May 6th, 2010 
molitva leyli PI SeineSonder is net depth sensor, provides vertical position of the gear, measures both the depth of bottom net/footrope and the height above the seabed, products from Simrad, a part of Kongsberg Maritime’s Subsea division, a forerunner in the electronic technology for commercial fishery and fishery research.
Purse seine, The PI SeineSounder is mounted vertically below the footrope. From this position it transmits accurate information about the height above the seabed and the depth.
Trawl and Danish seine, The PI SeineSounder is mounted horisontally behind the headrope.
The Simrad SeineSounder is placed vertically on the footrope, and measures both the depth (A) and the height above the seabed (B).
Depth Sensore Purpose
The Simrad PI SeineSonder does two jobs at the same time. From its position on the footrope it will measure the depth from the sea surface and the height over the seabed.
Depth Sensor Daily operation
Once installed and put to use, the sensor will automatically be switched on once the waterswitch (the LONG bolt) is activated. After an initial startup, the sensor starts transmission of the current depth and height. When the sensor is not in use, check that the lamp (D) is not flashing, as this indicates that the sensor is active and discharging its batteries. In this case, wash the sensor in fresh water. If you operate with Fast update rate, the sensors must be charged approx. every 24 hours. Used with Normal or Slow update rates, the operational life is approx. 60 or 80 hours respectively. Optimal sensor charging temperature is from +10 to +25° C.
Note: Charging sensors at sub-zero temperatures can create explosive gasses. Simrad assumes no liability for improper charging of sensors, or the use of chargers not specified in Simrad’s sensor or charger documentation.
Depth Sensor Configuration
On delivery, all SeineSounders are set up to channel 14 (Height) and channels 5 (depth 300 m), 9 (600 m) or 1 (1000 m), and with Fast update rate.
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 height. Three settings are available. Note that a faster update rate will decrease the battery life. Fast: Recommended for new equipment, or if you are not familiar with the bottom conditions.Normal: Provided for normal use. Slow: Recommended for long operational time. The system will be less sensitive due to the slow data update.
Depth Sensor System configuration
The sensor must be configured with to unique sensor numbers. Select the same update rate for both, and use channel numbers according to the sensor’s configuration. Write down this configuration for future reference.
On the receiver, the Interference filter must be switched on. Set it to Level 9 if you have noise problems from other hydroacoustic sources. Note that this filters will influence the signal spectrum shown in the Status display. We recommend that you set the sensor filter to Light.
Depth Sensor Numerical presentation
On the PI display, you must use two channels to receive the information from the SeineSounder. The depth and height values are then shown in the numeric display. If the height or depth is increasing or decreasing, this is shown with two arrows and the variation in meters per minute.
You can also see the depth and height changes as a function of time in a graphical presentation.
When the readings are stable, the digits are shown in black colour. If the contact is lost, the characters *** are shown in grey. If the height is out of range, the displays shows ???.
Depth SensorMounting
In order to secure a stable communication with the vessel, and to measure the height, 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 chains (A). Mount one end of each chain to a common snap hook (B), and secure the hook on the footrope. Mount the other end of each chain to one of the sensor’s lower using two sturdy quick links.
Mount a safety wire (C) between one of the sensor’s lower lugs and anywhere on the net except on the footrope. Make sure that security line does not prevent the sensor from hanging freely!
Remove the sensor from the purse seine before it passes through the power block. Ensure that mounting material attached to the charging lugs do not form an electrical connection, as this will short the charging current.
Depth Sensor Technical specifications
We reserve the right to alter these specifications without prior warning.
PI systems: PI32, PI44 and PI54
Communication:
• Frequency range: 43,5 to 49, 5 kHz
• Opening angle: 65 degrees
• Source level: 194 dB//1?Pa, 1 m
(maximum)
Update rates:
• Fast: 5 seconds
• Normal: 15 seconds
• Slow: 35 seconds
Charging:
• Up to 70% capacity: 1 hour
• Up to 100% capacity: 4 hours
Operational time between charging:
• Fast: Approximately 24 hours
• Normal: Approximately 60 hours
• Slow: Approximately 80 hours
Echo sounder:
• Minimum depth: 70 cm
• Maximum depth: 100 m (depending on bottom conditions)
• Frequency: 70 kHz
• Opening angle: 55 – 70 degrees
Depth sensor:
• Ranges: 300, 600, 1000 meter defined by the sensor lid
• Accuracy: 0,25% of the depth
Physical dimensions:
• Length: 300 mm
• Width: 205 mm
• Thickness: 131 mm
• Weight in air: 7 kg
• Weight in water: 2,7 kg
For more detile please fisit http://www.simrad.com/
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