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Overview
The interface PCB is the nerve centre of the Graviner MK6 oil mist detector control unit — the board that manages the signal inputs from every detector head connected to the system, processes those inputs against configured alarm thresholds, and drives the relay outputs that trigger engine slowdown, shutdown, and alarm signals when an oil mist event is detected. Every alarm the MK6 system generates, every relay output it activates, and every external system it communicates with passes through the interface PCB. When this board fails or degrades, the MK6 system does not simply underperform — it loses the ability to process detector signals and act on them, which means it loses the ability to protect the engine room from crankcase explosion.
The Graviner MK6 Interface PCB GL Selectable, Part No. 44782-K183X, is the latest revised interface board for the Graviner MK6 oil mist detector control unit. Identifiable by its two PSU (power supply unit) configuration — visible in the product image and the key distinguishing feature of the revised board — the 44782-K183X is confirmed as fully interchangeable with any previous version of the MK6 OMD control unit interface board. This complete backward compatibility makes it the correct replacement interface PCB for every MK6 control unit currently in service, regardless of the board revision or control unit generation currently installed.
The differentiating factor of the 44782-K183X over earlier MK6 interface board versions is the latest revised specification combined with universal MK6 control unit compatibility. For marine engineers and procurement teams sourcing an MK6 interface board replacement, this means there is no need to identify the exact interface board revision currently fitted before ordering — the 44782-K183X replaces all previous versions, installs into any MK6 control unit, and brings the latest revised interface board specification to any MK6 installation in the process.
Key Features
Latest Revised MK6 Interface Board — Identified by Dual PSU Configuration
The 44782-K183X is the latest revised generation of the Graviner MK6 interface PCB, identifiable by its two PSU configuration — two power supply units mounted on the board, as visible in the product image above. This dual PSU layout is the manufacturer’s own visual identifier for the latest revised interface board specification, distinguishing the 44782-K183X from earlier single-PSU interface board versions. When receiving and installing the replacement board, the dual PSU configuration provides immediate visual confirmation that the component is the correct latest revised version — a useful identification check in a maintenance environment where multiple board generations may have been encountered across a long-service fleet.
Full Interchangeability with All Previous MK6 OMD Control Unit Versions
The 44782-K183X is confirmed as fully interchangeable with any previous version of the Graviner MK6 OMD control unit. This complete backward compatibility is the most practically important specification for procurement teams and marine engineers sourcing MK6 interface board replacements: it means the 44782-K183X is the correct replacement for every MK6 control unit in service, without requiring identification of the existing board revision before ordering. For fleet technical superintendents managing MK6 spare parts across multiple vessels with varying MK6 installation ages, a single interface board part number that covers the entire MK6 control unit population significantly simplifies spare parts inventory management.
GL Selectable — Configurable Alarm Logic
The “GL Selectable” designation indicates that the 44782-K183X interface board supports configurable alarm logic — allowing the MK6 system’s alarm output behaviour to be set for the specific engine protection scheme required for the installation. Different vessels and engine types may require different alarm relay configurations — engine slowdown only, immediate shutdown, or graduated response — and the GL selectable functionality provides the configuration flexibility needed to match the interface board’s relay output behaviour to the vessel’s engine protection requirements. This configurability is a practical advantage for service engineers commissioning the board into a replacement installation.
Manages All Detector Head Signal Inputs and Relay Outputs
The interface PCB receives the oil mist concentration signals from all MK6 detector heads connected to the system, compares them against the configured alarm thresholds, and activates the appropriate relay outputs when a threshold is exceeded. The relay outputs drive the external systems that respond to an OMD alarm — engine control systems, alarm panels, bridge displays, and automatic protection systems. The reliability and correct configuration of these relay outputs is fundamental to the MK6 system’s ability to deliver its protective function. A failed or incorrectly configured interface PCB means these relay outputs cannot be trusted — and the downstream protection systems they drive cannot respond correctly to a real oil mist event.
