Graviner MK6 Oil Mist Detector

Overview

Graviner MK6 Oil Mist Detector | Advanced Addressable Marine Crankcase Oil Mist Detection System

The Graviner MK6 Oil Mist Detector is an advanced marine engine safety system designed to continuously monitor oil mist concentration inside the crankcase of diesel engines. Developed as the successor to earlier Graviner systems, the MK6 introduced an analogue addressable architecture, individual detector heads, and the elimination of traditional sampling pipes, providing faster detection, simplified installation, and improved system reliability.

Designed for commercial marine applications, the MK6 continuously monitors each crankcase compartment and provides early warning of abnormal oil mist levels that may result from overheating bearings, lubrication failure, excessive friction, or other developing mechanical faults. Early detection enables engine room personnel to investigate potential problems before they lead to costly engine damage or crankcase explosions.

The Graviner MK6 Oil Mist Detector has been widely installed on commercial cargo vessels, tankers, offshore support vessels, passenger ships, and marine power generation engines, making it one of the most recognized oil mist detection systems in the marine industry.

At Ship Care Service, we supply genuine Graviner MK6 Oil Mist Detectors, detector heads, control units, spare parts, accessories, and technical support for marine operators worldwide.

What is the Graviner MK6 Oil Mist Detector?

The Graviner MK6 Oil Mist Detector is an engine-mounted oil mist monitoring system that uses individual detector heads installed directly on each crankcase compartment rather than relying on centralized sampling pipework.

Each detector continuously measures oil mist density using an optical light-scatter detection principle and transmits digital data to the central control unit. The control unit continuously evaluates every detector, compares measured values with programmed alarm thresholds, and immediately alerts engine personnel whenever abnormal conditions are detected.

This distributed monitoring approach provides faster detection, improved fault localization, and reduced maintenance compared with older sampling-pipe systems.

Why Oil Mist Detection is Essential

Marine diesel engines operate under high temperatures, heavy loads, and continuous service conditions. Even minor mechanical faults can generate excessive heat, causing lubricating oil to vaporize and form oil mist inside the crankcase.

Continuous oil mist monitoring helps operators:

• Detect abnormal engine conditions at an early stage

• Reduce the risk of crankcase explosions

• Protect bearings and rotating components

• Improve engine reliability

• Reduce unplanned downtime

• Support preventive maintenance programs

• Minimize costly engine repairs

By identifying developing faults early, maintenance can be scheduled before significant engine damage occurs.

How the Graviner MK6 Works

Unlike earlier Graviner models, the MK6 eliminates centralized sampling pipes and instead uses intelligent detector heads mounted directly on the engine.

Step 1 – Continuous Local Monitoring

Each detector head continuously monitors the oil mist concentration within its assigned crankcase compartment.

Step 2 – Optical Light Scatter Detection

The detector measures oil mist concentration using an optical light-scatter principle, providing high sensitivity while minimizing false alarms.

Step 3 – Digital Communication

Each detector converts its measurements into digital signals and transmits them to the central control unit through the system communication network.

Step 4 – Alarm Activation

If oil mist concentration exceeds the programmed alarm threshold, the control unit immediately activates visual and audible alarms while identifying the affected detector location, enabling engineers to respond quickly.

Key Features of the Graviner MK6 Oil Mist Detector

Addressable Detector Technology

Each detector head has its own address, allowing the control unit to identify the exact crankcase compartment where elevated oil mist has been detected.

No Sample Pipes Required

Unlike traditional oil mist detection systems, the MK6 eliminates sampling pipes, reducing installation complexity, maintenance requirements, and potential leakage points.

Fast System Response

The distributed detector architecture enables rapid monitoring of multiple cylinders, allowing early identification of abnormal engine conditions.

Optical Detection Technology

The MK6 uses optical light-scatter measurement to detect extremely low oil mist concentrations while maintaining excellent resistance to false alarms.

Modular Design

Individual detector heads can be replaced independently, reducing maintenance time and simplifying servicing without replacing the complete monitoring system.

Reliable Marine Construction

The MK6 is engineered for long-term operation in demanding marine engine room environments, including:

• High ambient temperatures

• Continuous vibration

• High humidity

• Heavy engine loads

• Long operating hours

Typical Applications

The Graviner MK6 Oil Mist Detector is suitable for a wide range of marine diesel engine installations.

Typical applications include:

Commercial Cargo Ships

Continuous crankcase monitoring for propulsion and auxiliary engines.

Oil & Chemical Tankers

Reliable engine protection during demanding cargo operations.

Container Ships

Supports safe and uninterrupted engine operation during long voyages.

