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Overview
The Graviner Mark 5 Oil Mist Detector operates on a straightforward but precision-dependent principle: it continuously samples the crankcase atmosphere and measures oil mist concentration using an optical detection circuit. At the heart of that circuit is the toroid — a small but functionally critical inductive component that plays a key role in the detector’s electrical signal processing. When the toroid degrades or fails, the detector’s ability to accurately measure and report oil mist concentration is compromised, and the entire crankcase protection system becomes unreliable. On a vessel where the MK-5 is the primary — and often the only — line of defence against crankcase oil mist explosions, a failed toroid is not a deferred maintenance item.
The Toroid for Graviner Mark 5 Oil Mist Detector (Part No. 44211-115) is a refurbished replacement toroid component for the Graviner MK-5 detector unit. Identified by the OEM part number 44211-115, this component restores the detector’s signal processing function to its original operating specification — returning a non-functional or degraded MK-5 detector to full operational status without replacement of the complete detector assembly.
What makes this the correct procurement choice is part number certainty. The 44211-115 designation is the OEM-referenced part number for this toroid within the Graviner Mark 5 product family. For ship engineers, technical superintendents, and marine procurement teams who need to restore a Mark 5 detector with documented component traceability — and who cannot afford to gamble on a dimensionally similar but electrically incorrect substitute — this refurbished OEM-referenced toroid provides both the functional restoration and the documentation confidence that crankcase safety system maintenance demands.
Key Features
OEM Part Number 44211-115 — Confirmed Compatibility with Graviner MK-5
The 44211-115 part number is the manufacturer’s own reference for this toroid within the Graviner Mark 5 detector platform. In a detection circuit where inductance values, core geometry, and winding characteristics are matched to the detector’s original signal processing design, an OEM-referenced replacement eliminates the risk of using a generic or dimensionally close substitute that introduces measurement errors or instability. For vessels where the MK-5 must meet its class-approved performance specification, confirmed OEM part number compatibility is the appropriate maintenance standard.
Critical Signal Processing Function
The toroid in the Graviner Mark 5 functions as an inductive element within the detector’s electrical measurement circuit — processing the signal that ultimately determines the oil mist concentration reading displayed and acted upon by the alarm system. The physical construction visible in this component — a wound toroidal core with multiple wire terminations — reflects its role as a precision electrical component, not a simple mechanical part. Replacing a degraded toroid with the correct OEM-referenced component restores the circuit’s designed electrical characteristics and, with them, the detector’s measurement accuracy.
Refurbished Condition — Inspected Before Supply
The toroid is supplied in refurbished condition, inspected for electrical integrity and physical condition before dispatch. For a component embedded within a crankcase safety detection circuit, an inspected refurbished part provides greater operational confidence than an untested used component sourced from decommissioned equipment. Refurbished availability is also the practical reality for MK-5 systems that are well into their operational lifespan — new OEM toroid stock for legacy detector variants is frequently discontinued, on extended lead time, or available only as part of a complete assembly at a cost that is disproportionate to a component-level repair.
Compact, Robust Construction for Detector Environment
The toroid is a compact wound component designed to fit within the constrained internal geometry of the MK-5 detector unit. Its construction must maintain electrical stability under the vibration, temperature variation, and oil mist exposure that characterises operation in proximity to a running marine diesel engine. The OEM design and materials specification ensures the component meets the environmental demands of the detector’s installed location without premature degradation of its electrical characteristics.
Supports Complete MK-5 Detector Overhaul and Component-Level Repair
For service engineers and ship repair facilities carrying out MK-5 detector overhauls, the availability of individual OEM-referenced components — including the toroid — enables component-level repair rather than complete detector replacement. A complete MK-5 detector replacement carries a significantly higher cost than a targeted component repair using OEM-referenced spare parts. For fleet operators managing maintenance costs across multiple vessels with numerous MK-5 detection points, component-level repair availability translates directly into measurable maintenance cost reduction.