Direct Drop-In Replacement for MK6 Control Unit Interface Board
The 44782-K183X is designed as a direct replacement board for the MK6 control unit — with the correct form factor, connector layout, and mounting configuration to install into the existing MK6 control unit enclosure without modification. For marine engineers carrying out the replacement on board or service engineers attending during a port call, a direct drop-in replacement board minimises installation time and eliminates the risk of installation complications — critical when the replacement is being carried out under time pressure during a port call or pre-survey period.
Available in New and Refurbished Condition
The 44782-K183X is available in both new and refurbished condition. New condition provides factory-specification supply for new MK6 control unit builds or interface board replacements where new condition is the required standard. Refurbished condition — inspected, tested, and verified before supply — provides a cost-effective and often more rapidly available option for vessels replacing a failed interface board on a long-service MK6 installation. Contact Alright Engineering Solutions to confirm current stock availability for each condition.
Technical Specifications
Manufacturer: Kidde Graviner
Part Number: 44782-K183X
Description: MK6 Oil Mist Detector Interface PCB GL Selectable — Latest Revised
Compatible System: Graviner MK6 Oil Mist Detector Control Unit
Compatibility: Fully interchangeable with all previous Graviner MK6 OMD control unit versions
Identification: Dual PSU (two power supply units) configuration — latest revised board
Function: Detector head signal input processing, alarm threshold comparison, relay output activation
Alarm Logic: GL Selectable (configurable relay output behaviour)
Category: Oil Mist Detector Spare Parts / Control Unit PCB Assembly
Condition: New and Refurbished (both available)
Benefits
Restores full signal processing and relay output capability to the MK6 control unit. A failed MK6 interface PCB means the control unit cannot process detector head signals, cannot compare concentrations against alarm thresholds, and cannot activate the relay outputs that drive the engine’s protection response. Replacing the interface board with the 44782-K183X restores all of these functions — returning the MK6 system to its designed operational state, where every detector head input is being processed correctly and every relay output will respond as configured when an alarm condition is detected.
Latest revised specification across the MK6 control unit without a full unit replacement. Fitting the 44782-K183X upgrades the MK6 control unit to the latest revised interface board specification — improving on the earlier board design at component replacement cost, without requiring replacement of the entire control unit, enclosure, or wiring connections. For long-service MK6 installations where the control unit is otherwise functional, an interface board replacement is the correct and proportionate maintenance response to a board failure.
Universal MK6 compatibility eliminates pre-order revision research. The confirmed full interchangeability of the 44782-K183X with all previous MK6 control unit versions means procurement teams and marine engineers do not need to identify the exact interface board revision currently installed before placing an order. This simplification reduces procurement lead time and eliminates the risk of ordering an incorrect board revision — a particularly valuable benefit when the replacement is being sourced under time pressure before a class survey or port departure.
GL Selectable alarm logic supports correct installation across different engine protection schemes. The configurable alarm logic on the 44782-K183X ensures the replacement interface board can be set up to match the relay output behaviour required for the specific vessel’s engine protection scheme — rather than being locked to a fixed output configuration that may not match the installation requirements. This configuration flexibility simplifies the commissioning process for service engineers fitting the board as a replacement.
Supports ISM Code maintenance documentation with OEM part reference traceability. Recording the 44782-K183X interface board replacement against the Graviner OEM part number in the vessel’s planned maintenance system provides a clean, auditable maintenance record — confirming that the MK6 control unit’s core signal processing board was replaced using the manufacturer’s own latest revised component. For vessels audited under ISM Code safety management system standards, this level of documentation is the expected standard for safety-critical equipment maintenance records.
Who It’s For
The Chief Engineer or Second Engineer Managing MK6 Interface Board Failure On Board
The MK6 control unit is showing symptoms of interface board failure — incorrect relay outputs, erratic alarm behaviour, channel inputs not being processed correctly, or a complete control unit failure that has been traced to the interface PCB. You need the correct replacement board — the 44782-K183X in new or refurbished condition — sourced and delivered before the vessel’s next class survey or port departure. The full backward compatibility of the 44782-K183X means you do not need to determine the exact revision of the failed board before ordering, which matters when the replacement is being sourced urgently.
