Doppler Log JRC JLN-740 Series

The JRC JLN-740 series  is a Doppler log compliant with IMO MSC.96 (72). This model meets the requirements for use on all international ships exceeding 300 reg. With its unrivaled accuracy in measuring speed, the JLN-740 also features a proprietary bubble detection system that reports when measurement accuracy deteriorates due to contact with air bubbles.
The JLN-740 series uses digital signal processing, which, combined with the optimization of existing speed measurement signals and mounting reliability, results in accuracy measurements of up to 0.03 kOhm or 0.3% in all models.

Standard components

• Main display (color LCD / 4.5-inch monochrome LCD)
• Distribution Processor (JLN-740A / N only)
• Signal processor
• Transmitter Mounting

Remote Maintenance System (RMS) -compatible
JRC JLN-740 Series is compatible with JRC's patented Remote Maintenance System (RMS), which uses VDR and JRC satellite communications to remotely communicate with equipment on board the vessel for remote diagnostics and preventative maintenance.

Specifications:

• Operating frequency: 2 MHz (speed relative to water).
• Range of measured speeds (back / forward): -10 - + 40 knots.
• Speed ​​measurement accuracy: 0.1 knots or 1%, whichever is greater.
• Measurement range of the distance traveled: 0.00 - 99999.99 nautical miles.
• Power source: alternating current - 110 - 230 (90 - 235V), 50/60 Hz ± 5%.
•  Power Consumption: 50 W - JLN-740A; 45 W - JLN-740N; 20 W - JLN-741A / N.
• Operating temperature range: -15 ° С - + 55 ° С for all equipment, excluding emitters; - 3 ° С - + 40 ° С for emitters.
• Software Version: NJC-70S - R01.00, NQA-7040 - R01.00, NWZ-510 SWD - 1.001, NWZ-4640 - R74.01.