Environmental safety and regulatory compliance have become non-negotiable in modern marine operations. One essential piece of equipment that supports these goals is the Brannstrom BilgMon 488, a 15ppm bilge alarm system engineered to meet the strict standards of MARPOL Annex I and IMO Resolution MEPC.107(49). This compact and intelligent monitoring device plays a crucial role in ensuring that bilge water discharged overboard meets legal oil content limits, helping vessel operators stay compliant while protecting marine ecosystems.
Key Features at a Glance
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High-Accuracy Oil Content Monitoring
Detects oil concentrations in bilge water from 0 to 30 parts per million (ppm) with high precision, enabling accurate environmental reporting. -
Dual Power Options
Operates on 115/230 VAC or 24V AC/DC, making it adaptable for different vessel power configurations. -
Wireless Measuring Cell
The unique wireless detachable cell simplifies installation and maintenance, allowing for calibration and cleaning without dismantling the entire unit. -
Automatic Freshwater Flushing
Maintains sensor accuracy and extends service intervals with built-in auto-flush capability. -
User-Friendly Interface
A clear LCD screen and keypad provide real-time readings and access to historical data, which can also be exported via a USB port. -
Plug-and-Play Installation Kit
Comes complete with all necessary accessories—piping, connectors, and a 3-way valve—allowing for quick and straightforward onboard installation.
Installation & Operation
The BilgMon 488 is designed with the user in mind. Whether for retrofits or new installations, its small footprint and ready-to-install kit mean ship crew can typically have it operational in under an hour. Its modular, low-maintenance construction ensures that vessel downtime for service or repairs is minimal.
Battery and Data Considerations
An important operational note concerns the system’s internal battery. Earlier versions of the BilgMon 488 were fitted with non-replaceable batteries. Once these batteries reached the end of their life, some units began to display corrupted or scrambled data. This could result in failed inspections or non-compliance with international standards.
Later models have addressed this issue by incorporating replaceable batteries. Regardless of version, it’s crucial for operators to regularly verify battery condition and data integrity, ensuring that at least 18 months of records are safely stored and accessible for inspection.
Global Applicability
Due to its ease of use and regulatory compliance, the BilgMon 488 is a preferred bilge alarm system on vessels of all types—from commercial cargo ships to offshore platforms. It is supported by a wide network of service providers worldwide, ensuring that technical assistance, spare parts, and expertise are readily available wherever the vessel operates.
What’s in the Box?
The BilgMon 488 comes as a complete installation package:
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Main control unit with LCD display
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Detachable measuring cell
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3-way flushing valve
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Piping and connectors
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User manual and calibration certificate
This all-in-one packaging ensures the system is ready for fast installation without the need to source additional parts.
Built-In Calibration Support
The system supports both manual and automatic calibration. The wireless cell design allows crews to perform calibration easily without tools or complex procedures—minimizing operational interruptions.
Smart Monitoring and Alarm Features
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Multiple Alarm Levels: Visual and audible alarms are triggered when oil content exceeds preset limits.
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Fail-Safe Mode: In case of sensor malfunction, the system enters a fail-safe mode to prevent illegal discharge.
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Tamper-Proof Logs: Data logs are protected from unauthorized access, ensuring data integrity for audits and inspections.
Long-Term Data Logging
Stores up to 18 months of operational data including:
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Oil content levels
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Flow rates
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Alarm events
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Maintenance logs
This long-term storage supports regulatory inspections and internal audits.
Environmental and Operational Tolerance
Built to operate reliably in harsh maritime environments:
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Temperature range: -15°C to +55°C
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IP65-rated enclosure for water and dust resistance
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Shock and vibration-tested for marine conditions
Compliance at a Glance
Fully compliant with:
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IMO MEPC.107(49)
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MARPOL Annex I
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Classification society requirements (ABS, DNV, Lloyd’s Register, etc.)
This makes the BilgMon 488 universally acceptable across global fleets.
Retrofit-Friendly Design
Its modular setup and compact size make it ideal for:
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New vessel installations
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Retrofit projects on existing ships
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Quick replacements of outdated systems
Minimal Maintenance, Maximum Uptime
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Automatic freshwater flushing reduces sensor fouling
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Easy access to components for cleaning or replacement
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Designed to reduce false alarms and manual intervention
Integration with Oily Water Separator (OWS) Systems
The BilgMon 488 is engineered for seamless integration with most standard Oily Water Separator (OWS) systems. It provides real-time feedback to the separator, automatically halting discharge if oil levels exceed preset thresholds. This direct control loop enhances environmental safety and ensures immediate response to contamination, reducing the risk of accidental violations.
Final Thoughts
The Brannstrom BilgMon 488 is more than just a compliance tool—it’s a smart investment in operational integrity and environmental stewardship. Its accuracy, durability, and ease of maintenance make it a go-to solution for fleet managers and engineers seeking peace of mind in oily water separation compliance.
Whether you’re upgrading old systems or fitting out a new build, the BilgMon 488 offers the reliability and performance modern shipping demands