Description
Product Overview
MRU-E-JB1 is a Motion Reference Unit (MRU) manufactured by Kongsberg Seatex. It consists of the MRU-E inertial sensor unit matched with JB1 junction box. The device adopts high-performance MEMS gyroscope and accelerometer to measure vessel motion parameters including roll, pitch, heave, angular velocity and linear acceleration. It delivers high-speed motion data to dynamic positioning systems, motion compensation equipment and marine monitoring control systems.
It is widely used for offshore platforms, DP vessels, survey ships and marine energy projects.
Technical Specifications
| Item | Parameter |
|---|---|
| Part Number | MRU-E-JB1 |
| Module Type | Motion Reference Unit with JB1 Junction Box |
| Manufacturer | Kongsberg Seatex |
| Core Sensor | Solid-state MEMS 3-axis gyro + 3-axis accelerometer |
| Attitude Accuracy | Roll/Pitch: ≤0.03° RMS |
| Heave Accuracy | 5 cm or 5% FS (whichever is greater) |
| Data Output Rate | Up to 200 Hz |
| Power Supply | 12–36 VDC, nominal 24 VDC |
| Communication Ports | Dual RS232/RS422 serial ports, 10/100 Mbps Ethernet |
| Supported Protocols | Kongsberg proprietary protocol, NMEA, ASCII |
| Protection Grade | Sensor unit IP65; junction box IP20 |
| Operating Temperature | -25 ℃ ~ +70 ℃ |
| Ambient Humidity | 5%–95% non-condensing |
| Weight | Approx. 1.98 kg complete assembly |
| Certification | IMO DP compliant, marine classification society approved |
| Spare Part Status | OEM production discontinued; new surplus and refurbished assemblies available |
MRU-E-JB1
Key Features
- Six-degree-of-freedom motion measurement for real-time vessel attitude and heave tracking
- JB1 junction box integrates power distribution, signal terminal and interface conversion circuits
- Robust marine-grade aluminum housing, anti-vibration and corrosion resistant for offshore environments
- Built-in sensor self-diagnosis to detect internal hardware faults and signal anomalies
- Supports lever-arm compensation for flexible installation position calibration
Important note: MRU-E-JB1 is the 4th generation configuration; the updated version uses JB3 junction box. Direct interchange without configuration verification is not recommended.
- High data update rate meets strict real-time requirements of dynamic positioning and motion compensation systems
Application Scope
Offshore platform dynamic positioning control systems, marine survey vessel motion monitoring, wind farm service vessel automation, ocean engineering motion compensation equipment, marine seismic exploration navigation systems, and maintenance & retrofit projects of legacy Kongsberg MRU marine inertial measurement systems.
