Graviner MK7 Oil Mist Detector

Overview

Graviner MK7 Oil Mist Detector – Next-Generation Engine Protection for Marine Diesel Engines

The Graviner MK7 Oil Mist Detector is the latest generation of intelligent crankcase oil mist monitoring systems developed to protect marine diesel engines from the risks associated with abnormal oil mist formation. Designed for modern commercial vessels, the MK7 combines addressable optical detector heads, engine-mounted control units, and an optional touchscreen remote display to provide continuous real-time monitoring of engine crankcases with fast and accurate fault identification. The system is capable of monitoring up to 100 detector heads across multiple engines using distributed control units, making it suitable for both propulsion and auxiliary engine applications.

Unlike older sampling-type oil mist detectors, the Graviner MK7 eliminates external sampling pipes by using intelligent detector heads mounted directly on each crankcase compartment. Each detector continuously measures oil mist density using optical light-scatter technology, converts the measurement into digital data, and transmits it to the engine-mounted control unit for continuous analysis.

The MK7 is widely installed on commercial cargo vessels, tankers, offshore support vessels, passenger ships, and marine power generation systems where reliable crankcase monitoring is essential for engine safety and operational continuity.

At Ship Care Service, we supply genuine Graviner MK7 Oil Mist Detectors, detector heads, control units, remote display units, spare parts, accessories, and technical support for shipowners, ship management companies, offshore operators, and marine service providers.

What is the Graviner MK7 Oil Mist Detector?

The Graviner MK7 Oil Mist Detector is an intelligent auto-addressed oil mist detection system that continuously monitors oil mist concentration inside marine diesel engine crankcases.

Each detector head independently monitors a single crankcase compartment and communicates digitally with the engine-mounted control unit. The system continuously evaluates oil mist levels, supervises detector health, and immediately alerts engineers whenever abnormal oil mist concentrations are detected.

Its modular architecture allows multiple control units and detector heads to operate together, making the system suitable for vessels with multiple propulsion engines and auxiliary generators.

Why Oil Mist Detection is Critical

Marine diesel engines operate under high mechanical loads and elevated temperatures. Developing faults such as overheated bearings, lubrication failure, excessive friction, or mechanical wear can rapidly generate oil mist inside the crankcase.

Continuous oil mist monitoring helps operators:

• Detect developing engine faults at an early stage

• Reduce the risk of crankcase explosions

• Protect expensive engine components

• Improve vessel safety

• Reduce unplanned downtime

• Support predictive and preventive maintenance

• Lower long-term repair costs

Early detection allows engineers to investigate abnormal conditions before major engine failures occur.

How the Graviner MK7 Works

The MK7 uses distributed detector heads rather than centralized sampling equipment.

Step 1 – Continuous Detector Monitoring

Each detector head continuously measures oil mist concentration inside its assigned crankcase compartment.

Step 2 – Optical Light Scatter Detection

The detector uses an optical light-scatter sensing principle to accurately measure oil mist density while maintaining excellent resistance to false alarms.

Step 3 – Digital Communication

Each detector converts its measurement into digital data and transmits it through the detector network to the engine-mounted control unit.

The control unit continuously supervises:

• Oil mist density

• Detector communication

• Detector health

• Alarm conditions

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.

The optional remote display installed in the Engine Control Room allows engineers to review detector status and oil mist levels without entering the machinery space during alarm conditions.

Key Features of the Graviner MK7 Oil Mist Detector

Intelligent Auto-Addressed Detector Heads

Each detector automatically identifies itself within the system, simplifying installation, maintenance, and fault identification.

Direct Crankcase Monitoring

Each detector head monitors one crankcase compartment directly, eliminating the need for external sampling pipes and reducing installation complexity.

Optical Light Scatter Technology

The MK7 uses advanced optical sensing technology to continuously monitor oil mist density with high sensitivity and dependable long-term performance.

Engine-Mounted Control Unit

Each engine is equipped with a dedicated control unit that receives detector data, processes alarms, and manages communication with the optional remote display.

Remote Touchscreen Display

The optional remote display unit provides an intuitive colour touchscreen interface that displays oil mist levels, detector status, alarms, and system information from a safe location such as the Engine Control Room.

Detector Isolation Capability

If maintenance is required, an individual detector can be isolated without interrupting monitoring of the remaining detectors, allowing the system to continue protecting the engine during servicing.

