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Overview
The detector head is the sensing element of the entire Graviner MK6 oil mist detection system — the component that sits directly on the engine crankcase, draws in the crankcase atmosphere, and measures oil mist concentration in real time. Every other component in the MK6 system exists to support what the detector head does: detect the early build-up of oil mist that precedes a crankcase explosion and trigger the alarm that allows the engineering team to act before a catastrophic event occurs. When a detector head fails, degrades, or is found out of specification during a service visit, it is not a peripheral spare part that can be deferred — it is the primary detection element of a SOLAS-required safety system, and its replacement is a maintenance priority.
The Graviner MK6 Oil Mist Detector Head, Part No. E3561-301, is the latest revised detector head for the Kidde Graviner MK6 oil mist detection system. Identifiable by its green label — the visual marker that distinguishes the latest revised version from earlier MK6 detector head generations — the E3561-301 is fully interchangeable with any previous version of the Graviner MK6 OMD detector head. This full backward compatibility means the E3561-301 can be used as a direct drop-in replacement for any MK6 detector head currently installed, regardless of the age or revision of the detector being replaced.
The concrete differentiating factor of the E3561-301 over earlier MK6 detector head versions is precisely this combination: latest revised detection specification in a component that installs directly into any existing MK6 detector position without any system modification or compatibility investigation. For marine engineers and procurement teams replacing MK6 detector heads, this means the E3561-301 is the single correct replacement part for any MK6 installation — without the need to identify the exact previous detector revision before ordering.
Key Features
Latest Revised MK6 Detector Head — Green Label Identification
The E3561-301 is the latest revised generation of the Graviner MK6 detector head, identifiable by the green label around the detector body. The green label is the manufacturer’s own visual identifier for the latest revised specification — distinguishing the E3561-301 from earlier MK6 detector head versions that carry different label colours. When sourcing MK6 detector heads, confirming the green label specification ensures the component received is the current revised version, not an older stock item of an earlier generation. For vessels fitting the latest revised detector heads as a maintenance standard, the green label provides immediate visual confirmation of the correct component specification on delivery and after installation.
Full Interchangeability with All Previous MK6 Detector Head Versions
The E3561-301 is confirmed as fully interchangeable with any previous version of the Graviner MK6 OMD detector head. This full backward compatibility is the single most practically important specification for procurement teams and marine engineers sourcing MK6 detector head replacements: it means the E3561-301 is the correct replacement detector head for every MK6 installation currently in service, regardless of when the system was installed or which detector head revision is currently fitted. There is no need to identify the existing detector head revision before ordering — the E3561-301 replaces them all.
Direct Drop-In Replacement — No System Modification Required
The E3561-301 installs directly into the existing MK6 detector head mounting position on the engine crankcase — using the same mounting interface, cable connection, and installation procedure as all previous MK6 detector head versions. For marine engineers carrying out detector head replacement on board, a direct drop-in replacement is the component that minimises installation time, eliminates the risk of installation incompatibilities, and allows the MK6 system to be returned to full operational status as quickly as possible after the replacement is completed.
Primary Detection Element for Crankcase Explosion Prevention
The MK6 detector head continuously samples the crankcase atmosphere through its sampling tube, measuring the light obscuration caused by oil mist particles to determine oil mist concentration in the crankcase space. When oil mist concentration rises above the alarm threshold, the detector head signals the MK6 control unit, which initiates the alarm sequence. The quality and reliability of this detection is entirely dependent on the condition of the detector head — a detector head that is contaminated, mechanically degraded, or out of calibration will not provide reliable detection, regardless of how well the rest of the MK6 system is maintained.
Available in New and Refurbished Condition
The E3561-301 is available in both new and refurbished condition. New condition provides factory-specification detector heads for new MK6 installations, full system replacements, or planned maintenance programmes where new condition is the required standard. Refurbished condition — inspected, cleaned, and tested before supply — provides a cost-effective and often more rapidly available option for vessels replacing individual detector heads on long-service MK6 installations where the overall system is functioning correctly. Both conditions carry the green label latest revised specification; contact Alright Engineering Solutions to confirm current stock availability for each condition.
