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Kongsberg Seatex MRU 5 Marine Motion Sensor

Available for rental/hire from Ashtead Technology - the Kongsberg Seatex MRU 5 Marine Motion Sensor.

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This fifth generation MRU 5 is specially designed for high precision motion measurements in marine application and for users requiring high accuracy roll, pitch and heave measurements.

The MRU 5 is the ideal sensor for motion compensation of multi-beam echo sounders, offshore cranes, hydroacoustic positioning systems and dynamic motion monitoring of roll, pitch and linear accelerations on offshore structures. The MRU 5 provides documented roll and pitch accuracy of 0.02° RMS at a ±5° amplitude. The unit maintains its specified accuracy aboard any surface vessel or subsea vehicle.

The MRU 5 incorporates three highly accurate accelerometers and three high-end Kongsberg Seatex developed Micro- Electro-Mechanical-Structures (MEMS) gyros of type MRG (MRU Rate Gyro). The MRG gyro combines low noise, excellent bias stability and gain accuracy. Very high reliability is achieved 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.

  • 0.02° roll and pitch accuracy
  • 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
  • Active heave compensation
  • Motion compensation of echo sounder
  • Vessel motion monitor
  • Helideck monitoring system
  • Dynamic positioning
  • Motion damping systems on high speed crafts
  • Stabilisation applications
  • Hydro acoustic positioning