Operation Manual

Operational procedures
67
850-165186 / Rev.B
How to set up a Twin Spread sensor for
twin trawl applications
By means of the Twin Spread sensor, you can set up your PI54
to monitor the openings on a twin trawl. Apart from the Twin
Spread sens or, you will also need two Remote sensors.
Sensor configuration
The Twin Spread and Remote sensors are supplied in sets, and
they MUST operate in these sets. The sets are:
• Twin Spread 1 uses two Remote sensors; Remote 1 and
Remote 3.
• Twin Spread 2 uses two Remote sensors; Remote 2 and
Remote 4.
When supplied from the manufacturer, all Twin Spread sensors
are set up as Twin Spread 1. If you wish to use a Twin Spread 2,
your dealer (or yourself) must reconfigure t he sensor using the
PI Configurator application.
Communication channels and update rate
Each Twin Spread sensor will communicate on two channels,
one for each of the two distances the sensor measures. By
default, these communication channels are set to 02 and 07.
• Channel 02 is used to measure the distance to Remote 1.
• Channel 07 is used to measure the distance to Remote 3.
By default, both communication channels are set up with Fast
update rate. In order to increase the lifetime between each
sensor charging, you may consider changing to Normal update
rate.
If you wish to reconfigure the settings, your dealer (or yourself)
must use the PI Configurator application.
Placing the sensors on the trawl
The Twin Spread sensor must be mounted on the port trawl
door, and the three communication transducers on the sensor
must not be obstructed. Ensure that you have a clear line of
sight between the tip of the Twin Spread sensor and the vessel,
and between the Twin Spread sensor and the two Remote
sensors.
Remote 1 is placed on the centre clump.
Remote 3 is placed on the starboard door.