The Marine Equipment Service Engineer or Graviner Service Technician
You service Graviner MK6 control units on vessels at port and during drydocking periods. Interface board failure and degradation are among the more serious fault conditions you encounter on long-service MK6 installations — and having the 44782-K183X in your service stock means you can carry out the board replacement and reconfiguration during the same service visit, rather than requiring a return visit after the spare has been procured. The GL Selectable configuration on the 44782-K183X also means you can set the relay output behaviour during installation to match the vessel’s engine protection scheme without requiring a board swap to a different variant.
The Fleet Technical Superintendent Managing MK6 Control Unit Maintenance
You manage planned maintenance programmes for a fleet with Graviner MK6 installations of varying ages across multiple vessels. Interface PCB condition assessment is part of the deeper MK6 system reviews you carry out during drydocking — and for long-service installations, provisioning a 44782-K183X as a planned maintenance spare ensures that an interface board replacement can be executed immediately if the board is found to be approaching end-of-life during the drydock assessment, without extending the drydock period while waiting for the spare to be procured.
Possible Applications
- MK6 interface board replacement following control unit fault diagnosis — Direct replacement of a failed or degraded interface PCB identified as the root cause of MK6 control unit malfunction, alarm processing errors, or relay output failures
- Pre-survey MK6 control unit restoration — Interface board replacement carried out in advance of class renewal surveys or port state control inspections, ensuring the MK6 control unit is processing all detector head inputs and activating relay outputs correctly for the system functional test
- Drydock MK6 control unit overhaul — Interface board replacement as part of a comprehensive MK6 control unit maintenance programme during scheduled drydocking, updating the control unit to the latest revised interface board specification alongside other planned maintenance items
- MK6 control unit rebuild for new installation or system replacement — Interface board supply for MK6 control unit rebuilds on vessels undergoing OMD system replacement or upgrade, providing the latest revised board specification for the rebuilt control unit
- Vessel acquisition and MK6 system recommissioning — Interface board inspection and replacement as part of a full MK6 control unit condition assessment following vessel purchase or change of management, ensuring the control unit’s signal processing and relay output functions meet the new operator’s maintenance standard
- MK6 relay output configuration for specific engine protection schemes — GL Selectable interface board replacement used to reconfigure the MK6 system’s relay output behaviour when a vessel undergoes engine system modifications or when the existing relay output configuration is found to be incorrect for the installed engine protection scheme
- Marine equipment service company service stock — Held by authorised Graviner service agents as a core MK6 control unit spare for supply and installation during contracted MK6 service visits and drydock maintenance programmes
- Fleet spare parts provisioning — Maintained as a planned maintenance spare on fleet vessels with MK6 installations, ensuring interface board replacement can be carried out on demand without procurement lead time dependency during critical maintenance windows
Trust and Certifications
Kidde Graviner — OEM Manufacturer of the MK6 Oil Mist Detection System
Graviner, a Kidde brand, is the original equipment manufacturer of the MK6 oil mist detection system — the platform for which the 44782-K183X interface board is designed and specified. The interface PCB is one of the most functionally critical components in the MK6 control unit, directly responsible for the system’s alarm processing and relay output behaviour. Sourcing the replacement board under the Graviner OEM part number — 44782-K183X — provides the specification assurance that the component is the manufacturer’s own latest revised design, confirmed compatible with all MK6 control unit versions in service.