Reliable Marine Construction

The MK7 is engineered for demanding marine environments including:

• High ambient temperatures

• Continuous vibration

• High humidity

• Heavy engine loading

• Long operating hours

Typical Applications

The Graviner MK7 Oil Mist Detector is suitable for:

Commercial Cargo Ships

Continuous crankcase protection for propulsion and auxiliary engines.

Oil & Chemical Tankers

Reliable engine safety during long-distance cargo transportation.

Container Ships

Real-time engine monitoring for uninterrupted vessel operation.

Bulk Carriers

Early detection of abnormal crankcase conditions.

Offshore Support Vessels

Dependable engine monitoring in offshore environments.

Passenger Ships

Continuous monitoring of propulsion and auxiliary power systems.

Marine Power Generation

Protection for onboard diesel generator engines.

Shipyards

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

Industries We Serve

The Graviner MK7 Oil Mist Detector is widely used in:

• 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 MK7?

Typical users include:

• Chief Engineers

• Second Engineers

• Marine Engineers

• Engine Superintendents

• Technical Managers

• Shipowners

• Ship Management Companies

• Shipyards

• Offshore Maintenance Teams

Why Choose the Graviner MK7 Oil Mist Detector?

Marine operators choose the Graviner MK7 because it offers:

• Intelligent auto-addressed monitoring

• Individual detector heads

• Optical light-scatter detection

• Elimination of sampling pipework

• Fast fault identification

• Modular maintenance

• Engine-mounted control units

• Optional remote touchscreen display

• Proven marine reliability

The MK7 represents the latest evolution of Graviner oil mist detection technology, combining modern digital communication, intelligent diagnostics, and dependable engine protection for today's commercial marine industry.

Technical Overview

The Graviner MK7 Oil Mist Detector is an intelligent addressable crankcase oil mist detection system designed to provide continuous monitoring and protection for marine diesel engines. It uses individual optical detector heads installed directly on each crankcase compartment, allowing real-time monitoring without the need for traditional sampling pipes.

Each detector head continuously measures oil mist concentration and communicates digitally with the engine-mounted control unit. The controller supervises detector status, analyzes oil mist levels, manages alarm conditions, and records system events for efficient engine protection and maintenance.

Note: Technical specifications and system configurations may vary depending on engine type, number of detector heads, and installation requirements. Always confirm details using the equipment nameplate and manufacturer's documentation.

Main Components of the Graviner MK7 Oil Mist Detector

The MK7 consists of several integrated components that work together to provide reliable engine monitoring.

Engine-Mounted Control Unit

The engine-mounted control unit serves as the central processing system.

Its primary functions include:

• Continuous detector monitoring

• Oil mist analysis

• Alarm processing

• Detector communication management

• System diagnostics

• Event logging

• Operating status display

The controller continuously supervises every connected detector head.

Addressable Detector Heads

Each crankcase compartment is equipped with an individual detector head.

Each detector independently performs:

• Oil mist monitoring

• Optical measurement

• Digital signal processing

• Continuous communication with the controller

Every detector is individually identified by the system, enabling rapid fault localization.

Optical Sensor Assembly

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

The optical design provides:

• Stable measurements

• High sensitivity

• Fast response

• Reliable long-term operation

• Low maintenance requirements

Communication Network

All detector heads communicate digitally with the engine-mounted controller through the system communication network.

The communication network supports:

• Continuous detector supervision

• Detector identification

• Alarm transmission

• Fault diagnostics

• System health monitoring

Optional Remote Display Unit

The optional remote display allows engineers to monitor the complete system from locations such as the Engine Control Room.

The display provides:

• Detector status

• Alarm indication

• System diagnostics

• Event information

• Operating conditions

This improves accessibility while reducing the need to enter machinery spaces during alarm conditions.

Alarm System

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

• Audible Alarm

• Visual Alarm

• Alarm Output Signals

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

• Engine Monitoring System

• Alarm Monitoring System (AMS)

• Engine Protection System

Working Principle

The Graviner MK7 continuously monitors crankcase conditions while 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 the optical light scatter principle.

As oil mist concentration increases, changes in scattered light are detected and converted into measurement data.

Step 3 – Digital Data Processing

Each detector processes its own measurement before transmitting digital information to the engine-mounted control unit.

