Kongsberg MRU-5 Marine Motion Sensor | In Stock -40°C to +85°C Operating Range

Description

Product Introduction

Deploying a reliable motion reference unit is often the make-or-break factor in offshore drilling or heavy-lift operations where a fraction of a degree determines safety. The Kongsberg MRU-5 is a high-precision marine sensor designed to deliver real-time kinematic data, ensuring vessels and cranes can maintain stability even in rough seas. It serves as the “inner ear” for dynamic positioning (DP) systems on ships and rigs.The engineering behind the MRU-5 focuses on ironclad stability. It utilizes advanced fiber-optic gyro (FOG) technology to achieve an accuracy of 0.001° for roll and pitch measurements. This level of precision is critical for maintaining station-keeping during subsea construction. Even in the harshest environments, the unit operates reliably within a temperature range of -40°C to +85°C, making it a robust solution for polar or equatorial deployments.

Key Technical Specifications

• Measurement Type: Roll, Pitch, Heave, Heading, Surge, Sway
• Roll/Pitch Accuracy: 0.001° RMS
• Heave Accuracy: 2.5 cm + 0.05% of motion amplitude
• Operating Temperature: -40°C to +85°C
• Storage Temperature: -55°C to +100°C
• Vibration Resistance: 10 g RMS (5 Hz to 500 Hz)
• Shock Resistance: 30 g (11 ms half-sine)
• Output Data Rate: Up to 200 Hz
• Interfaces: Ethernet, RS-422, Fiber Optic
• Power Supply: 90–264 VAC or 18–36 VDC (Redundant)
• Certifications: DNV GL, ABS, BV, CCS, LR, RMRS (Marine Classification)

Application Scenarios & Pain Points

Scenario A: The Offshore Wind Installation Crisis
Imagine an offshore wind turbine installation vessel hovering over a foundation in the North Sea. The waves are rolling, and the crane operator needs millimeter precision to mate the tower section. Without a reliable MRU feeding accurate heave compensation data, the load swings unpredictably. In this high-stakes environment, the Kongsberg MRU-5 steps in. It filters out the chaotic noise of the waves, providing the crane’s control system with the exact vertical motion data needed to keep the load stable relative to the sea floor.Applications:

• Offshore Drilling Rigs: The MRU-5 is the backbone of the DP system, preventing the rig from drifting off the wellhead during critical drilling operations. Even a slight positional error here can mean millions in lost time.
• Heavy Lift Vessels: When transferring massive modules between barges, the crane must compensate for the ship’s roll. The MRU-5 provides the real-time pitch data that makes this “motion-compensated lift” possible.
• Subsea Construction: ROV launch and recovery systems (LARS) rely on the MRU-5 to keep the cage steady as it passes through the splash zone, protecting multi-million dollar underwater robots from damage.
• Hydrographic Survey Ships: For accurate seabed mapping using sonar, the vessel’s motion must be subtracted from the data. The MRU-5 ensures the bathymetric charts are precise, not skewed by the ship rocking in the swell.
• Floating Production Storage and Offloading (FPSO): During tanker loading operations, the MRU-5 monitors relative motion between the FPSO and the shuttle tanker to prevent hose ruptures or collisions.