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12 May 2010. Transas knows how: safe data download to ECDIS via Internet connection onboard |
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SAL T3 combines the speed log features with echo sounding – measuring longitudinal relative speed through water as well as two-axis true speed over ground and water depth down to 250 metres The SAL T-series is the first type-approved combination of speed log and echo sounder in one housing using only one combined transducer. In combination with an external Rate of Turn Gyro a full docking log functionality is achieved. Electronics Unit – ELC: The ELC controls the measurements of the system. It contains two independent units, one unit for speed through water and another for depth and speed over ground measuring. Also the depth and the speed over ground systems have full redundancy. Both measuring functions are based on the acoustic correlation principle. The basic concept is the measurement of the time delay between the characteristics of reflected sonic pattern sensed by the receivers. The time delay from transmission till echo reception is used for depth estimation. Echo signal modulation is used for speed estimation. The speed is estimated from the fix distance between sensor elements divided by the estimated time delay from correlation, where two signals are compared by shifting one relative to the other in time, and choosing the time shift where the maximum similarity is found. The speed data calculated in the ELC is sent as serial IEC61162-1 / NMEA messages for further processing in the LPU or directly to any other user. Log Processing Unit – LPU: The LPU is mounted on the wheelhouse area and receives the NMEA message from the ELC. The LPU has various options to perform message conversion and calculations and has also variety of inputs for receiving data from other units. Various outputs are available for external users, such as autopilot, radar, AIS, VDR, fin stabilizers etc. Transducer – TRU: The combined transducer is mounted in a sea valve arrangement suitable both for single and double bottom designs. The transducer incorporates as standard a 30 metres cable for connection to the ELC. By means of separate crystals, both relative water speed and true speed over ground and water depth are measured. The crystals work both as transmitters and receivers. Serial Digital Indicators – SD1/SD2: The SD1/SD2 series of indicators gives a flexible solution to the presentation of longitudinal and transverse speed and distance measurement. Echo Sounder Display – ESD: The ESD gives a comprehensive graphic overview of the echo sounder presentations.
Specification:
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SAL T1 combines the speed log features with echo sounding – measures relative speed as well as bottom track speed in combination with water depth down to 250 metres. SAL T-log is the first type-approved combination of speed log and echo sounder in one housing using only one combined transducer. Electronics Unit – ELC: The ELC controls the measurements. It contains two independent units, one for speed through water measurement and a combined depth and speed over ground measurement. Both the depth and speed functions are based on the acoustic correlation principle. The basic concept is the measurement of the time delay between the characteristics of reflected sonic pattern sensed by the receivers. The time delay from transmission till echo reception is used for depth estimation. The echo signal modulation is used for speed estimation. The speed is estimated from the fix distance between sensor elements divided by the estimated time delay from correlation, where two signals are compared by shifting one relative to the other in time, and choosing the time shift where the maximum similarity is found. The speed data calculated in the ELC is sent as serial IEC61162-1 / NMEA messages for further processing in the LPU or directly to any other user. Log Processing Unit – LPU: The LPU is mounted on the wheel house area and receives the NMEA message from the ELC. The LPU has various options to perform message conversion and calculations and has also variety of inputs for receiving data from other units. Various outputs are available for external users, such as autopilot, radar, AIS, VDR, fin stabilizers etc. Transducer – TRU: The combined transducer is mounted in a sea valve arrangement suitable both for single and double bottom designs. The transducer incorporates as standard a 30 metres cable for connection to the ELC. Both speed and depth are measured with this one combined transducer that is equipped with separate crystals for bottom measurement as well as for water track measurement. The crystals work both as transmitters and receivers. Serial Digital Indicators – SD4: The SD4 series of indicators gives a flexible solution to the presentation of longitudinal speed, distance and depth measurements. Echo Sounder Display – ESD: The ESD gives a comprehensive graphic overview of the echo sounder presentations.
Specification:
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The SAL T2 measures longitudinal relative speed through water as well as two-axis true speed over ground. In combination with an external Rate of Turn Gyro a full docking log functionality is achieved. Electronics Unit – ELC: The ELC controls the measurements. It contains two independent units, one for speed through water measurement and one for speed over ground measurement. Both measuring functions are based on the acoustic correlation principle. The basic concept is the measurement of the time delay between the characteristics of reflected sonic pattern sensed by the receivers. Echo signal modulation is used for speed estimation. The speed is estimated from the fix distance between sensor elements divided by the estimated time delay from correlation, where two signals are compared by shifting one relative to the other in time, and choosing the time shift where the maximum similarity is found. The speed data calculated in the ELC is sent as serial IEC61162-1 / NMEA messages for further processing in the LPU or directly to any other user. Transducer – TRU: The combined transducer is mounted in a sea valve arrangement suitable both for single and double bottom designs. The transducer incorporates as standard a 30 metres cable for connection to the ELC. This one combined transducer that is equipped with separate crystals for relative water speed and true speed over ground. The crystals work both as transmitters and receivers. Log Processing Unit – LPU: The LPU is mounted on the wheelhouse area and receives the NMEA message from the ELC. The LPU has various options to perform message conversion and calculations and has also variety of inputs for receiving data from other units e.g. Rate of Turn Gyro for docking functionality. Various outputs are available for external users, such as autopilot, radar, AIS, VDR, fin stabilizers etc. Serial Digital Indicators – SD1/SD2: The SD1/SD2 series of indicators gives a flexible solution to the presentation of longitudinal and transverse speeds and distance measurement. Multi Function Display – MFD (option): The MFD shows all information of the Docking Log System both in accurate digital read-outs and easy-to-read analogue bar graphs.
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SAL R1a is the fourth generation acoustic correlation SAL speed log for measuring relative speed – speed through the water. The log is designed to meet requirements as specified by authorities and shipowners. Its performance exceeds the various IMO specifications and has proven reliability in many thousand installations worldwide. Main features of the SAL R1a log:
The basic version of SAL R1a includes bottom arrangements – alternatively with or without sea valve, transducer, electronics unit all mounted in the bow area and SD-indicators as selected installed in the bridge area. The unit provides serial output signal according to IEC 61162-1 (NMEA 0183) as well as 200 pulses per NM and analogue voltage output. The electronics are mounted on a circuit board enclosed in a splash proof steel box. Cable glands are provided in the bottom plate of the box. Bottom arrangements are available for both single and double bottom hull constructions including sea valve for easy access and maintenance, and if necessary, exchange of transducer from inside without dry-docking.
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