The controller continuously supervises:

• Oil mist density

• Detector communication

• Detector condition

• Alarm status

Step 4 – Alarm Activation

If the measured oil mist concentration exceeds the programmed alarm threshold, the control unit immediately:

• Identifies the affected detector

• Activates visual alarms

• Sounds audible alarms

• Transmits alarm signals to connected monitoring systems

This enables rapid investigation before significant engine damage develops.

Advantages of the Graviner MK7

Intelligent Addressable Monitoring

Every detector is individually identified, allowing immediate localization of abnormal crankcase conditions.

No Sampling Pipework

The elimination of sampling pipes provides several operational benefits:

• Reduced maintenance

• Simplified installation

• Improved reliability

• Fewer potential leakage points

Continuous Engine Protection

The MK7 continuously monitors crankcase conditions throughout engine operation.

Fast Fault Identification

The addressable detector architecture allows engineers to quickly determine which crankcase compartment requires inspection.

Modular System Design

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

Reliable Marine Construction

The MK7 is designed for demanding marine engine room environments, including:

• High temperatures

• Continuous vibration

• High humidity

• Heavy engine loading

• Long operating hours

Routine Maintenance

Routine maintenance helps ensure reliable long-term system performance.

Before Engine Operation

Inspect:

• Controller status

• Detector communication

• Alarm indicators

• Power supply

• System diagnostics

Confirm that the system indicates normal operating status before engine start.

Weekly Inspection

Check:

• Detector head condition

• Controller display

• Alarm indicators

• Electrical connections

• Visible contamination

Inspect for mechanical damage and excessive dirt accumulation.

Monthly Inspection

Inspect:

• Detector communication

• Optical sensor condition

• Controller operation

• Alarm outputs

• Wiring integrity

Clean detector surfaces if contamination is present.

Annual Maintenance

Recommended maintenance includes:

• Complete functional testing

• Detector performance verification

• Optical sensor inspection

• Electrical inspection

• Alarm verification

• Communication testing

• Calibration verification (if applicable)

All maintenance activities should be recorded within the vessel's Planned Maintenance System (PMS).

Common Operational Problems

Although the Graviner MK7 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, verify electrical connections, and confirm correct installation.

Problem: Detector Communication Failure

Possible Causes

• Communication wiring fault

• Loose connector

• Detector malfunction

• Controller communication issue

Recommended Solution

Inspect communication cables, verify detector connections, and replace defective components where required.

Problem: Display Not Operating

Possible Causes

• Power supply interruption

• Blown fuse

• Controller malfunction

• Loose electrical connection

Recommended Solution

Verify input power, inspect protective devices, and confirm controller wiring.

Problem: Alarm Does Not Activate

Possible Causes

• Alarm circuit fault

• Detector communication issue

• Controller malfunction

Recommended Solution

Perform functional testing, verify alarm outputs, and inspect detector communication.

Problem: Frequent System Fault Indications

Possible Causes

• Detector contamination

• Electrical noise

• Wiring issues

• Aging electronic components

Recommended Solution

Inspect the complete system, clean detector heads where necessary, and replace defective components if required.

Calibration Recommendations

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

Calibration is generally recommended:

• During scheduled maintenance

• After replacing detector heads

• Following major engine repairs

• After prolonged equipment shutdown

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

Genuine Spare Parts Available

Ship Care Service supplies genuine replacement parts for the Graviner MK7 Oil Mist Detector, including:

• Addressable Detector Heads

• Optical Sensor Assemblies

• Engine-Mounted Control Units

• Remote Display Units

• 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 MK7 Oil Mist Detector or replacement parts, consider the following:

Verify Engine Compatibility

Confirm compatibility with your engine model and existing monitoring system.

Confirm Equipment Details

Providing the model number, serial number, detector quantity, and system configuration helps identify the correct replacement components.

Select Genuine Components

Using genuine replacement parts helps maintain:

• Reliable monitoring

• System compatibility

• Accurate oil mist detection

• Long equipment life

• Safe engine operation

Choose an Experienced Marine Supplier

Partner with a supplier that provides genuine products, technical support, and after-sales service for marine engine safety systems.

Why Marine Operators Choose the Graviner MK7

The Graviner MK7 is trusted worldwide because it provides:

• Intelligent addressable detector technology

• Optical light scatter sensing

• Continuous crankcase monitoring

• Fast detector identification

• Modular maintenance

• Digital communication

• Reliable marine construction

• Advanced engine protection