Description
1. Unboxing & Physical Snapshot
- Model & Brand: Kongsberg Seatex / Motion Reference Unit Series (Part No. MRU-5 / MRU-5-1)
- Physical Dimensions (Approximate W x H x D): Cylindrical housing form factor, approximately 105.0 mm diameter x 140.0 mm height (\varnothing 105 \times 140 mm).
- Estimated Shipping Weight: 2.20 kg (4.85 lbs).
- What’s in the Box: Solid-state motion reference sensor unit, integrated bottom connector interface, mounting bracket hardware kit, factory calibration certificate, and original manufacturer compliance documentation.
2. Product Introduction
Offshore hydrographic surveying, multi-beam echo sounding, dynamic positioning (DP) operations, and offshore crane stabilization demand ultra-high-precision orientation and inertial tracking data. This Kongsberg Seatex MRU-5 motion reference unit mounts securely to vessel superstructures or subsea vehicle frames—which is vital for measuring real-time roll, pitch, yaw, and linear accelerations with minimal latency.
The ruggedized anodized aluminum housing protects internal solid-state angular rate gyros and linear accelerometers from severe marine salt-spray and moisture exposure. Translating dynamic vessel motion into high-rate digital output packets, this hardware maintains absolute measurement fidelity under harsh open-ocean operating cycles.
3. Core Technical Specifications
| Parameter | Value |
| Device Type | High-Precision Marine Motion Reference Unit (MRU) |
| Roll & Pitch Accuracy | 0.02° RMS (for a \pm 5^\circ amplitude) |
| Angular Orientation Range | \pm 180^\circ continuous across all axes |
| Acceleration Range | \pm 30 \, m/s^2 across all linear axes |
| Heave Measurement Performance | Real-time 5 cm or 5% (whichever is highest); delayed PFreeHeave down to 2 cm |
| Output Data Rate | Up to 200 Hz via Ethernet UDP/IP and serial lines |
| Operating Temperature Range | -5 °C to +55 °C (+23 °F to +131 °F operational limits) |
| Enclosure Protection Class | IP66 marine-grade anodized aluminum housing |
| Power Supply Requirements | 10 to 36 V DC (Nominal 7.2 W consumption) |
4. Global Compliance & Industry Certifications
- Expected Regulatory Approvals: CE Mark, IEC 60945 / EN 60945 Maritime Navigation and Radio Communication Equipment (Immunity/Emission standards), IHO Special Order compliance, and RoHS directives.
- Safety & Compliance Impact: Compliance with strict IEC 60945 EMC standards ensures that high-frequency internal processing components do not generate electromagnetic interference that could disrupt sensitive onboard navigation or radio tracking systems.
- Verify specific lot certifications with OEM.
5. Long-Term Storage & Asset Preservation Guide
Keep this motion sensor sealed inside its original anti-static and moisture-barrier packaging to protect internal solid-state circuitry from electrostatic discharge events. Maintain warehouse storage conditions within a temperature range of -25 °C to +70 °C and a relative humidity level strictly below 60% to prevent micro-oxidation on the bottom electrical connector pins. Store the unit upright on stable shelving racks, avoiding heavy stacking loads that could compromise structural housing integrity.
6. Physical Installation Prerequisites
- Verify that the mounting foundation is rigid, flat, and mechanically isolated from excessive structural vibration to prevent measurement artifacts.
- Align the sensor orientation axes accurately with the vessel’s longitudinal and transverse centerlines, noting alignment offsets for configuration software entry.
- Secure all inter-connecting cabling cleanly, ensuring strain relief is applied to prevent water migration along connector assemblies in exposed marine environments.
7. Buyer’s FAQ (Logistics & Compliance Focus)
- Q: What Harmonized System (HS) code applies for international customs clearance on this Kongsberg MRU unit?
- A: Navigational instruments, marine motion sensors, and electronic direction-finding apparatus typically classify under HS code 9014.20 or 9031.80. Confirm local code accuracy with your trade compliance broker.
- Q: Does this hardware ship with a factory calibration certificate?
- A: Yes. Every genuine Kongsberg MRU unit ships with an individual calibration certificate verifying dynamic accuracy performance parameters.
- Q: How does the Country of Origin (COO) documentation affect our import compliance audit?
- A: Manufacturing origin records correspond to authorized European production facilities within Kongsberg’s maritime division. Check commercial invoice documentation for precise country details to satisfy trade treaty requirements.
- Q: Is specialized transit insurance recommended during shipment?
- A: Yes. Because precision inertial navigation sensors contain sensitive internal solid-state gyros and micro-accelerometers, comprehensive transit insurance guarding against severe shock and drop impact is strongly advised.
