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Overview
On any vessel where a Graviner Mark 5 Oil Mist Detector is installed, the photocell assembly is one of the most mechanically critical components in the detection system. The photocell housing — Part No. 45626-122 — is the structural enclosure that protects and correctly positions the optical photocell within the detector unit. Without a correctly fitted, undamaged housing, the photocell cannot maintain the precise optical alignment that the Mark 5 detector depends on for accurate oil mist concentration readings. A cracked, warped, or missing photocell housing directly compromises the reliability of the detection system and, by extension, the engine room’s primary line of defence against crankcase oil mist explosions.
The Graviner Mark 5 Photocell Housing (Part No. 45626-122) is a refurbished replacement housing component for the Graviner MK-5 Oil Mist Detector — the industry-standard crankcase oil mist detection system used aboard marine diesel engines worldwide. This component restores the mechanical integrity and optical alignment function of the photocell assembly, allowing the MK-5 detector to return to full operational status without replacement of the complete detector unit.
What makes this the correct choice for MK-5 maintenance is simple: part number specificity. The 45626-122 designation is the OEM-referenced part number for this exact housing variant within the Graviner Mark 5 product family. For vessel operators, ship engineers, and marine procurement teams who need to restore a Mark 5 detector to its original operating specification — and need confirmed component identity for spare parts documentation — this refurbished OEM-referenced housing provides both the physical fit and the documentary traceability that crankcase safety system maintenance requires.
Key Features
Direct Fit Compatibility with Graviner Mark 5 Oil Mist Detector
The 45626-122 housing is the OEM-referenced photocell housing for the Graviner MK-5 detector platform — the most widely deployed crankcase oil mist detection system in the marine diesel engine sector. Direct part number compatibility means the housing fits the Mark 5 detector assembly without modification, restoring the photocell enclosure to the original manufacturer’s specification. For vessels where the MK-5 detector is required to be operational for class survey or flag state inspection, confirmed OEM part number compatibility is the correct maintenance standard — not a generic or substitute component.
Precise Optical Alignment Protection
The photocell housing in the Graviner Mark 5 is not simply a protective cover — it is a precision-dimensioned enclosure that holds the photocell in the exact optical path required for accurate oil mist concentration measurement. Even minor dimensional deviations in a substitute housing can introduce optical misalignment, leading to inaccurate readings, false alarms, or — more critically — missed alarm conditions. The OEM-referenced 45626-122 housing maintains the design dimensions of the original component, preserving the detector’s measurement accuracy.
Refurbished Condition — Inspected and Tested
The component is supplied in refurbished condition, inspected for structural integrity and dimensional correctness before supply. For crankcase safety detection components where a functional failure can contribute to a crankcase explosion — one of the most serious risks in marine engine room operations — a tested, inspected refurbished component provides greater operational confidence than an untested used part of unknown condition. Refurbished availability also provides a practical and cost-effective solution for MK-5 systems that may be 15–25 years into their service life, where new OEM stock is on extended lead time or no longer catalogued.
Part No. 45626-122 — Unambiguous OEM Part Identification
The Graviner Mark 5 product family spans multiple detector variants, and component interchangeability between variants cannot be assumed without confirmed part number verification. The 45626-122 part number provides unambiguous OEM identification for this specific housing, reducing the risk of ordering an incorrect component when multiple housing variants exist across the MK-5 product range. For maintenance engineers and procurement teams working from the vessel’s Graviner spare parts documentation, this part number aligns directly with the manufacturer’s spare parts list reference.
Durable Engineering-Grade Construction
The photocell housing is constructed from engineering-grade material designed to withstand the temperature, vibration, and oil mist exposure conditions of an operating marine diesel crankcase environment. The housing must maintain its dimensional stability and mounting integrity across a wide range of operating conditions without cracking, warping, or loosening — conditions that would degrade photocell alignment and detector reliability over time.
