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Overview
Maintaining MARPOL compliance at sea is one of the chief engineer’s most consequential responsibilities. A 15ppm bilge alarm is not optional equipment — it is the technical mechanism through which MARPOL Annex I Regulation 14 is enforced onboard, and its accuracy and reliability directly determine whether the vessel discharges within the legal limit or exposes the owner, operator, and crew to flag state penalties, PSC detention, and in serious cases, criminal prosecution. The challenge is that engine room bilge water is not clean water — it contains emulsified oils, suspended solids, and cleaning agents that confuse less capable instruments and generate false alarms or, worse, false clearances.
The Deckma Hamburg OMD-2005 is a purpose-engineered 15ppm bilge alarm monitor designed by Deckma Hamburg GmbH specifically for use in conjunction with oily water separator systems on MARPOL-applicable vessels. Deckma Hamburg GmbH is a German manufacturer with a longstanding reputation in marine oil content monitoring — the OMD product line has been trusted by ship operators, class societies, and flag states across the global fleet for decades. The OMD-2005 reflects the engineering focus that has made Deckma a reference name in bilge alarm technology: straightforward operation, robust construction, and performance specifications that meet the IMO standard without complexity that adds maintenance burden.
The concrete differentiator that sets the OMD-2005 apart from competing 15ppm bilge alarms is its built-in solids suppression capability. In real engine room conditions, bilge water routinely contains suspended particulates — rust particles, scale, and sediment — that register as false positives on instruments without suppression capability, triggering nuisance alarms and interrupting bilge pumping operations. The OMD-2005’s solids suppression functionality filters out this particulate interference, providing oil content readings that reflect actual dissolved and emulsified oil concentration rather than total optical interference — a practical operational advantage that reduces false alarm frequency and maintains crew confidence in the system’s readings.
Key Features
Solids Suppression Capability
The OMD-2005 incorporates active solids suppression — a signal processing function that distinguishes between optical interference caused by suspended solid particles and actual oil content in the measured water sample. Engine room bilge water in commercial vessel operation routinely contains rust particles, scale fragments, and sediment that would trigger false alarms on instruments without this capability. The solids suppression function ensures that alarm events correspond to genuine oil content exceedances rather than particulate contamination — maintaining the operational credibility of the alarm system and reducing unnecessary interruptions to bilge management operations.
Quick Response — Within 5 Seconds
The OMD-2005 responds to changes in oil concentration within 5 seconds of the sample entering the measurement cell. In practical operation, this means that oil breakthrough from the oily water separator triggers an alarm and initiates shut-off of the overboard discharge valve before a meaningful volume of non-compliant water can be discharged. MEPC.107(49) defines maximum permissible response times for type approval; the OMD-2005’s 5-second response meets this requirement and provides the rapid intervention capability that is the fundamental operational purpose of the bilge alarm system.
Data Logger — 18-Month Operating History
The OMD-2005 includes an integrated data logger with a minimum 18-month recording capacity for operating history — storing ppm readings, alarm events, and system status over the full period between drydock service intervals and beyond. This data logging capability directly supports the Oil Record Book requirements of MARPOL Annex I, providing an independent electronic record of bilge alarm operation that PSC inspectors and class surveyors can verify against the vessel’s ORB entries. For vessels subject to PSC inspection in Tokyo MOU or Paris MOU ports, the ability to produce an 18-month instrument history on demand is a practical compliance asset that paper records alone cannot fully provide.
Automatic Voltage Selection
The OMD-2005 features automatic voltage selection, accepting a range of supply voltages without manual configuration. This removes a practical installation complication on vessels with non-standard electrical supply arrangements — a common situation on older vessels, converted vessels, or vessels with mixed electrical systems from multiple build periods. Automatic voltage selection also simplifies the installation process for yard technicians and reduces the risk of supply voltage mismatch errors during installation or after electrical maintenance.
Output Signal for External Recorder / Meter
The OMD-2005 provides an output signal suitable for driving an external recorder or meter — allowing the ppm reading to be fed to an integrated vessel monitoring system, a bridge display, or a standalone recorder as required by the vessel’s monitoring and recording setup. This output capability supports integration with the vessel’s existing automation and alarm management infrastructure, and provides an additional pathway for maintaining the continuous ppm record that MARPOL compliance requires.
