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Overview
The operator interface panel on a Graviner MK6 oil mist detector is one of the most frequently used surfaces on the entire system. Every daily check, every alarm acknowledgement, every manual test sequence passes through the membrane function key panel on the front of the MK6 control unit. Over time — and across the years of continuous shipboard service that a Graviner MK6 system typically accumulates — that membrane keypad degrades. Keys lose tactile response, labels wear away, and eventually individual key functions become unreliable. When the operator interface fails on a safety-critical crankcase explosion protection system, the engineering team loses the ability to interact with the system correctly — and the vessel’s compliance with SOLAS crankcase protection requirements comes into question.
The Graviner MK6 Membrane Function Key Front, Part No. 39155-K047 is the OEM-referenced replacement front panel assembly for the Graviner MK6 oil mist detector control unit. It replaces the complete front membrane keypad and function key board — restoring the MK6 operator interface to its original specification, with fully functional key response, legible labelling, and correct operational feel — without requiring replacement of the entire MK6 control unit.
What makes the 39155-K047 the correct choice for MK6 operator interface restoration is that it is the manufacturer-referenced replacement component for this specific function. A non-OEM membrane panel may fit physically but introduce key mapping inconsistencies or connector incompatibilities that compromise the operator interface in ways that are not immediately apparent — and may only surface during an alarm event or survey functional test. The OEM part reference eliminates that risk and ensures the restored interface performs exactly as the MK6 system was designed to operate.
Key Features
Complete Front Membrane Function Key Replacement
The 39155-K047 replaces the entire front membrane function key assembly on the Graviner MK6 control unit — not just individual key caps or overlays. A complete front assembly replacement addresses all age-related degradation at once: worn key response, faded or illegible key labelling, and any underlying membrane circuit deterioration. For a system that may have been in service for ten or more years, a complete front assembly replacement is a more reliable restoration approach than attempting to address individual key failures incrementally.
OEM Part Reference — 39155-K047
The component is supplied under Graviner part number 39155-K047 — the manufacturer’s own part reference for the MK6 front membrane function key assembly. Sourcing this component against the OEM part number confirms that the replacement assembly is the correct specification for the MK6 control unit, with the correct key layout, connector configuration, and membrane circuit design. For vessels maintaining equipment records against manufacturer part numbers — as required under ISM Code planned maintenance system standards — the OEM part reference provides the documentary traceability that the vessel’s maintenance records require.
Restores Full Operator Interface Functionality
The MK6 membrane function key panel provides access to all primary operator functions on the Graviner MK6 system — alarm acknowledgement, system test initiation, detector channel selection, alarm threshold review, and system status display interaction. A degraded or non-functional key panel impairs the engineering team’s ability to operate the system correctly in any of these modes. Replacing the front membrane assembly with the 39155-K047 restores all of these functions to their designed performance level — giving the engineering team back full, reliable control over the MK6 system.
Cost-Effective Alternative to Full Control Unit Replacement
Replacing an entire Graviner MK6 control unit because the front membrane key panel has degraded is a significant and unnecessary cost. The 39155-K047 front assembly is a component-level replacement that addresses the specific failure mode — the operator interface — without requiring replacement of the entire control unit, the internal electronics, or the wiring connections to the detector network. For vessels managing maintenance budgets carefully, a front membrane assembly replacement at component cost is the practical and proportionate maintenance response to operator interface degradation.
Directly Compatible with Graviner MK6 Control Unit
The 39155-K047 is designed specifically for the Graviner MK6 oil mist detector control unit. Direct OEM compatibility means the replacement assembly fits the MK6 front panel mounting without modification, connects to the internal PCB with the correct connector configuration, and aligns with the MK6 display window and mounting hardware. For marine engineers carrying out the replacement on board, a directly compatible OEM assembly is the component that installs without complications — particularly important when the replacement is being carried out under time pressure during a port call or survey period.
Technical Specifications
Manufacturer: Graviner (a Kidde brand)
Part Number: 39155-K047
Description: MK6 Membrane Function Key Front Panel Assembly
Compatible System: Graviner MK6 Oil Mist Detector Control Unit
Component Type: Front panel membrane keypad and function key board replacement
Category: Oil Mist Detector Spare Parts
Application: Replacement of degraded or non-functional MK6 operator interface front panel
Benefits
Restores reliable operator control over a safety-critical crankcase protection system. A worn or unresponsive membrane key panel on the Graviner MK6 is not just an inconvenience — it is a functional impairment to a system that exists to protect the engine room from crankcase explosions. Replacing the front membrane assembly with the 39155-K047 restores the engineering team’s ability to operate, test, and acknowledge alarms on the MK6 system with confidence, without uncertainty about whether a key press has been registered correctly.
