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MRU E

Motion Reference Unit

MRU E is the fifth generation roll, pitch, and heave motion sensor with an extended temperature range, making it ideal for marine applications. It is designed to function in ambient temperatures ranging from -25 to +70°C. Suitable for installation in various locations such as open decks, cabinets, or bulkheads, MRU E is an essential component for systems that require accurate motion measurements.

Optimized for Helideck Monitoring Systems

The MRU can be strategically positioned directly beneath the helideck center to measure 3-axes linear accelerations along with roll, pitch, and heave, crucial for Helideck Monitoring Systems. It serves to inform about the helideck location when it is apart from accommodation and the hull areas. Complying with HCA requirements, the MRU E measures helideck acceleration to calculate the Motion Severity Index (MSI), an important safety metric in marine operations.

Specialized Algorithms for Enhanced Performance

The MRU E utilizes the PFreeHeave algorithm to deliver a precise and phase-free heave measurement based on past data. This functionality is particularly beneficial in long swell conditions, and is essential for applications such as seabed mapping that can accommodate a slight delay in the heave signal. To ensure the greatest accuracy in heave, roll, and pitch, especially during turns and accelerations, the sensor accepts external inputs, including separate speed and heading information via serial lines or Ethernet.

Key features

  • 0.05° roll and pitch accuracy
  • Outputs real-time heave, roll, pitch and linear acceleration measurements
  • Outputs on RS-232, RS-422 and Ethernet
  • High output data rate (200 Hz)
  • Each MRU delivered with Calibration Certificate
  • No limitation in mounting orientation
  • Lever arm compensation to two individually configurable monitoring points
  • Meets HCA requirements
  • Small size, light weight and low power consumption
  • Selectable communication protocols in the Windows based MRU configuration software
  • 2-year warranty

Product range

    Technical specifications

    Output

    Roll/pitch Static RMS:
    0.03°
    Roll/pitch Dynamic 1-sigma:
    0.010°
    Heave Real-time RMS:
    5 cm/5 %
    Heave Period Real-time:
    25 s
    Heave Delayed RMS:
    1 cm/1 %
    Heave Period Delayed:
    50 s

    Downloads

    Data sheet

    Release notes

    Misc. information

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