Bulk Carriers

Provides early warning of developing crankcase faults.

Offshore Support Vessels

Reliable oil mist monitoring in offshore operating environments.

Passenger Ships

Continuous engine protection for propulsion and auxiliary power systems.

Marine Power Generation

Suitable for onboard diesel generator engines and stationary marine power applications.

Shipyards

Installed during new vessel construction, engine upgrades, and retrofit projects.

Industries We Serve

The Graviner MK6 Oil Mist Detector is widely used across:

• Marine Shipping

• Offshore Oil & Gas

• Ship Management

• Marine Engineering

• Ship Repair Yards

• Marine Power Generation

• Industrial Diesel Engine Applications

• Port Operations

Who Uses the Graviner MK6?

Typical users include:

• Chief Engineers

• Second Engineers

• Engine Superintendents

• Marine Engineers

• Technical Managers

• Ship Management Companies

• Shipyards

• Marine Service Engineers

• Offshore Maintenance Teams

Why Choose the Graviner MK6 Oil Mist Detector?

The Graviner MK6 is trusted by marine operators because it offers:

• Intelligent addressable monitoring

• Individual detector heads

• Optical light-scatter sensing

• No sampling pipework

• Fast fault identification

• Reliable alarm performance

• Modular maintenance

• Proven marine reliability

Its modern detector architecture and proven operational performance make the MK6 an excellent solution for protecting marine diesel engines against developing crankcase faults while reducing maintenance complexity.

Technical Overview

The Graviner MK6 Oil Mist Detector is an intelligent addressable crankcase oil mist monitoring system designed to provide continuous protection for marine diesel engines. Unlike conventional sampling-type oil mist detectors, the MK6 utilizes individual optical detector heads installed directly on each crankcase compartment. Each detector continuously measures oil mist concentration and communicates with the central control unit for real-time monitoring.

The distributed detector architecture improves fault identification, minimizes maintenance requirements, and enhances overall system reliability by eliminating long sampling pipes and mechanical sampling components.

Note: Technical specifications may vary depending on engine configuration, number of detector heads, and equipment version. Always verify installation details using the equipment nameplate and manufacturer's documentation.

Main Components of the Graviner MK6 Oil Mist Detector

The MK6 consists of several integrated components that provide reliable engine monitoring.

Central Control Unit

The control unit serves as the primary monitoring and processing system.

Its functions include:

• Continuous detector monitoring

• Alarm processing

• Detector communication management

• System diagnostics

• Event indication

• Operating status display

The controller continuously receives information from every connected detector head.

Addressable Detector Heads

Each crankcase compartment is fitted with an individual detector head.

Each detector performs:

• Continuous oil mist monitoring

• Optical measurement

• Digital signal processing

• Communication with the controller

Because each detector has its own electronic address, the control unit can immediately identify the affected crankcase compartment whenever an alarm occurs.

Optical Sensor Assembly

Each detector contains an optical sensing system that measures oil mist concentration using the light scatter principle.

This technology provides:

• Stable measurements

• Fast response

• High sensitivity

• Reliable long-term operation

Communication Network

Detector heads communicate digitally with the central control unit through dedicated communication wiring.

The communication system allows:

• Continuous detector supervision

• Detector fault monitoring

• Alarm transmission

• Detector identification

Alarm System

When abnormal oil mist concentration is detected, the system activates:

• Audible Alarm

• Visual Alarm

• Alarm Output Signal

Depending on the vessel's automation system, alarm signals may also be transmitted to:

• Engine Monitoring System

• Alarm Monitoring System (AMS)

• Engine Protection System

Working Principle

The Graviner MK6 continuously monitors crankcase conditions whenever the engine is operating.

Step 1 – Continuous Local Detection

Each detector head continuously monitors oil mist concentration within its assigned crankcase compartment.

Step 2 – Optical Measurement

The detector measures oil mist using an optical light scatter method.

As oil mist concentration increases, the amount of scattered light changes, allowing the detector to calculate oil mist density accurately.

Step 3 – Digital Communication

Measurement data is transmitted continuously from each detector head to the central controller.

The controller evaluates every detector independently while supervising overall system performance.

Step 4 – Alarm Activation

If oil mist concentration exceeds the programmed alarm threshold, the controller immediately:

• Identifies the affected detector

• Activates visual alarms

• Sounds audible alarms

• Sends alarm outputs to connected monitoring systems (where installed)

Advantages of the Graviner MK6

Individual Detector Monitoring

Every crankcase compartment is monitored independently, allowing rapid identification of developing faults.

