The Deckma OMD-11 is a high-precision 15 ppm bilge alarm monitor designed to improve the reliability and operation of oily water separator (OWS) systems. Meeting the requirements of IMO Resolution MEPC.60(33), the OMD-11 utilizes advanced solids suppression technology to distinguish between oil particles, solid particles, and water turbidity. Key Technical Specifications
The OMD-11 is a compact, lightweight unit (3.5 kg) built for the harsh environments of a ship's engine room. Specification Measuring Range 0 – 30 ppm (Trend indication up to 50 ppm) Accuracy Better than ± 5 ppm (per IMO requirements) Alarm Set Points Factory set at 15 ppm; adjustable from 2 to 15 ppm Power Supply 24V AC/DC ± 15% Output Signal 0(4) – 20 mA, selectable Protection Class Sample Flow Approx. 0.5 – 4 L/min (pressure dependent) Installation Guidelines
Proper installation is critical to ensure the monitor's response time remains within the 20-second limit mandated by IMO regulations.
Location: Mount the OMD-11 as close to the oily water separator as possible, typically within 8 meters.
Mounting: Use a rigid vertical surface. Ensure enough clearance on all sides for maintenance.
Piping: Use R 1/4" female pipe connections. It is recommended to use copper or stainless steel pipes (10 mm OD) to avoid corrosion.
Sample Point: The tapping should be on a vertical section of the discharge line to prevent air bubbles from interfering with the optical sensor. Operation & Calibration
The OMD-11 features 14-segment LEDs and simple push-button controls for on-site adjustments. OMD-11 Oil-in-Water Monitor Manual | PDF | Relay - Scribd
The Deckma OMD-11 is a 15 ppm bilge alarm monitor designed to accurately measure oil content in water, primarily for maritime use with oily water separators. While it is an older model replaced by newer units like the OMD-24 or OMD-2008, it remains widely used and fully supported for calibration and repairs. Core Capabilities
Measurement Accuracy: It monitors oil content from 0 to 30 ppm, with a trend indication extending up to 50 ppm. IMO Compliance
: The unit is designed to meet International Maritime Organization (IMO) resolution MEPC.60 (33) standards. Advanced Solids Suppression: A standout feature of the
is its ability to distinguish between actual oil particles and solids or water turbidity. This significantly reduces false alarms caused by non-oil contaminants like black iron oxide.
Dual Alarms: Features two independent alarm circuits, factory-set at 15 ppm but adjustable between 2 and 15 ppm. Technical Specifications Power Supply 24V AC/DC (standard) Output Signal 0(4) - 20 mA for external recorders or meters Protection Class IP 65 (watertight alloy enclosure) Sample Temp +1°C to +60°C Dimensions 175 x 190 x 220 mm; Weight: 3.5 kg Installation & Maintenance Highlights
Proximity: The manual mandates installing the monitor as close as possible to the oily water separator. The distance must not exceed 8 metres to ensure a response time under 20 seconds, as required by IMO regulations.
Calibration: The "Zero" point can be re-adjusted on-site using clean water via front panel buttons. However, full calibration must be performed by the manufacturer or an authorized provider like Mackay Marine during IOPP certificate renewals. deckma omd11 manual
Serviceability: The unit uses plug-in technology for its optical components and circuit boards, making component replacement relatively straightforward.
For full operational details and wiring diagrams, you can refer to the Instruction Manual via Scribd or Yumpu.
Deckma OMD-11 is an oil-in-water monitor designed by Deckma Hamburg GmbH
to meet international maritime standards for 15 ppm bilge alarms, specifically IMO Resolution MEPC.60 (33)
. Although now considered an older model and no longer in production, it remains widely supported for calibration and spare parts. Technical Specifications
utilizes light-scattering technology to distinguish between oil particles, solids, and water turbidity : 0–30 ppm (with trend indication up to 50 ppm). : Meets IMO MEPC.60 (33) standards.
: Two independent circuits, factory-set at 15 ppm (adjustable from 2–15 ppm). Power Supply
: 24V AC/DC standard; other voltages available upon request. : IP 65 protection rating. : Approximately 3.5 kg. Installation Guidelines According to the OMD-11 manual , proper mounting is critical for regulatory compliance: : The monitor must be located within
of the oily water separator. Distances beyond this may exceed the 20-second response time mandated by IMO regulations.
: Use 10 mm OD copper or stainless steel pipe. Sampling points should be on vertical pipe sections to minimize air entrainment.