Technical Specifications
Component: Photocell Housing
Part Number: 45626-122
Compatible System: Graviner Mark 5 (MK-5) Oil Mist Detector
Manufacturer: Graviner (Kidde / Carrier Global)
Model: MK-5
Description: MK-5 Oil Mist Detector Photocell Housing
Function: Photocell enclosure and optical alignment housing
Condition: Refurbished
Benefits
Restores MK-5 detector functionality without full unit replacement. A damaged or missing photocell housing can render the Graviner Mark 5 detector unreliable or non-functional. Replacing the housing with the correct OEM-referenced component restores detector integrity at a fraction of the cost of complete detector replacement — a meaningful difference for ship operators managing maintenance budgets on vessels with multiple MK-5 detector points installed across multiple engines.
Maintains optical measurement accuracy critical for reliable oil mist detection. The Mark 5 detector measures oil mist concentration by passing a light beam through the crankcase atmosphere and measuring the attenuation at the photocell. Housing integrity is directly linked to photocell alignment and, therefore, measurement accuracy. Replacing a damaged housing restores the optical path to the design specification — maintaining the alarm threshold accuracy that the MK-5 was type-approved to deliver.
Supports vessel crankcase safety compliance. Classification societies including Lloyd’s Register, DNV, Bureau Veritas, and others require that crankcase oil mist detection systems on marine diesel engines be maintained in fully operational condition. A non-functional or unreliable MK-5 detector due to a damaged photocell housing is a maintenance deficiency that can be raised during class survey or port state control inspection. Correct component replacement keeps the system within its operational and compliance status.
Refurbished availability where new OEM stock may be discontinued or slow to source. The Graviner Mark 5 is a long-service product, and for some MK-5 variants, new OEM spare components may be on extended lead time or discontinued. Refurbished OEM-referenced components sourced through specialist marine safety equipment suppliers provide a practical maintenance path that keeps the vessel’s crankcase detection system operational without waiting on extended OEM supply chains.
Confirmed part number eliminates ordering risk. Sourcing a photocell housing without confirming the correct part number introduces the risk of receiving a physically similar but dimensionally different component — one that may fit loosely, misalign the photocell, or fail prematurely. The 45626-122 part number provides the procurement confirmation needed before ordering, eliminating that risk.
Who It’s For
The Ship’s Chief Engineer or Marine Superintendent
You’re responsible for maintaining the Graviner Mark 5 oil mist detection system on a vessel with medium-speed or slow-speed diesel main engines. During a routine maintenance inspection or following a detector fault alarm, you’ve identified a damaged or missing photocell housing on one of the MK-5 detector units. You need the correct OEM-referenced replacement housing — with confirmed part number — sourced quickly enough to restore the detector to operational status before the vessel’s next class survey or before departure from port. You need a supplier who can confirm part number availability and provide documentation of the component’s refurbished and inspected condition for the vessel’s maintenance records.
The Marine Procurement Officer or Technical Superintendent
You manage spare parts procurement for a fleet of vessels equipped with Graviner Mark 5 oil mist detectors. Sourcing MK-5 spare components from the OEM is increasingly difficult — lead times are long, some parts are discontinued, and OEM pricing for legacy spare components can be disproportionate to the component’s replacement value. You’re looking for a reliable specialist supplier who can provide confirmed OEM-referenced refurbished MK-5 components — with correct part numbers — at commercially reasonable pricing and with lead times that fit the vessel’s operational schedule.
The Shipyard or Marine Equipment Service Engineer
You carry out Graviner Mark 5 detector servicing, overhaul, and recertification during drydock periods or as part of an annual maintenance contract. Photocell housings are a routine replacement component during MK-5 overhaul, and you need a reliable source for OEM-referenced 45626-122 housings in refurbished condition for your service stock — with enough supply consistency to support your service contract schedule across multiple vessels.
