INTRODUCTION

The Graviner MK7 Oil Mist Detector (OMD) is the latest generation crankcase oil mist monitoring and protection system developed by Kidde Graviner for marine diesel engines. The system continuously monitors oil mist concentrations inside engine crankcases and provides early warning of abnormal operating conditions that may lead to severe engine damage or crankcase explosions. The MK7 was developed as a next-generation solution featuring digital communication, advanced diagnostics, touch-screen operation, and simplified installation compared with earlier OMD generations.

The images provided show a complete Graviner MK7 system consisting of:

• Remote Display Unit (RDU)
• Engine Mounted Control Unit
• Detector Heads
• Junction Box
• Communication Cables
• Detector Interfaces

The MK7 system is designed for both two-stroke and four-stroke marine diesel engines and is widely installed on commercial vessels, offshore platforms, power generation plants, and industrial engine installations.

Oil mist detection is one of the most important safety functions on large diesel engines. Early detection of oil mist caused by overheating bearings, piston damage, crankshaft defects, or lubrication failures allows engineers to take corrective action before catastrophic engine damage occurs.

PRODUCT OVERVIEW

The Graviner MK7 is an intelligent auto-addressed oil mist detection system that continuously measures oil mist density within individual crankcase compartments.

Unlike older oil mist detector systems that required centralized sampling pipes, the MK7 uses individual detector heads mounted directly on crankcase locations. Each detector independently measures oil mist concentration and communicates digitally with the engine-mounted control unit. This design significantly reduces installation complexity and maintenance requirements.

The system architecture includes:

• Detector Heads mounted on crankcase doors
• Engine Mounted Control Unit
• Remote Display Unit
• Communication Network
• Alarm Outputs
• Shutdown Interfaces
• Maintenance and Diagnostic Functions

The Remote Display Unit shown in the image uses a color touch-screen interface that allows engineers to monitor oil mist levels, detector status, alarms, historical events, and diagnostic information without entering machinery spaces during alarm conditions.

A complete MK7 installation can monitor up to 100 detector heads across up to 10 engines, making it suitable for vessels with multiple propulsion and auxiliary engines.

KEY FEATURES

Auto-Addressed Detector Technology

Each detector is automatically identified by the control system, simplifying installation, commissioning, and maintenance procedures.

Direct Crankcase Monitoring

Detector heads are mounted directly on crankcase compartments, eliminating traditional sample pipe systems and reducing maintenance costs.

Multi-Engine Capability

The MK7 system can support up to 10 detector heads per control unit and up to 10 control units per integrated system, enabling monitoring of large engine installations.

Touch Screen User Interface

The Remote Display Unit provides a modern touch-screen interface for system monitoring, diagnostics, and maintenance activities.

Optical Oil Mist Detection

The system uses advanced optical measurement techniques to determine oil mist density and provide highly reliable early warning of developing engine faults.

Rapid Alarm Response

The MK7 continuously monitors detector outputs and immediately activates alarms when oil mist concentrations exceed preset limits.

Advanced Diagnostics

Built-in diagnostics simplify fault finding, maintenance planning, and system health monitoring.

TECHNICAL SPECIFICATIONS

Technical data based on manufacturer literature and MK7 documentation.

APPLICATIONS

The Graviner MK7 OMD is installed onboard:

Container Ships

Protection of main propulsion engines and auxiliary generators.

Bulk Carriers

Continuous monitoring of crankcase conditions and early fault detection.

Oil Tankers

Protection against crankcase explosions and bearing failures.

Chemical Tankers

Reliable monitoring of propulsion and power generation engines.

LNG Carriers

Continuous crankcase protection for critical propulsion systems.

LPG Carriers

Engine safety monitoring and machinery protection.

Offshore Vessels

Protection of propulsion engines, generators, and dynamic positioning power plants.

Passenger Ships

Continuous monitoring of propulsion and auxiliary engine systems.

Research Vessels

Protection of mission-critical power generation and propulsion equipment.

Fishing Vessels

Monitoring of main engines and auxiliary generators.

The MK7 integrates with:

• Engine Monitoring Systems
• Alarm Monitoring Systems
• Integrated Automation Systems
• Power Management Systems
• Shutdown Systems
• Main Engine Safety Systems
• Vessel Machinery Control Systems

SPARE PARTS SUPPORT

SM MARINE SERVICE™ supports sourcing and supply of:

• MK7 Detector Heads
• MK7 Control Units
• MK7 Remote Display Units
• MK7 Junction Boxes
• MK7 Communication Modules
• MK7 Power Supply Units
• MK7 Fan Assemblies
• MK7 O-Rings and Seals
• MK7 Smoke Test Kits
• MK7 Detector Cables
• MK7 Service Kits
• Complete MK7 Systems

A wide range of MK7 spare parts and maintenance kits are available for routine service and emergency replacement requirements.

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REPAIR AND TECHNICAL SERVICES

SM MARINE SERVICE™ provides complete technical support for Graviner MK7 Oil Mist Detector systems.

Troubleshooting

Diagnosis of:

• Detector Fault Alarms
• Communication Failures
• Display Unit Problems
• Detector Addressing Errors
• Junction Box Faults
• Fan Failures
• Alarm Output Issues
• Power Supply Problems

Repair

Professional repair services for remote displays, control units, detector heads, communication modules, and electronic assemblies.

Calibration

Verification and adjustment of detector performance and alarm settings.

Testing

Functional testing using approved smoke test equipment and diagnostic procedures.

Overhaul

Complete refurbishment, cleaning, component replacement, and operational verification.

Technical Documentation Support

Support may be available for:

• User Manual
• Service Manual
• Installation Manual
• Wiring Diagram
• Maintenance Procedures
• Spare Parts Documentation
• Commissioning Instructions

Workshop and Onboard Service

Our engineers provide workshop repairs and onboard attendance worldwide for troubleshooting, calibration, annual maintenance, and commissioning.

WHY CHOOSE SM MARINE SERVICE™

SM MARINE SERVICE™

Bangladesh Office
Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh

China Warehouse and Support Center
Shanghai, China

SM MARINE SERVICE™ supplies both New Equipment and Reconditioned Equipment depending on customer requirements and budget.

We provide worldwide supply, sourcing, repair, calibration, technical support and spare parts services for marine automation, navigation, communication and marine electronic systems.

Website : https://www.smmarineservice.com

Email : info@smmarineservice.com

WhatsApp and Viber : +8801818929292

Marketing Contact: Nazmul Hasan Bhuiyan

Mobile WhatsApp and Viber : +8801730296909

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CONCLUSION

The Graviner MK7 Oil Mist Detector represents the latest generation of crankcase protection technology for marine diesel engines. Its advanced digital architecture, touch-screen operation, auto-addressed detectors, and high-capacity monitoring capability make it one of the most reliable oil mist detection systems available for modern vessels. The system provides early warning of developing engine faults and helps prevent costly engine damage and dangerous crankcase explosions.

For Graviner MK7 Oil Mist Detector supply, repair, calibration, troubleshooting, spare parts, technical documentation support, reconditioned equipment, onboard attendance, and worldwide marine services, contact SM MARINE SERVICE™. Our experienced marine automation specialists support shipowners, ship managers, chief engineers, and vessel operators worldwide with professional oil mist detection solutions.

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