Avoids the cost and lead time of full control unit replacement. A complete Graviner MK6 control unit is a significant procurement — in cost, lead time, and installation effort. A front membrane key assembly replacement addresses the actual failure mode at a fraction of the cost, with a substantially simpler installation procedure. For vessels where the MK6 electronic and detection systems remain fully functional, a control unit replacement solely because of a degraded operator interface is a disproportionate maintenance response.
Supports system presentability for class survey and port state control inspection. A Graviner MK6 system with a visibly worn, partially illegible, or unresponsive front panel does not present well during a class renewal survey or port state control inspection — even if the underlying detection system is functioning correctly. A restored front panel with clear labelling and reliable key response presents the system in the condition that reflects the level of maintenance the vessel’s safety management system is supposed to deliver.
OEM part number supports clean maintenance record documentation. Logging the 39155-K047 replacement against the manufacturer part number in the vessel’s planned maintenance system provides a clean, auditable maintenance record — confirming that the MK6 operator interface was restored using the correct OEM component, to the manufacturer’s specification. This level of documentation is consistent with ISM Code safety management system requirements for safety equipment maintenance records.
Extends the operational service life of an existing MK6 installation. Graviner MK6 oil mist detector systems have long service histories — many installations in the current commercial fleet are well over a decade old. Component-level maintenance, including front panel membrane replacement, is the practical approach to extending the service life of a reliable and class-approved OMD installation, avoiding premature full system replacement before the underlying detection system has reached the end of its useful service life.
Who It’s For
The Chief Engineer Managing Graviner MK6 Maintenance on Board
The MK6 front panel on your engine room OMD control unit has been in service for years. The key labelling is fading, several keys feel unresponsive, and the last time you tried to run a manual test cycle you were not confident that all the key inputs were registering correctly. You need the correct replacement front assembly — the OEM part, referenced by manufacturer part number — to carry out the replacement properly during the vessel’s next port call, and have the restored system ready for the upcoming class survey.
The Marine Equipment Service Engineer or Graviner Service Technician
You service and maintain Graviner MK6 oil mist detector systems on vessels calling at your port or during drydocking periods. You encounter MK6 control units with degraded front panels regularly — it is one of the most common age-related maintenance items on the MK6 platform. Having the 39155-K047 front membrane assembly in your service stock means you can carry out the front panel restoration as part of a planned service visit, without requiring the vessel to wait for a spare to be sourced after the deficiency is identified on board.
The Fleet Technical Superintendent or Ship Manager
You manage the planned maintenance programme for a fleet with Graviner MK6 OMD installations across multiple vessels. Front membrane key degradation is a predictable maintenance item on long-service MK6 installations — you know it will need to be addressed on the older vessels in your fleet, and you want to address it proactively, before a survey deficiency or operator complaint forces an unplanned maintenance response. Procuring 39155-K047 front assemblies as part of a scheduled maintenance programme is the approach that keeps the MK6 systems across your fleet in the condition your safety management system requires.
Possible Applications
- Age-related membrane key degradation on long-service MK6 installations — Planned replacement of worn or fading front panels on MK6 control units that have accumulated years of continuous shipboard service in engine room environments
- Pre-survey MK6 system restoration — Front panel replacement carried out in advance of class renewal surveys, annual surveys, or port state control inspections, ensuring the MK6 system presents in correct operational condition
- Post-incident operator interface failure — Emergency replacement following membrane key failure caused by accidental damage, liquid ingress, or sudden membrane circuit failure during vessel operations
- Drydock planned maintenance programmes — Systematic front panel replacement across all MK6 control units on board during scheduled drydocking, as part of a comprehensive Graviner OMD system overhaul
- Marine equipment service company service visits — Component held by authorised Graviner service agents for supply and installation during contracted MK6 service visits at port or during drydocking
- Fleet spare parts inventory provisioning — Maintained as a ship’s spare on vessels with MK6 installations, ensuring the front panel replacement can be carried out on demand without procurement lead time dependency
- Second-hand vessel acquisitions and MK6 system recommissioning — Front panel replacement as part of a comprehensive MK6 system inspection and restoration programme following vessel purchase or change of management
- Marine spare parts distributors — Stocked as a Graviner MK6 spare parts item for supply to vessels, ship managers, and service engineers requiring the 39155-K047 at short notice
Trust and Certifications
Graviner — A Kidde Brand, With a Long History in Marine Crankcase Protection
Graviner is one of the most established names in marine engine room safety, with a history of oil mist detection development spanning decades. The MK6 is a mature, widely-deployed platform with installations across thousands of commercial vessels globally — accepted by all major classification societies as a compliant means of crankcase explosion protection under SOLAS requirements. Spare parts supplied under Graviner OEM part references carry the manufacturer’s own traceability and specification assurance — which matters for safety system components that will be relied upon to support the vessel’s SOLAS compliance.
