MRU 2

Horten, NO

Description

The MRU 2 is typically used for roll and pitch measurements in offshore riser monitoring systems, dynamic positioning systems, telecommunication antenna compensation systems and motion damping systems on high speed crafts. The MRU 2 incorporates two highly accurate accelerometers and two Micro-Electro-Mechanical-Structures (MEMS) angular rate gyros. This unit achieves high reliability by using solid state sensors with no rotational or mechanical wear-out parts

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Specifications

General: Height [m]

0.14

Material

Anodised aluminium

Environmental: Max. operating temperature [°C]

55

Splashproof casting

Y

Water resistant casting

N

Vibration and operating shock tolerance

IEC 60945/EN 60945

Electromagnetic compatibility

IEC 60945/EN 60945

Mounting orientation

In a fixed direction relative to the ship

Min. operating temperature [°C]

-5

Power: Min. Voltage (DC)

10

Max. Voltage (DC)

36

Power consumption [W]

4.9

Roll and Pitch Output: Roll and pitch measurement

Y

Angle accuracy static in ° [RMS]

0.08

Angle accuracy dynamic in ° [RMS]

0.1

Resolution angle [°]

0.001

Angular rate range [°/s]

100

Interfaces and Data: Ethernet port

Y

RS232 output

Y

RS422 output

Y

Other output ports

Bidirectional RS-422 from junction box, user configurable RS-232, RS-422

Data output rate

200 Hz, Ethernet UDP/IP 10/100 Mbps

Data output protocols/formats

The MRU 2 outputs static and dynamic roll and pitch angles and corresponding angular rate vectors. The unit outputs surge and sway accelerations. The status of the MRU 2 is available online. For this fifth generation MRU data is available through an Ethernet interface and serial lines enable easy distribution of MRU data to multiple users on board the vessel. Output data are available on two individually configurable serial lines and Ethernet/UDP.Output variables are transmitted as IEEE 32-bit floats(recommended) or as scaled integers. In addition, ASCII-based NMEA 0183 proprietary sentences can be selected as data output protocols.

Acceleration Output: Acceleration measurement

Y

Acceleration range m/s2

30

Acceleration noise m/s2 RMS

0.002

Acceleration accuracy m/s2 RMS

0.01