No Sampling Pipework

The elimination of sampling pipes provides several advantages:

• Reduced maintenance

• Simplified installation

• Fewer leakage points

• Improved long-term reliability

Continuous Engine Protection

The detector provides uninterrupted crankcase monitoring throughout engine operation.

Fast Fault Identification

Addressable detector technology enables engineers to immediately identify the crankcase compartment where abnormal oil mist has been detected.

Reliable Marine Construction

The MK6 is designed for reliable operation in demanding engine room environments, including:

• High temperatures

• Continuous vibration

• Humidity

• Heavy engine loading

• Long operating hours

Modular Maintenance

Individual detector heads can generally be serviced or replaced independently, minimizing maintenance time and reducing operational interruptions.

Routine Maintenance

Regular inspection helps maintain reliable system performance.

Before Engine Operation

Inspect:

• Control unit status

• Detector communication

• Alarm indicators

• Power supply

• System diagnostics

Confirm that the detector indicates normal operation before engine start.

Weekly Inspection

Check:

• Detector head condition

• Display operation

• Alarm indicators

• Electrical connections

• Visible contamination

Inspect for physical damage or excessive dirt accumulation.

Monthly Inspection

Inspect:

• Detector communication

• Optical sensor condition

• Wiring connections

• Alarm outputs

• Controller diagnostics

Clean detector surfaces if contamination is observed.

Annual Maintenance

Recommended annual maintenance includes:

• Complete functional inspection

• Detector performance verification

• Optical sensor inspection

• Electrical inspection

• Alarm testing

• Communication verification

• Calibration verification (if applicable)

Maintenance activities should be documented within the vessel's Planned Maintenance System (PMS).

Common Operational Problems

Although the Graviner MK6 is designed for dependable operation, some issues may occur during long-term service.

Problem: False Alarm

Possible Causes

• Detector contamination

• Moisture accumulation

• Electrical interference

• Damaged detector head

Recommended Solution

Inspect and clean the detector head, verify wiring connections, and confirm proper installation.

Problem: Detector Communication Failure

Possible Causes

• Loose communication cable

• Wiring damage

• Detector malfunction

• Controller communication fault

Recommended Solution

Inspect communication wiring, verify detector connections, and replace defective components if required.

Problem: Display Not Operating

Possible Causes

• Power supply interruption

• Blown fuse

• Controller fault

• Loose electrical connection

Recommended Solution

Verify input power, inspect wiring, and check protective devices before further troubleshooting.

Problem: Alarm Does Not Activate

Possible Causes

• Alarm circuit fault

• Detector communication problem

• Controller malfunction

Recommended Solution

Verify alarm outputs, inspect communication status, and perform functional testing according to maintenance procedures.

Problem: Frequent Fault Indications

Possible Causes

• Contaminated detector

• Electrical noise

• Aging detector components

• Wiring issues

Recommended Solution

Inspect the complete system, clean detectors where appropriate, and replace damaged components if necessary.

Calibration Recommendations

To maintain reliable detection performance, periodic functional testing and calibration verification should be performed according to the manufacturer's recommendations and the vessel's maintenance procedures.

Calibration is recommended:

• During scheduled maintenance

• After replacing detector heads

• Following major engine repairs

• After prolonged equipment shutdown

• As specified in the vessel's Planned Maintenance System (PMS)

Genuine Spare Parts Available

Ship Care Service supplies genuine replacement parts for the Graviner MK6 Oil Mist Detector, including:

• Addressable Detector Heads

• Optical Sensor Assemblies

• Central Control Unit Components

• Communication Modules

• Wiring Harnesses

• Alarm Modules

• Display Components

• Power Supply Components

• Connectors

• Mounting Hardware

• Replacement Accessories

Availability depends on the equipment version and production series.

Buying Guide

Before purchasing a Graviner MK6 Oil Mist Detector or replacement components, consider the following:

Verify Engine Compatibility

Confirm that the detector is compatible with your engine model and existing monitoring system.

Confirm Equipment Details

Providing the equipment model, serial number, and detector configuration helps identify the correct replacement unit or spare parts.

Choose Genuine Components

Using genuine replacement parts helps maintain:

• Reliable monitoring

• System compatibility

• Long service life

• Safe engine operation

Work with an Experienced Supplier

Select a supplier capable of providing technical support, genuine products, and after-sales assistance for marine engine safety systems.

Why Marine Operators Choose the Graviner MK6

The Graviner MK6 remains a preferred crankcase monitoring solution because it provides:

• Addressable detector technology

• Optical light scatter detection

• Continuous engine monitoring

• Fast fault localization

• Modular maintenance

• Reliable digital communication

• Durable marine construction

• Long operational service life