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Overview
The Graviner MK-5 is one of the most trusted oil mist detector systems in the marine industry, widely installed on main engines and auxiliary diesel engines aboard merchant vessels, naval ships, and offshore platforms worldwide. Designed to detect dangerous oil mist concentrations inside engine crankcases before they ignite, the MK-5 system plays a direct role in preventing crankcase explosions — one of the most destructive and potentially fatal failures in marine engine operations. Like any safety-critical system with years of continuous service, the MK-5 requires periodic component maintenance to remain fully functional and survey-compliant.
The Graviner MK-5 Oil Mist Detector Pressure Switch Assembly is a refurbished replacement pressure switch for the MK-5 oil mist detection system. The pressure switch is a core operational component within the MK-5 — responsible for monitoring the pressure differential that confirms correct airflow and system operation through the detector sampling circuit. When this switch fails or degrades, it can cause system faults, false alarms, or — critically — suppress legitimate alarm activation, undermining the entire purpose of the safety system.
What makes this component the correct choice for MK-5 maintenance is straightforward: it is a genuine Graviner-referenced assembly for the MK-5 platform, supplied in refurbished and tested condition. For chief engineers, marine superintendents, and ship management procurement teams sourcing MK-5 spare parts for an active vessel maintenance programme or upcoming class survey — where exact component compatibility is non-negotiable — this refurbished OEM-referenced pressure switch assembly provides the functional restoration and procurement confidence that generic or unverified alternatives cannot offer.
Key Features
Direct Compatibility with Graviner MK-5 Oil Mist Detector
This pressure switch assembly is the manufacturer-referenced component for the Graviner MK-5 oil mist detection system. The MK-5 is a precision safety instrument — its internal components are not interchangeable with generic pressure switches of similar specification. Using the correct OEM-referenced assembly ensures that the replaced component integrates correctly with the MK-5’s sampling circuit and alarm logic without requiring system reconfiguration or risking spurious alarm behaviour caused by incompatible switch characteristics.
Pressure Differential Monitoring — The Safety Function at Its Core
The pressure switch monitors the airflow pressure differential across the MK-5 sampling circuit, confirming that the system is actively drawing crankcase air samples through the detector head as designed. If airflow is lost — due to a blocked sample pipe, fan failure, or other circuit fault — the pressure switch detects the loss of differential pressure and triggers a system fault alarm. This function is what ensures the MK-5 is actually sampling the crankcase atmosphere and not simply sitting idle while a dangerous oil mist concentration builds undetected.
Brass Body Construction with Connector Terminations
The switch assembly features a brass body with integrated wiring and connector terminations — visible in the component image. Brass construction provides corrosion resistance suitable for the engine room environment, where humidity, oil vapour, and temperature cycling are constant operating conditions. The pre-terminated connector assembly simplifies installation and replacement, reducing the risk of wiring errors during maintenance that could affect switch function or system alarm circuit integrity.
Refurbished Condition — Inspected and Tested
The assembly is supplied in refurbished condition, inspected and functionally tested before supply. For a safety-critical component in an oil mist detection system, the difference between tested refurbished and untested used condition is significant. A pressure switch supplied without functional verification introduces uncertainty about its switching threshold accuracy and contact reliability — two parameters that directly affect whether the MK-5 system will correctly detect and alarm on a loss of sampling airflow. Tested refurbished condition provides documented functional assurance appropriate for a safety system spare part.
Suitable for Long-Service MK-5 Installations
The Graviner MK-5 has been in production and active service for decades, with many installations now 15–25 years into their operational life. New OEM spare components for older MK-5 variants can be difficult to source, on extended lead time, or priced at a significant premium. Refurbished OEM-referenced components available through specialist marine safety equipment suppliers provide a practical and cost-effective maintenance solution for vessels where the MK-5 system is still installed, operational, and required to remain survey-compliant.
