Wärtsilä SAM 4642 is a navigation 2 axis electromagnetic speed log for measuring longitudinal and transverse speed through water. A mile counter and a water temperature sensor is included. Speed information can be relayed to a radar, AIS, VDR and all other relevant devices via NMEA-format connections. Interfaces between the operator unit, electronic unit and sensor comply with IEC 61162 specifications. All relevant IMO requirements are met or exceeded.
Transducer and Transceiver
SAM 4642 sensor is connected to the electronic unit located within 40 m of the sensor. The connection from the sensor to the electronic unit is via a serial RS-422 data link as well as the connection from the electronic unit to the operator unit. The link between electronic unit and operator unit may be up to 300 m. Power supply is via 230 VAC/115 VAC or 24 VDC. The power consumption is approximately 100 Watts.
The display is optimized for the intended purpose and consists of several numerical and alphanumerical LED segment displays. For user inputs six keys are available. For audible warnings the operator unit is equipped with a buzzer. The communication between operator unit and sensor is established as a bi-directional exchange of proprietary and standard NMEA telegrams via the Com-NMEA interface. The system can be calibrated from the operator unit. Optionally, Windows software for calibration via a laptop is available. The operator unit is normally console mounting. The dimension is international standard of 144 x 144 mm. A ruggedised housing for desktop mounting is also available. Operator unit power supply is 24 V DC. Power consumption is approximately 10 Watts.