Technical Specifications
Manufacturer: Kidde Graviner
Part Number: E3561-301
Description: MK6 Oil Mist Detector Head — Latest Revised, Green Label
Compatible System: Graviner MK6 Oil Mist Detector
Compatibility: Fully interchangeable with all previous Graviner MK6 OMD detector head versions
Identification: Green label around detector body (latest revised version)
Detection Method: Light obscuration oil mist concentration measurement
Category: Oil Mist Detector — Primary Detection Component
Condition: New and Refurbished (both available)
Benefits
Restores reliable primary detection to the MK6 crankcase protection system. A degraded or failed detector head is a gap in the MK6 system’s detection coverage — a crankcase position that is no longer being monitored to the system’s designed detection standard. Replacing the detector head with the E3561-301 restores full detection coverage at that position, ensuring the MK6 system can detect and alarm on an oil mist event at every monitored crankcase point as intended.
Latest revised specification across the entire MK6 detector head population on board. As individual MK6 detector heads are replaced with the E3561-301 over time, the vessel’s MK6 installation progressively transitions to the latest revised detector head specification across all monitored positions. For chief engineers and fleet technical superintendents managing MK6 maintenance standards, this means each replacement cycle moves the system toward a consistent, current-specification detector head population — without requiring a full system replacement to achieve it.
No revision research required before ordering — the E3561-301 replaces all previous MK6 detector head versions. For procurement teams sourcing MK6 detector head replacements, the full backward compatibility of the E3561-301 eliminates the need to identify the exact detector head revision currently installed before placing an order. This simplification reduces procurement lead time and eliminates the risk of ordering an incorrect revision for a specific MK6 installation.
Supports MK6 system presentation for class survey and PSC inspection. Class surveyors and port state control officers assessing the Graviner MK6 system expect each detector head position to be equipped with a serviceable, functioning detector head. A system with failed or out-of-specification detector heads at one or more positions will not pass a functional inspection. Replacing failed detector heads with the OEM-referenced E3561-301 before survey ensures the system can be presented in full operational condition across all detector positions.
New and refurbished options provide procurement flexibility for different situations. Whether the requirement is a single detector head replacement for an immediate on-board fault, a batch replacement during drydocking, or a fleet spare parts stock build, both new and refurbished condition options are available — enabling procurement matched to the specific situation, timeline, and budget.
Who It’s For
The Chief Engineer Managing MK6 Detector Head Failures or Service Findings On Board
A detector head on your MK6 installation has been flagged as faulty during a service visit, or the MK6 control unit is showing a channel fault that has been traced to a specific detector head. You need the correct replacement detector head — the E3561-301 in new or refurbished condition — sourced and delivered in time to complete the replacement before the vessel sails or before the upcoming class survey. The full backward compatibility of the E3561-301 means you do not need to identify the exact revision of the failed detector head before ordering — it is the correct replacement regardless.
The Marine Equipment Service Engineer or Graviner Service Technician
You service Graviner MK6 systems regularly on vessels at port and during drydocking. Detector head condition assessment is a standard component of every MK6 service visit — and detector heads found to be contaminated, mechanically degraded, or out of specification during functional testing require replacement before the system can be returned to service. Having E3561-301 detector heads in your service stock — in both new and refurbished condition — means you can carry out detector head replacement during the same service visit, without requiring a follow-up visit after the spare has been procured.
The Fleet Technical Superintendent Managing Planned MK6 Detector Head Maintenance
You manage a fleet with Graviner MK6 installations that have been in service across a range of vessels for varying lengths of time. Detector head replacement is a predictable planned maintenance item on long-service MK6 installations — and batch detector head replacement during scheduled drydocking periods is the standard approach for fleet technical teams managing MK6 maintenance across multiple vessels. Provisioning E3561-301 detector heads as planned maintenance spares ensures the detector head replacement programme can be completed as scheduled, without procurement delays extending the drydock period.