Technical Specifications
Component: Pressure Switch Assembly
Compatible System: Graviner MK-5 Oil Mist Detector
Manufacturer: Graviner (Kidde / UTC Fire & Security)
Model: MK-5
Description: MK-5 Oil Mist Detector Pressure Switch Assembly
Body Material: Brass
Termination: Pre-wired with connector assembly
Category: PCBs & Electrical Components
Condition: Refurbished
Benefits
Restores full MK-5 system operational status after pressure switch failure. A faulty or degraded pressure switch in the MK-5 sampling circuit can generate persistent system fault alarms, prevent the system from clearing alarm conditions, or — in the worst case — allow the system to appear operational while no longer correctly monitoring sampling airflow. Replacing the pressure switch assembly with the correct OEM-referenced component restores the MK-5’s pressure monitoring function and returns the system to full operational and alarm-ready status.
Supports class survey compliance and engine room safety system readiness. Classification society surveyors inspect oil mist detector systems for correct operation during machinery surveys. An MK-5 with a faulty pressure switch that is generating faults or has been bypassed to suppress nuisance alarms is unlikely to pass survey without corrective action. Having the correct replacement pressure switch assembly available — or installed before the survey — ensures the system is presented in fully operational condition.
Reduces crankcase explosion risk by maintaining detector system integrity. The MK-5’s entire protective function depends on the sampling circuit operating correctly — and the pressure switch is what confirms that the circuit is working. A failed pressure switch that goes undetected or unreplaced means the vessel is operating with an oil mist detection system that cannot verify its own airflow, reducing confidence in the system’s ability to provide early warning of a developing crankcase oil mist condition.
Cost-effective alternative to new OEM parts for long-service MK-5 installations. For vessels where the MK-5 system has been in service for 15 or more years, new OEM spare components may carry premium pricing or extended lead times that are impractical for vessel maintenance schedules. A tested refurbished pressure switch assembly sourced through a specialist marine safety equipment supplier provides a functionally equivalent maintenance solution at a cost and lead time that supports operational vessel maintenance planning.
Who It’s For
The Chief Engineer or Second Engineer Managing MK-5 Maintenance
You’ve got a Graviner MK-5 on the main engine generating a persistent fault alarm or showing intermittent system faults that the diagnostic log is pointing toward the pressure switch circuit. The system is still operational but you’re heading into port in two weeks with a class survey on the agenda. You need the correct pressure switch assembly — not a generic substitute — confirmed compatible with the MK-5 and available on a lead time that works for your maintenance window. You need a tested component you can install with confidence, not a part that creates more troubleshooting after installation.
The Marine Superintendent or Technical Superintendent Overseeing Fleet Maintenance
You manage a fleet of vessels with Graviner MK-5 oil mist detectors installed across multiple engines, and MK-5 spare parts are a recurring requirement in your planned maintenance system. Sourcing reliable refurbished MK-5 components — pressure switches, PCBs, sampling heads — through a supplier who can confirm part compatibility and provide tested condition stock reduces the procurement risk of receiving components that arrive incorrect or non-functional, which costs more in delays and repeat ordering than the original component price difference.
Possible Applications
- Main engine crankcase oil mist detection maintenance — Pressure switch replacement on MK-5 systems installed on two-stroke and four-stroke main propulsion engines aboard container ships, bulk carriers, tankers, and general cargo vessels
- Auxiliary diesel engine protection systems — MK-5 component maintenance on generator engine installations where crankcase oil mist detection is required by class rules or flag state regulations
- Offshore platform and FPSO engine room maintenance — Spare parts sourcing for MK-5 installations on offshore diesel generator and propulsion engine systems where replacement lead time and component reliability are critical operational requirements
- Drydock and class renewal survey preparation — Pre-survey MK-5 system restoration and component replacement during scheduled drydocking to ensure oil mist detection systems pass machinery survey inspection
- Naval vessel engine room maintenance — MK-5 component sourcing for naval and coast guard vessel machinery maintenance programmes where Graviner systems are installed on propulsion and auxiliary diesel engines
- Fleet spare parts provisioning — Stock spare component procurement for ship management companies maintaining MK-5 spare parts inventories across managed fleets with multiple MK-5-equipped vessels
- Marine engineering and safety equipment service companies — Component sourcing for MK-5 system service, repair, and maintenance contracts on vessels with Graviner installations under service agreement
Trust and Certifications
Graviner MK-5 — Industry-Established Marine Safety System
Graviner (now part of Kidde / UTC Fire & Security) is the originating manufacturer of the MK-5 oil mist detector — a system that has been installed on marine engines worldwide for decades and remains one of the most recognised oil mist detection platforms in the marine industry. The MK-5’s long service history means many vessels currently in operation carry MK-5 systems that are well past the point where new OEM parts are readily available through standard distribution channels, making reliable refurbished OEM-referenced component sourcing an important part of the MK-5 maintenance ecosystem.