Compact Design — 7.3 kg
The OMD-2005 weighs 7.3 kg — a genuinely compact and lightweight unit for a bilge alarm monitor of its capability. Engine rooms on commercial vessels present real installation space constraints, and equipment weight and footprint are practical factors in placement decisions. The compact form factor simplifies panel mounting, reduces structural loading considerations for bulkhead-mounted installations, and eases handling during installation and maintenance — a consideration that matters to the engine room team responsible for maintaining the equipment over the vessel’s service life.
Low Maintenance and Easy Installation
The OMD-2005 is designed around a low-maintenance philosophy — minimising the frequency and complexity of service interventions required to keep the instrument in operational and type-approved condition. Simple installation procedures reduce commissioning time at drydock or during new installation, and the straightforward operational interface reduces the training requirement for engineering staff who may be encountering the instrument for the first time. In a commercial vessel operation where engineering manpower is finite and drydock time is expensive, an instrument that can be installed and returned to service efficiently has a direct operational value.
Robust Construction
The OMD-2005 is built for the physical demands of continuous service in a commercial vessel engine room — an environment characterised by vibration, humidity, temperature variation, and the chemical exposure that comes with proximity to bilge water, fuel, and lubricating oil. Robust construction is not a marketing description for Deckma equipment; it is a design requirement for an instrument that must remain in calibrated, operational condition through ocean voyages and variable operating conditions without the opportunity for immediate specialist service intervention.
Technical Specifications
Model: OMD-2005
Manufacturer: Deckma Hamburg GmbH, Germany
Function: 15ppm bilge alarm monitor for oily water separator systems
Compliance Standard: IMO Resolution MEPC.107(49)
Response Time: Within 5 seconds
Alarm Threshold: 15 ppm (automatic alarm and overboard shut-off)
Display: Digital ppm readout with indicator panel (Oil, Alarm, Status)
Data Logger: Minimum 18 months operating history
Output Signal: Available for external recorder / meter
Power Supply: Automatic voltage selection
Weight: 7.3 kg
Special Capability: Solids suppression
Country of Manufacture: Germany
Benefits
For the chief engineer, the most immediate benefit of the OMD-2005 is operational confidence in the bilge alarm readings. The solids suppression capability means that alarm activations correspond to actual oil content exceedances — not particulate interference — so when the alarm triggers, the duty engineer knows it requires a response. In vessels without solids suppression, repeat nuisance alarms erode crew confidence in the system over time, creating the conditions under which alarms may be silenced or disregarded. The OMD-2005 removes this risk by ensuring alarm events are meaningful.
The 18-month data logger is a compliance asset that extends beyond the instrument itself. During PSC inspections, the ability to produce an independent electronic record of bilge alarm operation — corroborating the Oil Record Book entries — demonstrates a standard of MARPOL compliance management that reduces PSC inspector scrutiny and supports a faster, lower-risk inspection outcome. For vessel managers dealing with PSC-intensive trading routes, this documentation capability has a measurable risk management value.
The low-maintenance design philosophy translates directly into reduced total cost of ownership over the instrument’s service life. Fewer service interventions mean lower maintenance costs, less drydock time allocated to bilge alarm servicing, and reduced risk of the instrument being out of service during a critical period. For fleet managers managing maintenance budgets across multiple vessels, specifying equipment with a demonstrated low-maintenance track record is a sound procurement decision.
From a compliance documentation perspective, the OMD-2005’s MEPC.107(49) type approval provides the regulatory foundation that flag state surveyors, class society surveyors, and PSC inspectors require. Vessels fitted with type-approved equipment from a recognised manufacturer enter every survey and inspection with the equipment compliance question answered — removing one of the most common sources of survey findings related to pollution prevention equipment.
Who It’s For
Chief Engineers on Vessels with Active PSC Inspection Exposure
A chief engineer on a bulk carrier trading between Asian and European ports faces PSC inspections at multiple port calls per voyage under both the Tokyo MOU and Paris MOU regimes. Bilge alarm functionality is a standard PSC inspection item — inspectors check type approval documentation, test alarm response, and cross-reference instrument records against the Oil Record Book. For a chief engineer in this operating environment, the OMD-2005’s type approval credentials, 18-month data logger, and reliable alarm performance provide a defensible compliance position at every port inspection without requiring additional documentation effort.