Technical Specifications
Component: Toroid (Inductive Component)
Part Number: 44211-115
Compatible System: Graviner Mark 5 (MK-5) Oil Mist Detector
Manufacturer: Graviner (Kidde / Carrier Global)
Model: MK-5
Description: MK-5 Oil Mist Detector Toroid
Function: Inductive signal processing component within MK-5 detection circuit
Condition: Refurbished
Benefits
Restores MK-5 detector measurement accuracy at component cost, not unit replacement cost. A degraded toroid introduces errors into the detector’s measurement circuit — leading to inaccurate oil mist concentration readings, nuisance alarms, or missed alarm conditions. Replacing the toroid with the correct OEM-referenced component restores the circuit to its designed electrical specification at a fraction of the cost of a complete MK-5 detector unit replacement. For vessels with multiple detector points installed across main and auxiliary engines, the cost difference is substantial.
Eliminates the risk of an electrically mismatched substitute component. Generic or substitute toroids sourced without confirmed part number verification may appear dimensionally compatible but carry different inductance values or core characteristics that introduce systematic measurement errors. An OEM-referenced 44211-115 toroid is matched to the MK-5 circuit’s original design parameters — removing the risk of a component that fits physically but degrades detection performance electrically.
Keeps the MK-5 detector within its type-approved operational specification. Classification societies require that crankcase oil mist detection systems be maintained in full operational condition and to the manufacturer’s specification. A detector with a degraded or incorrectly substituted toroid may not perform to its type-approved alarm threshold accuracy — a condition that can be raised as a maintenance deficiency during class survey or port state control inspection. OEM-referenced component replacement maintains the detector’s compliance standing.
Supports planned maintenance and drydock overhaul programmes. For technical superintendents planning MK-5 detector overhauls during drydock or annual maintenance periods, the availability of individual OEM-referenced components — stocked in advance or sourced through a reliable specialist supplier — enables systematic detector servicing without operational delays caused by component procurement lead times.
Refurbished availability where new OEM stock is discontinued or slow to source. The Graviner Mark 5 is a mature product, and individual internal components like the toroid are frequently unavailable as new OEM stock through standard channels. Specialist marine safety equipment suppliers with access to refurbished OEM-referenced components provide the practical supply chain that keeps long-service MK-5 systems operational and maintained to standard.
Who It’s For
The Ship’s Chief Engineer Managing an MK-5 Detector Fault
The MK-5 detector on one of your main engine cylinders is logging a fault or producing erratic oil mist concentration readings that don’t correlate with crankcase conditions. Your in-house diagnostic has pointed to the detection circuit, and the toroid is identified as the suspect component. You need the correct OEM-referenced replacement — Part No. 44211-115 — sourced fast enough to restore the detector before the vessel’s next scheduled departure or upcoming class survey. You need a supplier who can confirm stock, provide the part with documented condition, and turn around the order within your operational timeline.
The Technical Superintendent Planning a Fleet MK-5 Overhaul
You manage planned maintenance across a fleet of vessels, several of which are equipped with Graviner Mark 5 detectors that are now 15 to 20 years into their service life. As part of your next drydock cycle, you want to carry out a systematic MK-5 component overhaul — replacing ageing internal components including toroids, photocell assemblies, and sampling tube fittings — to extend detector service life rather than absorbing the cost of complete unit replacements across the fleet. You need a reliable specialist supplier who can provide confirmed OEM-referenced MK-5 components in refurbished condition, in the quantities needed for a fleet overhaul programme, at commercially reasonable pricing.
The Marine Equipment Service Engineer
You carry out Graviner Mark 5 detector servicing and overhaul for vessel operators and ship management companies as part of a maintenance service contract. Toroid replacement is a routine element of a thorough MK-5 internal overhaul, and you need a consistent source of OEM-referenced 44211-115 toroids in refurbished condition to maintain your service stock and support your contract schedule. You need a supplier who understands the MK-5 component range, can confirm part number compatibility, and can provide the component documentation your service records require.