IMO Resolution A.1050(27) — Oil Mist Detector Requirements
IMO Resolution A.1050(27) establishes requirements for crankcase oil mist detectors and their performance standards on seagoing vessels. Oil mist detectors installed under this resolution — including the Graviner MK-5 — must be maintained in operational condition to satisfy flag state and class survey requirements. A pressure switch assembly replacement that restores the MK-5 to full operational status supports the vessel’s compliance with the IMO resolution requirements that underpin the installation and maintenance obligation for oil mist detection systems on applicable engines.
Classification Society Survey Compliance
All major classification societies — Lloyd’s Register, DNV, Bureau Veritas, ClassNK, ABS, and others — require that crankcase oil mist detectors fitted on engines above a specified bore diameter are maintained in operational condition and verified during machinery surveys. Sourcing the correct OEM-referenced pressure switch assembly for an MK-5 system that has developed a fault supports the vessel’s ability to present the oil mist detection system in survey-ready condition and avoid the deficiency or condition of class notation that a faulty or non-operational oil mist detector can attract.
Refurbished and Tested — Functional Verification Before Supply
The pressure switch assembly is supplied in refurbished condition, inspected and tested for functionality before supply. For a component whose correct operation directly affects whether an oil mist detection system can identify a developing crankcase alarm condition, tested refurbished condition provides the functional confidence appropriate for a safety-critical spare part — not just a visual inspection and cosmetic cleaning.
Supplied by Alright Engineering Solutions
The Graviner MK-5 Pressure Switch Assembly is supplied through Alright Engineering Solutions Pte. Ltd., a specialist distributor of marine safety equipment, gas detection systems, and engine room safety components in Singapore. Alright Engineering Solutions provides spare parts sourcing support for marine gas detection, oil mist detection, and fire safety systems across the Singapore and regional market.
Accessories and Variants
Additional Graviner MK-5 System Spare Components
Alright Engineering Solutions can assist with sourcing additional Graviner MK-5 system spare parts — PCB assemblies, detector heads, sampling tubes, alarm relay boards, and associated MK-5 system components — for vessel maintenance programmes and fleet spare parts provisioning. Contact our team with your MK-5 component requirements for availability and quotation.
Graviner MK-4 and MK-6 System Components
For vessels equipped with earlier or later Graviner oil mist detector variants — including the MK-4 and MK-6 — Alright Engineering Solutions can provide guidance on spare parts availability and sourcing options for related Graviner system components.
Engine Room Oil Mist and Gas Detection Products
GTYQ-DX 102 Fixed Combustible Gas Detector — Fixed gas detection point with 4–20mA and RS485 output for engine room hydrocarbon monitoring
GX-8000 Sample Draw Multi Gas Monitor — Portable marine sample draw multi-gas monitor for vessel confined space entry and engine room gas surveys
RX-8700 Portable Gas Detector — Portable multi-gas monitor with ATEX/IECEx/MED certification for marine applications
Salwico CS3000 Fixed Gas Detection Spare Parts — Display LCD PCBs and system components for Salwico CS3000 fixed gas and fire detection systems
Get in Touch
If you need to source the Graviner MK-5 Oil Mist Detector Pressure Switch Assembly for a vessel maintenance requirement — whether for an immediate engine room repair, a scheduled drydock programme, or fleet spare parts provisioning — contact Alright Engineering Solutions to confirm availability and request a formal quotation.
Our team can also assist with sourcing additional MK-5 system spare parts and related marine safety equipment components for your vessel or fleet maintenance programme.
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