MRUs - Motion Reference Units

MRU 3000 Subsea

Market leading performance at an affordable price

The Norwegian Subsea MRU 3000 Subsea is ideal for any application that requires accurate and robust subsea motion measurements. The Subsea Motion Reference Unit is a very small and compact motion sensor that is depth rated to 6000m. The small size and footprint make it easy to install almost anywhere. The Subsea MRU comes in three versions with different accuracies: 3000, 6000 and 9000 models. The specifications are for the 3000 model.

Norwegian Subsea

Oslo, NO

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Description

High-Performance Performance Motion Reference Units

NORSUB MRUs are high-performance, compact, and affordable 6 DOF motion sensors. They use state-of-the-art MEMS technology and advanced sensor fusion algorithms, resulting in accurate and reliable roll, pitch, yaw, surge, sway, heave position and velocity measurements. Performance is high also during horizontal accelerations and in irregular coupled motions.

Tailor-Made For Subsea Use

The MRU Subsea is ideal for use in subsea applications such as riser motion monitoring, ROV/AUV or subsea surveys. The MRU Subsea is a very compact motion sensor that is depth rated to 6000m. The small size and footprint make it easy to install almost anywhere. The high performance in irregular motions makes it ideal for use in real sea conditions.

Easy Interfacing

The MRU Subsea comes in a waterproof titanium housing with ethernet and serial ports for easy communication with your system. Communication options include Ethernet, RS-232 and RS-485/422. A Subconn connector is used for both power and communication. Industrial communication protocols can be used for PLC interfacing. The MRU comes with a wide range of standard and customized ASCII or binary data protocols. The MRU can be delivered with custom length cables and SubConn 8 pin connectors.

An MRU for Your Needs

The MRU Subsea comes in three versions (3000, 6000, 9000) to accommodate for different performance requirements and budgets. A high-end magnetometer can be included to provide accurate magnetic heading measurements. The internal health monitoring system ensures high-performance operability and fault detection. DP and gangway use modes are available.

User-Friendly Configuration Software

The free Windows-based NORSUB MRU Configuration Software is used to set-up the MRU. Here you can configure the communication ports, customize the output data protocol, configure the MRU installation parameters, set up remote monitoring points, calibrate the magnetometer. The software can also update the MRU firmware, log the MRU data to file, and plot output data.

Every Unit is Tested and Validated

Every MRU is delivered with a Configuration, Calibration, and Validation Certificate. Every unit is calibrated and validated independently through a systematic sequence of rigorous tests in our labs simulating both regular and irregular sea motions. The calibration certificate is valid for four years and full product specifications are mantained in this period under normal operating conditions.

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Specifications

General: Height [m]

0.165

Material

Titanium

Weight in water [kg]

0.9

Environmental: Max. operating temperature [°C]

70

Water resistant casting

Y

Water resistance [m]

7000

Vibration and operating shock tolerance

2000 m/s2

Min. operating temperature [°C]

-20

Power: Min. Voltage (DC)

9

Max. Voltage (DC)

36

Power consumption [W]

6

Roll and Pitch Output: Roll and pitch measurement

Y

Angle accuracy static in ° [RMS]

0.05

Angle accuracy dynamic in ° [RMS]

0.05

Angular roll/pitch range [°]

180

Max. rotation speed [deg/s]

180