SOLAS Chapter II-1 — Crankcase Explosion Protection Requirements
SOLAS Chapter II-1 requires crankcase explosion protection on main propulsion engines above a specified bore size. The Graviner MK6 is an accepted means of compliance with this requirement. Maintaining the MK6 system in fully operational condition — including a correctly functioning operator interface — is a component of the vessel’s ongoing compliance with this SOLAS requirement. A front panel membrane replacement using the OEM-referenced 39155-K047 assembly is the correct maintenance standard for ensuring the operator interface remains functional and compliant.
Classification Society Type Approval — Graviner MK6
The Graviner MK6 oil mist detector system carries type approval from major classification societies including Lloyd’s Register, DNV, Bureau Veritas, ClassNK, and ABS. Type approval confirms that the system design has been independently evaluated and accepted as meeting the relevant safety standards. Using OEM-referenced spare parts — including the 39155-K047 front membrane assembly — is consistent with maintaining the MK6 system in its type-approved configuration, which is the standard against which class surveyors assess the system during periodic surveys.
Supplied by Alright Engineering Solutions
The Graviner MK6 Membrane Function Key Front 39155-K047 is supplied through Alright Engineering Solutions Pte. Ltd., a Singapore-based authorised distributor of marine safety and gas detection equipment. Alright Engineering Solutions maintains stock of Graviner MK6 and MK7 spare parts for rapid supply to vessels calling at Singapore and for air freight delivery to vessels at other ports. Our team can provide technical guidance on MK6 spare parts sourcing and assist with procurement of additional Graviner system components alongside the 39155-K047.
Accessories and Variants
Graviner MK6 Commissioning Kit — Part No. D9221-026
Following a front panel membrane replacement, a functional test and recommissioning of the MK6 system confirms that the operator interface is responding correctly and that the system is operating to specification. The Graviner Commissioning Kit D9221-026 — compatible with both MK6 and MK7 units — provides the equipment needed to carry out this post-maintenance functional verification. Alright Engineering Solutions can supply the D9221-026 commissioning kit alongside the 39155-K047 front assembly for a complete maintenance and recommissioning package.
Additional Graviner MK6 Spare Parts
Alright Engineering Solutions can assist with sourcing additional Graviner MK6 spare parts — detector heads, PCB assemblies, power supply components, communication modules, and other system spare parts — for vessels requiring a broader MK6 system maintenance programme alongside the front panel replacement. Contact our team with your MK6 part references and requirements for availability and quotation.
Graviner MK7 Oil Mist Detector — System Upgrade Option
For vessels where the Graviner MK6 installation is approaching the end of its service life and a full system upgrade is being considered, Alright Engineering Solutions can provide information on the Graviner MK7 — the current-generation Graviner OMD platform with enhanced detection capability and updated communication interfaces. Contact our team to discuss MK6 to MK7 upgrade options and the procurement process for new MK7 system supply.
Related Products from Alright Engineering Solutions
Graviner Commissioning Kit D9221-026 — OEM commissioning tool set for Graviner MK6 and MK7 functional testing and alarm threshold verification
Portable Multi-Gas Monitors (ATEX/MED Certified) — For confined space entry and hazardous area gas testing in engine rooms and cargo spaces
Fixed Gas Detection Systems — Engine room and machinery space fixed gas detection for hydrocarbon, CO, H₂S, and O₂ monitoring
Marine Safety System Spare Parts — Fire detection, gas detection, and safety system spare components across a wide range of OEM platforms in the commercial marine fleet
Get in Touch
If you need to source the Graviner MK6 Membrane Function Key Front 39155-K047 for a planned maintenance programme, pre-survey restoration, or urgent on-board replacement — contact Alright Engineering Solutions to confirm availability and request a formal quotation.
Our team can also assist with sourcing additional Graviner MK6 spare parts and related marine safety system components for your vessel or fleet maintenance requirements.
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