Technical Superintendents Managing Fleet MARPOL Compliance
A technical superintendent responsible for MARPOL compliance across a managed fleet of general cargo vessels needs bilge alarm equipment that is consistent, documentable, and serviceable across the ports and drydocks where vessels are maintained. The OMD-2005’s established Deckma Hamburg pedigree, availability of type approval documentation, and low-maintenance design make it a practical choice for fleet standardisation — particularly for superintendents managing older vessels where bilge alarm equipment may be due for replacement during the next drydock and a direct replacement with a current type-approved unit is the cleanest compliance solution.
Marine Equipment Procurement Teams and Ship Chandlers
For a procurement officer sourcing bilge alarm equipment for a vessel refit on a defined budget and timeline, the OMD-2005 represents a well-credentialled choice with clear type approval documentation and manufacturer support from an established German OEM. Procurement teams sourcing MARPOL compliance equipment need to be able to demonstrate due diligence in equipment selection — specifying a Deckma Hamburg unit with MEPC.107(49) type approval provides the documentation trail that supports procurement accountability and simplifies the approval process for technical superintendents and flag state compliance officers reviewing the specification.
Possible Applications
Bulk Carriers on Long Ocean Passages
Bulk carriers accumulate significant bilge water volumes over extended ocean passages, and bilge pumping operations are a regular engine room task. On vessels trading between Asia, Europe, and the Americas, the OMD-2005’s continuous monitoring and 18-month data logger support MARPOL compliance documentation across the full span of trading voyages between drydock surveys.
General Cargo Vessels and Container Feeders
General cargo and container feeder vessels typically operate on high-frequency port rotation schedules — multiple port calls per week in some trades — increasing the frequency of PSC inspection exposure. The OMD-2005’s fast response, reliable alarm performance, and data logging capability support clean PSC inspection outcomes on vessels where inspection frequency is high and deficiency records have a direct commercial impact on port access.
Tankers and Chemical Carriers
Tanker operators face the most scrutinised MARPOL compliance environment in commercial shipping. Vetting inspections (SIRE, CDI) conducted by major oil company charterers include detailed review of bilge alarm equipment status, type approval documentation, and operational records. The OMD-2005’s credentials support the equipment documentation requirements of oil major vetting without requiring additional preparation beyond standard maintenance records.
Offshore Support Vessels
OSVs operating in support of offshore oil and gas production typically face environmental discharge requirements that are at least as stringent as MARPOL and in many offshore areas more restrictive. The OMD-2005’s 15ppm monitoring capability provides the compliance baseline for overboard discharge in international waters, and its output signal capability allows integration with the vessel’s monitoring systems for the continuous ppm recording that offshore field operators increasingly require.
Ro-Ro Vessels and Car Carriers
Ro-Ro and car carrier vessels generate bilge water with characteristics influenced by vehicle washing runoff, fuel residues from cargo deck drainage, and the variety of contaminants associated with vehicle freight. The OMD-2005’s solids suppression capability is particularly relevant in these applications, where bilge water composition is more variable and particulate loading is typically higher than in conventional cargo vessel bilge systems.
Vessel Drydock Refits — Bilge Alarm Replacement During Survey
Drydock periods are the primary opportunity for bilge alarm replacement on vessels where existing equipment is approaching end of service life, has lost type approval status, or has accumulated a maintenance history that makes continued operation a compliance risk. The OMD-2005’s straightforward installation process, automatic voltage selection, and comprehensive type approval documentation make it well suited for drydock replacement — minimising installation time and supporting class and flag state approval of the new installation during the survey process.
Newbuild Vessel Specifications
Shipyards specifying bilge alarm equipment for newbuild vessels require units with current MEPC.107(49) type approval as a condition of flag state, class, and owner approval. The OMD-2005’s type approval credentials and Deckma Hamburg’s established position as a marine oil content monitoring manufacturer make it a credible newbuild specification choice — particularly for European-built vessels or vessels flagged under European maritime administrations where German engineering standards carry recognised weight.
Trust & Certifications
IMO Resolution MEPC.107(49) — Mandatory Type Approval Standard
MEPC.107(49) is the IMO performance standard that defines the measurement accuracy, response time, alarm behaviour, automatic shut-off requirements, and environmental test conditions that a 15ppm bilge alarm must meet to be approved for use on MARPOL-applicable vessels. Type approval to this standard is issued by a recognised flag state authority or classification society following independent testing of the instrument against the standard’s requirements. The OMD-2005 meets MEPC.107(49) requirements — providing the type approval foundation that PSC inspectors and class surveyors verify as part of MARPOL compliance inspections. Vessels fitted with equipment lacking current type approval face immediate compliance findings.
