SBG Ekinox-A Marine MRU A2 - inertial measurement unit 8 g

The SBG Ekinox-A Marine 100-2122 is an MEMS MRU/AHRS with A2 accelerometers +/-8 g and gyroscopes +/-300 deg/s. It measures motion and provides roll, pitch and heave, without internal GNSS receiver.

Integration

Ethernet 10/100, RS-232/RS-422 link, web interface and 8 GB logger. Standard output reaches 200 Hz. Power input 9 to 36 V DC, power consumption under 3 W. Housing 100 x 86 x 58 mm, 400 g, IP68. Allow space for connectors.

Accuracy and limits

The A2 datasheet and manual typically list 7 µg/√Hz accelerometer noise and 2 µg bias stability. These raw sensor figures do not guarantee the final accuracy of each measurement. SBG’s web page shows different bias figures: the ordered configuration must be confirmed before final technical selection. Absolute heading requires an appropriate external reference; aided navigation accuracies are not guaranteed without assistance.

Contents and accessories

Unit only, sold on quotation. Main cable, power cable and commissioning accessories are offered separately. Protect bare cable terminations and verify the vibration profile and marine constraints of each installation location.

Vibration and usable bandwidth

Lower white noise does not ensure better measurement across every vibrating machine. For the A2, the manual lists a vibration rectification error VRE under 200 µg/g² over 20 Hz to 2 kHz. Published vibration qualification is 3 g RMS over this range. The actual vibration profile, rigid mounting and filtering must be validated; a standard 200 Hz output does not preserve a usable bandwidth of 433 Hz.

Manufacturer documentation

SBG Ekinox hardware manual, revision 1.4

Official Ekinox Series datasheet