Graviner MK5 Oil Mist Detection
GRAVINER
Refurbished
Graviner MK5 Oil Mist Detector (OMD) | Marine Main Engine Oil Mist Detection System | Fire & Explosion Protection | SM MARINE SERVICE™
The Graviner MK5 Oil Mist Detector (OMD) is one of the most widely installed marine engine safety systems used on two-stroke and four-stroke diesel engines. Designed to continuously monitor crankcase oil mist concentration, the MK5 provides early warning of abnormal conditions that could lead to crankcase explosions, severe engine damage, or vessel downtime.
By continuously sampling air from each crankcase compartment, the MK5 detects rising oil mist levels before dangerous conditions develop. If the oil mist concentration exceeds preset alarm limits, the system immediately activates audible and visual alarms, enabling engineers to take corrective action before a catastrophic engine failure occurs.
The Graviner MK5 has earned a strong reputation across the maritime industry for its reliability, accuracy, and compliance with SOLAS and classification society requirements. It is widely installed on MAN B&W, Wärtsilä, Sulzer, Mitsubishi, Daihatsu, Yanmar, Himsen, MAK, and other major marine diesel engines.
SM MARINE SERVICE™ supplies new, used, and professionally reconditioned Graviner MK5 Oil Mist Detectors, including control units, detector heads, sampling manifolds, display modules, PCB boards, spare parts, repair services, calibration, and worldwide technical support.
| Item | Details |
|---|---|
| Manufacturer | Kidde Graviner Ltd. |
| Product | MK5 Oil Mist Detector |
| Product Type | Oil Mist Detection System (OMD) |
| Marine Application | Main Engine Crankcase Protection |
| Compliance | SOLAS / IACS / Marine Classification Rules |
The Graviner MK5 is an intelligent monitoring system designed to detect microscopic oil particles suspended inside a diesel engine crankcase.
During normal engine operation, oil mist levels remain very low. However, bearing failures, overheating, friction, or lubrication problems can rapidly increase oil mist concentration. If left undetected, this can ignite and result in a crankcase explosion, causing severe engine damage and serious safety risks.
The MK5 continuously samples air from each crankcase compartment, measures oil mist density using optical sensing technology, and compares the readings against preset alarm thresholds. When abnormal levels are detected, the system generates alarms and can interface with engine protection systems.
The Graviner MK5 offers advanced protection features, including:
Discover the Graviner MK5 Oil Mist Detector (OMD)
The Graviner MK5 Oil Mist Detector is composed of several intelligent electronic and mechanical assemblies that work together to continuously monitor crankcase oil mist levels. Each component plays a vital role in ensuring early detection of hazardous conditions and protecting the main engine from crankcase explosions.
The Control Unit is the central processor of the MK5 system.
Functions include:
The optical sensor measures the density of oil mist particles using light scattering technology.
Advantages include:
The sampling manifold collects air from each crankcase compartment through dedicated sampling pipes.
Its functions include:
Each crankcase sampling point is equipped with a valve that allows the detector to sample one compartment at a time.
This provides:
The internal sampling pump continuously draws crankcase air through the detector.
The pump ensures:
The display panel provides engineers with real-time operating information.
It indicates:
The power supply provides stable operating voltage to all internal electronics.
Protection features include:
The relay outputs can interface with:
Specifications may vary depending on system configuration and engine application.
| Specification | Details |
|---|---|
| Manufacturer | Kidde Graviner Ltd. |
| Model | MK5 Oil Mist Detector |
| Detection Method | Optical Light Scattering |
| Product Type | Oil Mist Detection System |
| Sampling Method | Automatic Sequential Sampling |
| Installation | Main Engine Crankcase |
| Alarm Output | Visual & Audible |
| Interface | AMS / IAS / Engine Protection System |
| Compliance | SOLAS / IACS / Marine Classification Rules |
The Graviner MK5 is widely installed on:
| Problem | Possible Cause | Recommended Solution |
|---|---|---|
| Oil mist alarm | Bearing overheating or abnormal oil mist | Inspect crankcase immediately and identify the source |
| High oil mist reading | Lubrication failure or mechanical wear | Check bearings, lubrication system, and engine condition |
| Sampling fault | Blocked sampling pipe | Clean or replace sampling tubing |
| Pump failure | Worn sampling pump | Repair or replace the pump |
| Sensor fault | Dirty optical chamber | Clean optical detector and recalibrate |
| Communication failure | Cable or PCB issue | Inspect communication wiring and control PCB |
| False alarm | Moisture, contamination, or dirty optics | Clean sensor and verify calibration |
| No display | Power supply problem | Check power input and internal PSU |
Routine calibration and periodic functional testing are recommended to maintain system accuracy.
To ensure long-term reliability, perform the following maintenance:
The Graviner MK5 remains one of the industry's preferred Oil Mist Detection systems because of its:
It has protected thousands of marine diesel engines around the world for decades.
It continuously monitors crankcase oil mist concentration and provides early warning of abnormal conditions that could lead to crankcase explosions.
The MK5 is widely installed on engines manufactured by:
Yes. Most faults involving control units, optical sensors, sampling pumps, display modules, PCB boards, power supplies, and relay circuits can be repaired by experienced marine electronics engineers.
Frequently supplied spare parts include:
Yes. We supply new, used, and professionally reconditioned Graviner MK5 Oil Mist Detectors, spare parts, PCB repair, calibration services, overhaul, and worldwide technical support.
The Graviner MK5 Oil Mist Detector (OMD) is a highly reliable marine engine safety system that continuously monitors crankcase oil mist concentration using advanced optical detection technology. It provides early warning of abnormal engine conditions, helping prevent crankcase explosions and ensuring compliance with international marine safety standards.
For installation, commissioning, calibration, troubleshooting, maintenance, and repair procedures, always refer to the official Graviner MK5 Installation Manual, Service Manual, Operation Manual, Calibration Guide, Wiring Diagram, and Spare Parts Catalogue corresponding to the exact MK5 system configuration.
The Graviner MK5 Oil Mist Detector is one of the most trusted crankcase protection systems in the maritime industry. Its advanced optical sensing technology, intelligent diagnostics, and proven reliability help safeguard marine diesel engines from potentially catastrophic crankcase explosions. Regular maintenance and timely calibration ensure dependable performance throughout the vessel's operational life.
Whether you require a complete Graviner MK5 Oil Mist Detector, control unit, display module, sampling head, optical sensor, PCB repair, calibration, or replacement spare parts, SM MARINE SERVICE™ provides professional marine engine safety solutions with worldwide sourcing, repair, testing, and technical support.
SM MARINE SERVICE™ is a trusted global supplier of marine automation, navigation, communication, fire & safety systems, engine room automation, oil mist detectors, VDR/S-VDR, radar, ECDIS, hydraulic systems, and marine electronic spare parts.
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Website: www.smmarineservice.com
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Marketing Contact: Nazmul Hasan Bhuiyan
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