: Fix the unit to a rigid vertical surface using 4 x M5 screws, preferably at eye level. Maintenance and Calibration
To ensure consistent accuracy, operators should follow a routine maintenance schedule: OMD-11 Oil-in-Water Monitor Manual | PDF | Relay - Scribd
Here’s a forum-style post you could use for a maritime or engineering community (e.g., on Reddit’s r/maritime, r/engineers, or a marine tech forum):
Title: Looking for Deckma OMD-11 Manual – Bilge Alarm Calibration Help The Deckma OMD-11 is a high-precision 15 ppm
Body:
Hey everyone,
I’m currently working with a Deckma OMD-11 oil content monitor (bilge alarm) and need the original manual (preferably the installation/calibration/maintenance section). We’re having intermittent issues with the 15 ppm alarm threshold drifting during warm-up.
I’ve found a few basic operation sheets online, but nothing with the full service parameters, zeroing procedure, or part numbers for the cleaning kit.
Does anyone have a PDF copy of the official Deckma Hamburg OMD-11 manual they could share? Alternatively, if you know the specific steps for a manual zero calibration after cleaning the measuring cell, that would be a lifesaver.
Cheers in advance.
(For reference: unit is installed on a 2017-built bulk carrier, software version 2.1. We’re MEPC 107(49) compliant, but just doing regular maintenance.)
Deckma Hamburg OMD-11 is an older oil-in-water monitoring unit designed for use with 15 ppm oily water separator systems. While no longer in active production, it remains fully supported for maintenance and calibration. Shivtech Marine Control Systems & Services Official Manuals & Resources Complete Instruction Manual (Scribd): A detailed OMD-11 Instruction Manual
is available, covering installation, wiring, and technical specifications. Operational Guide (Yumpu): An interactive Instruction Manual
provides details on the 15 ppm alarm settings and IMO resolution compliance. Technical Datasheet: A technical overview and parts list can be found at Mackay Marine Key Technical Specifications Measurement Range 0 – 30 ppm (Trend indication up to 50 ppm) Meets IMO Resolution MEPC.60 (33) requirements Alarm Points
2 independent alarms, factory set at 15 ppm (Adjustable 2–15 ppm) Power Supply 24V AC/DC (Standard) Output Signal 0(4) – 20 mA selectable Protection Class Operating & Maintenance Tips Calibration:
IMO regulations require periodic calibration checks. You can contact certified providers like Mackay Marine for on-site service or exchange units. Installation:
The unit should be mounted on a rigid vertical surface, ideally at eye level, close to the oily water separator to minimize response delays.
Deckma OMD-11 is a legacy bilge alarm unit designed to monitor oil-in-water concentrations in marine environments, specifically to ensure compliance with IMO Resolution MEPC.60(33) standards. Core Function & Features
The OMD-11 uses a light-scattering measurement principle to detect oil droplets in a sample stream. Key technical highlights from the Solids Suppression Title: Looking for Deckma OMD-11 Manual – Bilge
: Designed to minimize false readings caused by non-oil contaminants like iron oxide, showing only 2 ppm for substances that older monitors might misread as 15 ppm. Dual Alarms
: Features two independent alarm circuits factory-set to 15 ppm, though they are field-adjustable between 2 and 15 ppm via front-panel buttons. Output Signals
: Provides a 0(4)–20 mA signal for external recording or remote metering. Compact Build
: The unit is IP 65 rated for protection against water jets and dust, measuring approximately Technical Specifications Specification Measurement Range 0 – 30 ppm (Trend indication up to 50 ppm) plus or minus 5 ppm around the 15 ppm threshold per IMO standards Power Supply 24V AC/DC (standard); other voltages available on request Sample Temperature Operates between positive 1 raised to the composed with power 60 raised to the composed with power Response Time Adjustable alarm delays between 2 and 20 seconds Operational Guidelines Installation
: The unit should be mounted near the oily-water separator to minimize lag time. It requires a clean water source for flushing and mm OD piping for sample connections. Maintenance : Regular cleaning of the measuring cell is critical. The instruction manual
recommends using a dedicated cell cleaning brush and keeping spare desiccators and O-rings on hand. Calibration Check
: Proper function is verified using a Formazin polymer reference standard (typically 4000 FTU diluted to specific requirements) to ensure the monitor remains within the required accuracy limits. Shivtech Marine Control Systems & Services calibration kit contents INSTRUCTION MANUAL DECKMA HAMBURG Gmbh - YUMPU
This is where ignoring the manual leads to catastrophic false alarms or, worse, failure to detect an actual crankcase explosion.
The last chapter of the Deckma OMD-11 manual (Section 8.0) provides a checklist. Adhere to this to maintain class certification.
Daily (by Watch Engineer):
Monthly:
Annually (Docking Survey):
Spare parts that must be onboard (per class rules):