Possible Applications
- Bulk carriers and dry cargo vessels — Toroid replacement during planned maintenance or in response to detector fault conditions on vessels with medium-speed diesel main engines and MK-5 crankcase detection
- Tankers and chemical carriers — MK-5 component-level repair to maintain crankcase explosion risk management on vessels where engine room safety standards are subject to heightened regulatory scrutiny
- Container ships and ro-ro ferries — Internal component overhaul of MK-5 detectors during scheduled annual maintenance or port turnaround periods to maintain detection system reliability on high-utilisation vessels
- Offshore support vessels and PSVs — Emergency spare component sourcing for MK-5 detectors on offshore vessels operating in locations where standard OEM supply chains are not viable within the operational timeline
- Drydock and ship repair yards — Component-level MK-5 detector overhaul during class renewal surveys and scheduled drydocking as part of engine room safety system maintenance programmes
- Fleet spare parts provisioning — Advance stock procurement of MK-5 toroid components for ship management companies maintaining spare parts inventories across managed fleets to reduce emergency response lead times
- Marine electronics and safety equipment service contractors — Component sourcing for MK-5 detector overhaul, recertification, and repair contracts across Singapore and the regional market
Trust and Certifications
Graviner Mark 5 — Decades of Marine Crankcase Protection
The Graviner Mark 5 is the most widely installed crankcase oil mist detection system in the global marine fleet, with a service history spanning several decades and installations on vessels across all major vessel types and flag states. Developed by Graviner Ltd. and now maintained under the Kidde / Carrier Global 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. Maintaining the MK-5 with OEM-referenced components — including internally critical parts such as the toroid — preserves the detector’s type-approved performance specification and the vessel’s compliance with its class society’s crankcase detection requirements.
Refurbished and Inspected — Condition Assessed Before Supply
The toroid is supplied in refurbished condition, physically inspected and assessed before supply. For a precision electrical component within a crankcase safety detection circuit, documented condition assessment before supply provides the procurement assurance appropriate for a safety-critical maintenance item. The refurbished condition designation also reflects the practical reality of MK-5 spare parts availability — for mature detector variants, refurbished OEM-referenced components are frequently the most reliable and cost-effective maintenance option available.
Supplied by Alright Engineering Solutions
The Graviner Mark 5 Toroid (Part No. 44211-115) is supplied through Alright Engineering Solutions Pte. Ltd., a Singapore-based specialist supplier of marine safety and gas detection equipment and spare components. Alright Engineering Solutions supports vessel operators, ship management companies, and marine service contractors with spare parts sourcing, procurement assistance, and component availability enquiries for marine safety systems across Singapore and the regional market.
Accessories and Variants
Additional Graviner Mark 5 Internal Components
Alright Engineering Solutions can assist with sourcing additional Graviner Mark 5 internal spare components — photocell housings, photocell assemblies, detector heads, sampling tube fittings, alarm relay boards, and associated MK-5 system parts — for component-level overhaul programmes and fleet spare parts provisioning. Contact our team with your MK-5 component list and part references for availability and quotation.
Related Products
Graviner Mark 5 Photocell Housing (Part No. 45626-122) — Refurbished replacement photocell housing for MK-5 detectors requiring optical assembly enclosure replacement
Graviner Mark 5 Photocell Assembly — Complete photocell assembly for MK-5 detectors requiring full optical sensing assembly replacement
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 multi-gas monitor for confined space entry and atmosphere testing
RX-8700 Portable Gas Detector — ATEX/IECEx/MED-certified portable multi-gas monitor for marine applications
Get in Touch
If you need to source the Graviner Mark 5 Toroid (Part No. 44211-115) for a vessel repair, planned overhaul, or fleet spare parts programme — contact Alright Engineering Solutions to confirm availability and request a formal quotation.
Our team can also assist with sourcing a full list of Graviner Mark 5 internal spare components for complete detector overhaul programmes across single vessels or managed fleets.
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