Kongsberg Seatex MRU H Marine Motion Sensor

  • High accuracy heave measurements even in dynamic environments
  • Outputs on RS-232, RS-422 and ethernet
  • High output data rate (200 Hz)
  • Precise heave at long wave periods by use of PFreeHeave algorithms
  • Lever arm compensation to two individually configurable monitoring points
  • Meets IHO special order requirements
  • Small size, light weight and low power consumption
  • No limitation to mounting orientation
  • Each MRU delivered with calibration certificate
  • Selectable communication protocols in the Windows based MRU configuration software




This fifth generation MRU is specially designed for heave compensation applications.
The MRU H is specially designed for motion measurements in marine applications requiring highly accurate heave measurements in environments with extreme horizontal accelerations. This MRU is an ideal sensor for roll, pitch and heave compensation of offshore cranes and echo sounders. The MRU H can also be used for typical ship motion monitoring applications such as helideck motion monitoring, hydroacoustic positioning systems, as well as hull stress monitoring.

The MRU H incorporates three highly accurate accelerometers and three Micro-Electro-Mechanical-Structures (MEMS) angular rate gyros. This unit achieves high reliability by using solid state sensors with no rotational or mechanical wear-out parts.

The unit is delivered with Windows based configuration and data presentation software. In this software vector arms from where the MRU is mounted to center of gravity (CG) and two individually configurable monitoring points (MPs), can be defined. The heave measurements can be output in four different locations (the MRU itself, CG, MP1 and MP2) simultaneously on serial lines or Ethernet port. Typical monitoring point is the transducer head or the crane tip.