SOLAS Chapter II-1 — Crankcase Explosion Protection Signal Processing
The Graviner MK6 system’s compliance with SOLAS Chapter II-1 crankcase explosion protection requirements depends not just on the detector heads detecting oil mist, but on the interface PCB correctly processing those detector signals and activating the relay outputs that drive the engine’s protection response. An interface board that processes signals incorrectly or activates relay outputs unreliably is a control unit that cannot be trusted to deliver the protection response the SOLAS requirement exists to mandate. Replacing a failed interface board with the OEM-referenced 44782-K183X is the correct maintenance standard for restoring this compliance-critical function.
Classification Society Type Approval — Graviner MK6
The Graviner MK6 carries type approval from major classification societies including Lloyd’s Register, DNV, Bureau Veritas, ClassNK, and ABS — covering the complete system design, including the control unit’s interface PCB assembly. Using the OEM-referenced 44782-K183X as the replacement interface board maintains the MK6 control unit in its type-approved configuration — the standard against which class surveyors assess the system’s operational condition during periodic surveys of the vessel’s crankcase explosion protection equipment.
Dual PSU Visual Identification — Latest Revised Board Confirmation
The presence of two PSU units on the 44782-K183X board provides immediate visual confirmation that the component received is the latest revised interface board specification — not an older single-PSU board of an earlier generation. For marine engineers and service technicians receiving and fitting the replacement board, this visual check is a practical confirmation step that the correct latest revised component has been supplied and installed.
Supplied by Alright Engineering Solutions
The Graviner MK6 Interface PCB GL Selectable 44782-K183X is supplied through Alright Engineering Solutions Pte. Ltd., a Singapore-based authorised distributor of marine safety and gas detection equipment. New and refurbished condition stock is available subject to current inventory; contact our team to confirm availability, lead time, and delivery options for your vessel’s location and maintenance timeline.
Accessories and Variants
Graviner MK6 EEPROM — Part No. 44782-K182
When replacing the MK6 interface PCB, the EEPROM memory component 44782-K182 — which stores the MK6 system’s event log data — should also be assessed for replacement if it is approaching memory capacity. A combined interface board and EEPROM replacement during the same maintenance event avoids a near-term second maintenance intervention for EEPROM capacity. Alright Engineering Solutions can supply both components together for a combined control unit PCB maintenance procurement.
Graviner MK6 EPROM — Part No. P57100-113
The EPROM P57100-113, which carries the MK6 system firmware on the main PCB, should be confirmed as correct and functional as part of any interface board replacement — ensuring the firmware governing the system’s detection logic is consistent with the latest revised interface board specification installed.
Graviner MK6 Detector Head — Part No. E3561-301
For comprehensive MK6 system maintenance combining control unit PCB restoration with detector head replacement, the E3561-301 latest revised green label detector head can be procured alongside the 44782-K183X interface board — enabling a combined control unit and detector head maintenance procurement in a single order from Alright Engineering Solutions.
Graviner MK6 Commissioning Kit — Part No. D9221-026
Following interface PCB replacement and relay output reconfiguration, a full MK6 system commissioning using the D9221-026 commissioning kit confirms the control unit is processing detector head signals correctly and activating relay outputs at the correct alarm thresholds — providing the post-maintenance functional verification required for survey documentation.
Additional Graviner MK6 Spare Parts
Alright Engineering Solutions can assist with sourcing the complete range of Graviner MK6 system spare parts alongside the 44782-K183X interface board — EEPROM 44782-K182, EPROM P57100-113, LCD display 43785-K120, membrane function key front 39155-K047, junction box D4720-001-02, detector heads E3561-301, and commissioning kit D9221-026. Contact our team with your complete MK6 requirements for a combined availability check and quotation.
Get in Touch
If you need to source the Graviner MK6 Interface PCB GL Selectable 44782-K183X — for an immediate control unit fault repair, a pre-survey restoration, a drydock maintenance programme, or fleet spare parts provisioning — contact Alright Engineering Solutions to confirm current stock availability in new or refurbished condition and request a formal quotation.
Our team can assist with confirming the correct GL selectable relay output configuration for your vessel’s engine protection scheme, and can combine the interface board with other Graviner MK6 spare parts in a single procurement.
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