Operation Manual

Sensors
151
850-165186 / Rev.B
Sensor configuration
You can operate two sets of Twin Spread sensors, these sets are
identified as Twin Spread 1 and Twin Spread 2.
Twin Spread 1 uses two Remote sensors: Remote 1 and 2.
Twin Spread 2 uses two Remote sensors: Remote 2 and 4.
On delivery, all Twin Spread sensors are configured as Twin
Spread 1 in Channels 2 and 5, with Fast update rate, and for use
with Remote sensors 1 and 3. T he four Remote sensors can be
ordered pre-programmed from Simrad, but if you wish to use a
Twin Spread 2 set-up you must re-configure a Twin Spread 1
sensor using the PI Configurator utility.
Note: The Twin Spread sensor and the PI5 4 system setup must also
correspond, otherwise the communication will not work.
The sensor update rate controls how often the sensor reads and
reports the door spread. Three settings are available. Note that a
faster update rate will decrease the battery life.
• Fast (~5,5 sec): Recommended for new trawl or gear or
changes in rigging to monitor any instabilities or unexpected
changes. This mode provides the shortest battery life before
charging.
• Normal (~14 sec): Recommended for well known trawl, gear
and door behavior with stable situations. Use this setting
during normal conditions.
• Slow (~34 sec): Recommended to monitoring a stable
situation over time, focus on door not falling over, broken
sweep lines etc. during the tow. The PI54 system will be
more sensitive to bad communication conditions due to slow
data update. This mode provides longest operational battery
life before charging.
System configuration
Sensor configuration: The sensor must be configured with a
unique sensor number. Select channel number and update rate
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 t hat 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.