Possible Applications
- Bulk carriers and general cargo vessels — MK-5 detector maintenance on vessels with medium-speed diesel main engines where the Mark 5 is the installed crankcase detection system
- Container ships and ro-ro vessels — Photocell housing replacement during scheduled annual maintenance or in response to detector fault conditions identified during voyage
- Oil tankers and product tankers — MK-5 component maintenance on tanker vessels where crankcase explosion risk management is a key element of engine room safety management
- Offshore support vessels and platform supply vessels — Spare parts sourcing for Mark 5 detectors on offshore vessels operating in remote locations where OEM supply lead times are operationally problematic
- Drydock and ship repair facilities — Photocell housing replacement as part of planned MK-5 detector overhaul during scheduled drydocking and class renewal surveys
- Fleet spare parts provisioning — Stock component sourcing for ship management companies maintaining MK-5 spare parts inventories across managed fleets to reduce emergency procurement lead times
- Marine equipment service contractors — Component sourcing for Graviner Mark 5 service, overhaul, and calibration contracts on vessels with MK-5 installations across Singapore and the regional market
Trust and Certifications
Graviner Mark 5 — The Industry-Standard Marine Crankcase Oil Mist Detector
The Graviner Mark 5 Oil Mist Detector is the most widely installed crankcase oil mist detection system in the marine industry, with tens of thousands of units in service on vessels worldwide. Originally developed by Graviner Ltd. and now part of the Kidde / Carrier Global product portfolio, the MK-5 holds type approvals from all major classification societies — including Lloyd’s Register, DNV, Bureau Veritas, American Bureau of Shipping, and ClassNK — and has been the de facto standard for crankcase protection on marine diesel engines for several decades. Replacement components sourced with confirmed OEM part number references maintain the detector’s type-approved specification and the vessel’s compliance with its class society’s crankcase detection requirements.
Refurbished and Inspected — Functional Assessment Before Supply
The photocell housing is supplied in refurbished condition, inspected for structural integrity and dimensional correctness before supply. For crankcase safety detection components, where reliable operation is directly linked to engine room safety, an inspected refurbished component with documented condition provides appropriate assurance for vessel maintenance records and class survey documentation.
Supplied by Alright Engineering Solutions
The Graviner Mark 5 Photocell Housing (Part No. 45626-122) is supplied through Alright Engineering Solutions Pte. Ltd., a Singapore-based specialist in marine safety and gas detection equipment and spare parts. Alright Engineering Solutions supports vessel operators, ship management companies, and marine service contractors with component sourcing, availability enquiry, and procurement support for marine safety system spare parts across the Singapore and regional market.
Accessories and Variants
Additional Graviner Mark 5 Spare Components
Alright Engineering Solutions can assist with sourcing additional Graviner Mark 5 spare components — photocell assemblies, detector heads, sampling tubes, alarm relay boards, and associated MK-5 system spare parts — for vessel maintenance programmes and fleet spare parts provisioning. Contact our team with your Mark 5 component requirements and part references for availability enquiry and quotation.
Related Oil Mist Detection Products
Graviner Mark 5 Photocell Assembly — Complete photocell assembly replacement for MK-5 detectors requiring full optical assembly replacement beyond housing-only repair
Graviner Mark 5 Detector Head — Replacement detector head units for MK-5 crankcase oil mist detection systems
GX-8000 Sample Draw Multi Gas Monitor — Portable marine sample draw multi-gas monitor for vessel confined space entry and atmosphere testing
RX-8700 Portable Gas Detector — Portable multi-gas monitor with ATEX/IECEx/MED certification for marine applications
Get in Touch
If you need to source the Graviner Mark 5 Photocell Housing (Part No. 45626-122) for a vessel maintenance requirement — whether for an immediate repair, a drydock overhaul programme, or fleet spare parts stock — contact Alright Engineering Solutions to confirm availability and request a formal quotation.
Our team can also assist with sourcing additional Graviner Mark 5 spare components and related marine safety system parts for your vessel or fleet maintenance programme.
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