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Features
Acoustic Correlation
The correlation system eliminates the effects of water temperature and salt concentration for more accurate and stable measurements.
This enables high-accuracy measurements of ship speeds through water and over ground during pier docking and undocking.
Ultrasonic waves are emitted simultaneously in the vertical direction from multiple transducers, and the correlation of these waves is used to measure the ship speed. This eliminates the variations due to the propagation speed of the ultrasonic waves and changes in their angles.
One Speed Log for Compliance with Installation Requirement for Ships Exceeding 50,000 GT
* MSC 334(90) effective from 1 July 2014
In the installation requirements*, it is stated that separate speed and distance measuring devices must be fitted on ships of 50,000 GT and over for measuring the speed and distance through the water and over the ground. The JLN-900 is designed so that the system for measuring the speed and distance through the water is completely separated from the system for measuring the speed and distance over the ground. For this reason, major classification societies have recognized compliance with this requirement using only this speed log. The JLN-900 enables satisfying of the installation requirements with a minimum of equipment and costs.
Combined transducer unit for both ground and water speed measurements
Separate transducer units for both ground and water speed measurements are used in an integrated design. This enables the device to be fitted using a single gate valve and aperture in the ship bottom for reduced costs.
Displays
System Diagram
Diagram
Dimensions
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Signal processor NJC-80 Mass : 18 kg 
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Signal distributor NQA-4480 Mass : 20 kg 
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Main display NWW-82 Mass : 0.6 kg 
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Tansduce CFT-780 Mass : 23 kg 
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Sea valve NKF-9800 Mass : 125 kg 
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