle/purse ring.
Make sure that security line does not
prevent the sensor from hanging freely!

Remove the sensor from the purse seine

(CD11201A)

(CD11201B)

(CD11201I)

A A

C

B

Mounting

before it passes through the power block.

Any attachment material “permanently”
attached to the sensor’s charging lugs
must not form an electrical connection
between the two charging lugs shorting
the charging current.

(A) = Two wires with a snap hook in
one end and the other end attached
permanently to (B).
(B) = Large snap hook.
(C) = Safety wire with snap hooks on
each end. Note that the upper end is NOT
attached to the purse seine wire.

Tuna purse: The sensor must not be
attached to the footrope wire, but to the
foot-rope chain. Use a safety wire in
addition in case the sensor is ripped off
the net.

Trawl or Danish seine: The depth
sensor is normally attached to the
headrope. For secure fastening and stable
positioning of the sensor pointing towards
the vessel, make a fine mesh bag sized
to the middle of the head-rope. Size two
snap hooks approximately 10 - 15 cm
from the headrope forming a bridle, and
keep the sensor stretched by means of two
rubber straps attached to the aft fastening
lugs.

(CD11009C)

A

D

E

G

B

C

F