Title

Deckma OMD-21 Oil Content Meter | 15 PPM Bilge Alarm & Oil Monitoring Device | Marine Oily Water Separator Monitor | SM MARINE SERVICE™

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Description

Deckma OMD-21 Oil Content Meter

Intelligent 15 PPM Bilge Alarm & Oil Monitoring Device for Marine Pollution Prevention

The Deckma OMD-21 Oil Content Meter is a highly reliable 15 PPM Bilge Alarm (Oil Monitoring Device) designed to continuously measure the oil concentration in bilge water discharged from a ship's Oily Water Separator (OWS). Manufactured by Deckma Hamburg GmbH, Germany, the OMD-21 is one of the most widely installed oil monitoring systems onboard commercial vessels.

The unit continuously analyzes the oil content of treated bilge water before discharge overboard. If the oil concentration exceeds the IMO-approved limit of 15 ppm, the OMD-21 immediately activates visual and audible alarms and automatically stops overboard discharge or diverts the flow back to the bilge tank, preventing marine pollution and ensuring compliance with IMO MARPOL Annex I.

Its rugged construction, simple operation, and highly accurate optical measurement technology have made the Deckma OMD-21 a trusted standard throughout the global shipping industry.

SM MARINE SERVICE™ supplies new, used, and professionally reconditioned Deckma OMD-21 Oil Content Meters, including measuring cells, control units, display modules, PCB boards, spare parts, calibration services, repair, and worldwide technical support.

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Manufacturer Information

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What Is the Deckma OMD-21 Oil Content Meter?

The Deckma OMD-21 is an optical oil monitoring instrument installed downstream of a ship's Oily Water Separator (OWS). It continuously measures the oil concentration in treated bilge water before it is discharged overboard.

The measuring cell uses optical light-scattering technology to determine the amount of oil present in the water sample. If the measured oil concentration exceeds 15 ppm, the monitor immediately:

• Activates audible and visual alarms
• Stops overboard discharge
• Diverts water back to the bilge holding tank (depending on system configuration)
• Records alarm events for inspection and compliance

This automatic protection helps prevent accidental pollution and ensures that vessels comply with international environmental regulations.

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Key Features

The Deckma OMD-21 Oil Monitoring Device offers numerous advantages for marine environmental protection:

• Continuous oil content measurement
• High-accuracy optical detection technology
• 15 ppm alarm function
• Automatic overboard discharge control
• Compact stainless-steel enclosure
• Easy calibration procedure
• User-friendly display and keypad
• Self-diagnostic capability
• Low maintenance requirements
• Reliable long-term operation
• IMO and MARPOL compliant
• Suitable for all approved Oily Water Separator systems

Main Components of Deckma OMD-21 Oil Content Meter

The Deckma OMD-21 consists of several precision components that work together to ensure accurate oil content monitoring:

• Oil Measuring Cell
• Optical Sensor Assembly
• Sample Chamber
• LED Light Source
• Photodetector
• Electronic Control Unit
• LCD Display Module
• Alarm Output Circuit
• Automatic Cleaning System
• Calibration Adjustment Circuit
• Flow Monitoring Assembly
• Sample Water Inlet & Outlet
• Solenoid Valve Interface
• Relay Output Module
• Power Supply Board
• Communication Interface (depending on version)

These components provide continuous monitoring while maintaining compliance with IMO pollution regulations.

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Typical Technical Specifications

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Marine Applications

The Deckma OMD-21 is widely installed on:

• Cargo Ships
• Oil Tankers
• Chemical Tankers
• LNG & LPG Carriers
• Container Ships
• Bulk Carriers
• Offshore Support Vessels
• Passenger Ships
• Naval Vessels
• Research Ships
• Tug Boats
• Floating Power Plants

Its primary role is to ensure that only compliant treated bilge water is discharged overboard.

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Common Problems & Troubleshooting

Engineers may occasionally experience the following issues:

High Oil Alarm at Clean Water

• Dirty measuring cell
• Optical sensor contamination
• Incorrect calibration
• Air bubbles in sample line

No Display

• Power supply failure
• Internal fuse blown
• Display PCB fault

Continuous 15 PPM Alarm

• Oily Water Separator malfunction
• Measuring cell contamination
• Sampling flow interruption

Flow Alarm

• Blocked sample line
• Pump failure
• Closed valve

Unstable Reading

• Dirty optical window
• Electronic drift
• Excessive vibration
• Sample flow fluctuations

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Preventive Maintenance

For reliable long-term performance:

• Clean the measuring cell regularly.
• Inspect optical windows for contamination.
• Verify sample flow daily.
• Perform routine calibration using approved procedures.
• Inspect electrical connectors.
• Replace worn seals and O-rings.
• Check relay outputs and alarm functions.
• Keep the sample line free from sludge.
• Test automatic shutdown functions during maintenance.
• Maintain calibration records for inspections.

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Why Ships Continue Using Deckma OMD-21

Despite newer models entering the market, the OMD-21 remains popular because of:

• Excellent long-term reliability
• Simple operation
• High measurement accuracy
• Worldwide spare parts availability
• Easy maintenance
• Proven IMO compliance
• Strong global service support
• Low operating costs
• Long service life

Many vessels continue operating the Deckma OMD-21 for years with proper maintenance and periodic calibration.

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Frequently Asked Questions (FAQ)

Is the Deckma OMD-21 IMO approved?

Yes. It is designed to comply with IMO MARPOL Annex I and MEPC.107(49) requirements.

What does the 15 ppm alarm indicate?

It indicates that the oil concentration in the discharge water exceeds the legal discharge limit.

Can the measuring cell be repaired?

Yes. Many measuring cell components can be serviced or replaced depending on their condition.

Does the OMD-21 require calibration?

Yes. Regular calibration is essential to maintain accurate oil content measurements.

Are spare parts available?

Yes. SM MARINE SERVICE™ supplies measuring cells, optical sensors, display units, PCB boards, power supplies, seals, cables, connectors, and many other spare parts.

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Short Product Description

The Deckma OMD-21 Oil Content Meter is a trusted 15 PPM Bilge Alarm designed for continuous monitoring of oil concentration in treated bilge water discharged from marine Oily Water Separator systems. Using advanced optical measurement technology, it provides reliable environmental protection while ensuring compliance with international IMO regulations.

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User Manual & Technical Resources

Recommended technical documents include:

• Deckma OMD-21 Operating Manual
• Installation Manual
• Calibration Procedure
• Service Manual
• Spare Parts Catalogue
• IMO MEPC.107(49) Approval Documentation
• Wiring Diagram
• Maintenance Guide

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Why Choose SM MARINE SERVICE™

SM MARINE SERVICE™ supplies New, Used, and Professionally Reconditioned Deckma OMD-21 Oil Content Meters with worldwide technical support.

Our services include:

• Worldwide Supply
• Spare Parts Supply
• Measuring Cell Replacement
• Optical Sensor Replacement
• PCB Board Supply
• Repair Services
• Calibration Services
• Functional Testing
• Technical Consultation
• Fast Worldwide Shipping

Bangladesh Office
Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh

China Warehouse & Support Center
Shanghai, China

Website: www.smmarineservice.com
Email: info@smmarineservice.com
WhatsApp: +8801818929292
Marketing Contact: Nazmul Hasan Bhuiyan

 

 

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