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Kongsberg MRU-E-JB3
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Mitsubishi MR-S11-200-Z37
Mitsubishi MR-S11-200-Z37
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Siemens MSI-20B 500-893081
Siemens MSI-20B 500-893081

Kongsberg MRU-E-JB3

Product Name:​ Kongsberg MRU-E (5th Gen) Motion Reference Unit with JB3 Terminal Interface
Product Overview:​ A high-precision inertial sensor measuring roll, pitch, and heave motions, optimized for marine and offshore applications including DP, survey, and helideck monitoring.
Category:
Description
Technical Specifications:​
  • Roll/Pitch Accuracy:​ Static RMS 0.03°, Dynamic 1σ 0.010°
  • Heave Accuracy:​ Real-time RMS 5 cm or 5% (whichever larger); Delayed (PFreeHeave) RMS 1 cm or 1%
  • Heave Period Range:​ Real-time up to 25 s, delayed up to 50 s
  • Data Output Rate:​ Up to 200 Hz
  • Interfaces:​ RS-232, RS-422, Ethernet (10/100 Mbit), analog I/O via JB3 terminal strip (0–10 V / 4–20 mA)
  • Supply:​ 100–240 V AC input to JB3 box, regulated 24 V DC to sensor head
  • Temperature:​ -25°C to +70°C operating
  • Enclosure:​ Aluminum, IP66 (sensor and junction box)
  • Dimensions/Weight:​ ~226 × 126 × 90 mm, ~2.0 kg
    Functional Features:​
  • PFreeHeave Algorithm:​ Delivers phase-corrected heave without external aiding, suitable for long swells.
  • Lever-Arm Compensation:​ Configurable for two independent reference points (e.g., antenna vs. sonar).
  • Orientation Insensitive:​ No strict mounting attitude required; software-compensated.
  • Helideck Compliance:​ Meets HCA (Helideck Certification Agency) MSI calculation needs.
    Application Scenarios:​ Dynamic positioning (DP) systems, multibeam echosounder motion correction, crane heave compensation, offshore wind O&M vessels, naval gun stabilization.
    Material & Structure:​ Anodized aluminum housing with M6 mounting points; internal MEMS accelerometers, gyros, Kalman-filter DSP; JB3 interface box with screw terminals and glands (9–21 mm clamping).
    Working Principle:​ Triaxial accelerometers and rate gyros fused via Kalman filtering estimate attitude; vertical acceleration double-integrated with adaptive high-pass filtering and wave model to produce heave; external speed/heading can augment accuracy.
    Installation Requirements:​ Rigid mounting on vessel reference frame; avoid excessive vibration transmission paths; route serial/Ethernet separately from power; ground shield at one end.
    Precautions:​ Perform factory recalibration periodically (2-year recommended interval); ensure firmware supports required output sentences (NMEA 0183/2000, binary); verify lever-arm offsets in configuration software.
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