MARPOL Annex I — Regulation 14 Compliance Support
MARPOL Annex I Regulation 14 prohibits the overboard discharge of bilge water with oil content exceeding 15 parts per million from vessels operating outside special areas, and places the enforcement responsibility on the bilge alarm system and the duty engineer. The OMD-2005 enforces this limit through real-time monitoring and automatic shut-off — providing the technical compliance mechanism that MARPOL Annex I requires and that flag states and PSC regimes verify during inspections.
Deckma Hamburg GmbH — German Marine Oil Content Monitoring Specialist
Deckma Hamburg GmbH is a German manufacturer with a focused specialisation in marine oil content monitoring equipment. The OMD product line has established a long track record in the international fleet across multiple product generations, and Deckma Hamburg’s name is familiar to class surveyors, flag state inspectors, and marine engineers who have worked with the equipment across a range of vessel types. For procurement teams and technical superintendents evaluating bilge alarm options, Deckma Hamburg’s manufacturer credentials and the OMD-2005’s service history in the field provide a level of equipment confidence that newer or less specialised manufacturers cannot offer.
Classification Society Survey Compatibility
The major classification societies — Lloyd’s Register, Bureau Veritas, DNV, ClassNK, ABS, and others — require MEPC.107(49) type-approved bilge alarm equipment as part of their pollution prevention survey requirements. The OMD-2005’s type approval status and Deckma Hamburg’s established position in the classification society approval process support a straightforward survey experience without the documentation complications that arise from non-type-approved or poorly supported equipment installations.
Oil Record Book Documentation Support
MARPOL Annex I requires vessels to maintain an Oil Record Book recording all bilge water operations, including OWS usage, overboard discharge events, and bilge alarm activations. The OMD-2005’s 18-month data logger provides an independent electronic corroboration of these entries — supporting the accuracy and completeness of the ORB record that PSC inspectors review. Discrepancies between ORB entries and instrument records are one of the most common triggers for deeper PSC investigation of MARPOL compliance; the OMD-2005’s data logging capability reduces this risk by ensuring the instrument record is available and consistent.
Accessories & Variants
Compatible OWS Systems
The OMD-2005 is designed for use in conjunction with 15ppm oily water separator systems. It operates with the standard OWS configurations found across commercial vessel engine rooms — the bilge alarm monitors the separator output and controls the overboard discharge valve based on measured oil content. Vessels requiring a complete OWS and bilge alarm system can inquire about compatible separator units and the full system configuration appropriate for their vessel type and bilge water volumes.
Related MARPOL Compliance Products
Oil Record Book (MARPOL ORB Part I) — Required under MARPOL Annex I Regulation 17 for recording all bilge water management operations. An essential compliance companion for any vessel operating the OMD-2005.
External Recorder / Data Logger Interface — The OMD-2005’s output signal capability supports connection to an external recorder for bridge display or integrated alarm management system integration. Contact us to discuss interface options for your vessel’s monitoring system.
OWS Service Kits and Spare Parts — Consumables and service components for oily water separator maintenance, supporting the complete bilge treatment system that the OMD-2005 monitors.
Product Variants
OMD-2005 — Standard 15ppm bilge alarm monitor for MARPOL Annex I compliance. Suitable for use with oily water separator systems on vessels of all types where MEPC.107(49) type approval is required.
Deckma Hamburg OMD Range — Deckma Hamburg produces bilge alarm and oil content monitoring equipment across a range of models for different vessel sizes and OWS configurations. Contact us to discuss model selection if your vessel’s bilge system configuration requires review against the OMD-2005 standard specification.
Get in Touch
If you are sourcing a 15ppm bilge alarm for a vessel drydock, a planned refit, or a replacement installation — or if you need to verify type approval documentation for an upcoming PSC inspection or class survey — contact us to discuss the Deckma Hamburg OMD-2005 and confirm the correct specification for your vessel and OWS system.
Our team can assist with MEPC.107(49) type approval documentation, installation guidance for your OWS configuration, and supply timelines for vessels calling at Singapore or requiring regional delivery.
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