L&G EM Speed log 4020Mk2
- Full compatibility with most Walker flush fitting, fixed or retractable speed log sensors and hull fittings.
- Digital Speed and Distance Run displays by red LED dimmable indicators.
- Multipoint speed calibration as speeds from up to 60 knots.
- Removable keypad “calibrator”.
- Built-in Speed Simulator.
- NMEA 0183/RS422 and 200 ppnm outputs to other ship systems.
- Repeater indicators to DIN144 standard (optional).
- Simple to install, operate and service.
- EM Speed Log technology drawn from over 30 years’ experience.
A low frequency AC Electromagnetic sensor induces an electrical voltage in the sea water. This voltage is detected by two electrodes in the sensor face and converted to a speed reading in the Master unit. Distance run is derived by accurately integrating the speed value with respect to time.
Speed Range -20 to 60.0 kts
Resolution 0.1 kt
System accuracy +/- 2%
Calibration accuracy, 0.1 kt 0 to 10 kt,
+/- 1% above 10 kt
Distance
Trip Distance 0 to 99,999.9 nm with front panel reset.
Total distance 99,999.9 nm
Accuracy – integrated from speed to 0.02%
Displays Red LED, dimmable to off
Lamp test built in.
Controls Power On/Off, Simulator On/Off, Set Simulator
Speed, Distance Reset, Lamp Test, Illumination
Up/Down
Interfacing 2 x Outputs – NMEA 0183\RS422.
Sentences VLW and VHW
2 x Outputs – 200 ppnm.
Isolated relay contacts of distance travelled.
To switch max power 10W
max current 0.5A
max voltage 200 vDC