Possible Applications
- Individual detector head replacement following service finding or channel fault — Replacement of a single MK6 detector head identified as faulty during a service visit or control unit channel fault diagnosis, restoring detection coverage at that crankcase position
- Batch detector head replacement during drydock planned maintenance — Systematic replacement of all MK6 detector heads across a vessel’s OMD installation during scheduled drydocking, transitioning the entire detector head population to the latest revised E3561-301 green label specification
- Pre-survey MK6 system restoration — Detector head replacement carried out in advance of class renewal surveys or port state control inspections, ensuring all MK6 detector positions are equipped with serviceable, functioning detector heads for the system functional test
- New MK6 system installation detector head supply — E3561-301 detector head supply for new Graviner MK6 installations on vessels under construction or undergoing OMD system installation, providing the latest revised detector specification from first installation
- MK6 system expansion — additional detector head positions — Detector head supply for MK6 system expansions where additional crankcase monitoring positions are being added, with the E3561-301 compatible with any existing MK6 installation regardless of the detector head revision currently installed at other positions
- Vessel acquisition and MK6 system recommissioning — Detector head inspection and replacement as part of a full MK6 condition assessment following vessel purchase or change of management, ensuring all detector positions meet the new operator’s maintenance standard
- Main engine and auxiliary engine crankcase OMD coverage — Detector head supply for both main propulsion engine and auxiliary machinery MK6 installations, with the E3561-301 applicable across all MK6 detector head positions regardless of engine type or size
- Marine spare parts distributors and MK6 service companies — Stocked as a primary Graviner MK6 spare part for supply to vessels, ship managers, and MK6 service and installation companies requiring E3561-301 detector heads at short notice
Trust and Certifications
Kidde Graviner — OEM Manufacturer With Decades of Marine OMD Experience
Graviner, a Kidde brand, has been at the forefront of marine crankcase explosion protection for decades — with MK6 and MK7 oil mist detector installations across thousands of commercial vessels in active service globally. The E3561-301 is the manufacturer’s own latest revised detector head for the MK6 platform — not a third-party alternative. For the primary detection element of a SOLAS-required safety system, OEM sourcing under the manufacturer’s part reference is the only appropriate maintenance standard.
SOLAS Chapter II-1 — Primary Detection Component for Crankcase Explosion Compliance
The Graviner MK6 oil mist detection system — and specifically its detector heads — is an accepted means of compliance with SOLAS Chapter II-1 crankcase explosion protection requirements for main propulsion engines above a specified bore. The detector head is the component that performs the actual detection function the SOLAS requirement exists to mandate. Maintaining all MK6 detector head positions with serviceable, OEM-referenced detector heads is the maintenance standard consistent with genuine SOLAS compliance — not just paper compliance.
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. Type approval covers the complete system, including its detector heads. Using the OEM-referenced E3561-301 detector head as the replacement component maintains the MK6 installation in its type-approved configuration — the standard against which class surveyors assess the system during periodic surveys of the vessel’s crankcase explosion protection equipment.
Green Label — Manufacturer’s Visual Identification of Latest Revised Specification
The green label on the E3561-301 detector head is Graviner’s own visual identifier for the latest revised MK6 detector head specification. For marine engineers receiving detector heads on board and fitting them to the engine, the green label provides immediate visual confirmation that the component installed is the current revised version — a simple but practically useful identification tool in a maintenance environment where multiple generations of the same component may be encountered across a long-service fleet.
Supplied by Alright Engineering Solutions
The Graviner MK6 Detector Head E3561-301 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; contact our team to confirm current availability, quantity requirements, and to discuss delivery options for your vessel’s location and maintenance schedule.
Accessories and Variants
Graviner MK6 Junction Box — Part No. D4720-001-02 (2-Input to 14-Input)
For MK6 installations where the detector head replacement is accompanied by a review of the system’s wiring infrastructure, the D4720-001-02 junction box — available in 2-input to 14-input configurations — provides the OEM connection enclosure for consolidating detector head cable connections at a single protected point. Alright Engineering Solutions can supply junction boxes alongside the E3561-301 detector heads for a combined detector and wiring infrastructure procurement.
Graviner MK6 Commissioning Kit — Part No. D9221-026
Following detector head replacement, a full MK6 system functional test and recommissioning using the D9221-026 commissioning kit confirms that the new detector heads are installed correctly and that the system is responding to oil mist concentration at the correct alarm threshold across all replaced positions — providing the post-maintenance functional verification required for survey documentation.
Graviner MK6 LCD Display — Part No. 43785-K120
For comprehensive MK6 system maintenance combining detector head replacement with control unit component restoration, the 43785-K120 latest revised LCD display can be procured alongside E3561-301 detector heads from Alright Engineering Solutions — enabling a combined detector and control unit maintenance procurement in a single order.
Additional Graviner MK6 Spare Parts
Alright Engineering Solutions can assist with sourcing the complete range of Graviner MK6 spare parts alongside the E3561-301 detector heads — EEPROM 44782-K182, EPROM P57100-113, membrane function key front 39155-K047, junction box D4720-001-02, 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 Detector Head E3561-301 — whether for an immediate replacement, a pre-survey restoration, a planned 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 also assist with sourcing additional Graviner MK6 system components and can combine the detector heads with other MK6 spare parts in a single procurement for your vessel or fleet maintenance requirement.
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