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Speed Log JLN-900

Speed Log JLN-900

Full compliance with IMO MSC.334 (90)
using a single device

  • Enables measurement of ship speeds over ground up to depths of 250 m
  • Three axis* SOG and one axis STW
  • Correlation technology
  • Compact, lightweight gate valve included as standard
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Description

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.

 

Spesification :

Specifications

Accuracy of measurement
Speed Through Water (STW)
FrequencyIn the range 3.8 – 4.2 MHz Speed is measured in a water volume 120 – 140 mm from the surface of the transducer
Depth requirementgreater or equal to 3 m beneath the transducer
Speed range± 50 knots sensed Speed Through the Water
Speed accuracy≦ 0.1 knot or 1.0 % whichever is greater
Speed Over Ground (SOG)
Frequency150 kHz
Depth requirementgreater or equal to 2 m beneath the transducer
Depth rangeNominally 2 – 250 m below transducer
Speed range40 knots in any direction
Depth accuracy≦ 0.2 knots or 2.0 % whichever is greater
Travell distance of measurement
RangeTotal: 9999.99 NM, Trip: 9999.99 NM
Distance accuracyDistance travelled through the water ≦ 1.0 %
travelled distance2 to 10 NM ≦ 0.2 %, 10 to 50 NM ≦ 0.1 %, Over 50 NM ≦ 0.05 %
Serial output
Digital output① 23 serial outputs [IEC 61162 – 1 Ed.4.0 (2010) (NMEA 0183 V – 4.00)]
② 200 p/NM speed output pulses (4 change over contacts, 4 closing contacts, 8 opto couplers)
Analog output± 0.1 V / 1 NM
Electrical specification
Signal processor
NJC-80		Voltage: 220 – 230 VAC (198 – 253), 100 VAC (90 – 110), optionaly 115 VAC (100 – 126), Frequency: 47.5 – 63 Hz, Power consumption: typical 50 VA, peak at start up 300 VA
Signal distributor
NQA-4480		Voltage: 220 – 230 VAC (198 – 253), 100 VAC (90 – 110), optionally 100 – 115 VAC (90 – 126), Frequency: 47.5 – 63 Hz, Power consumption: typical 15 VA, peak at start up: 150 VA including 3 pcs Display connected
Main display
NWW-82		Voltage: 12 – 24 VDC (10 – 32), Power consumption: typical 1.5 W peak 3 W

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Speed Log JLN-900

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