Oil-in-Water Monitors

For continuous measurement of the oil concentration in water in the ppm range.

A wide range of monitors

As DECKMA HAMBURG GmbH distributor Hydro-Carbon Filtration & Separation offers oil-in-water monitor systems for continuous measurement of the oil concentration in water in the ppm range.

The measurement method employs light scattering as the base technique, but uses a novel concept whereby multiple wavelength light sources combined with multiple detector angles are used to differentiate between the various contaminants within the water phase. Great attention has been given to ensure the instrument construction is rugged whilst remaining easy to use.

In addition to a range of monitors to conform to the IMO-regulations for shipboard discharge of oily water we also design and manufacture systems for such applications as: Boiler Condensate, Process Water, Cooling Water and General Effluent Discharge from Power Stations, Chemical Plants, Tank Farms and Offshore Platforms.

OMD- 24 Series

The OMD-24 Bilge Alarm Unit has been designed specifically for use in conjunction with 15 ppm oil-water separator units and has a specification and performance which exceeds the requirements of the International Maritime Organization specifications for 15ppm Bilge Alarms contained in Resolution MEPC. 107 (49).

The unit is supplied with 2 works-adjusted alarms at 15 ppm. Other set points (10 ppm or 5 ppm) are possible and can be adjusted on site at any time by using the buttons at the front panel. If an alarm set point is exceed, the alarms are visible at the front panel and the appropriate relays are switched.

In case of malfunction the System LED at the front panel will change from blinking green to permanent red. For the data logging function the unit requires an status input from the separator. Optionally a 0(4) – 20 mA (equal to 0 – 30 ppm) signal output is available for driving a recorder or external meter.

OMD- 2008 Series

5 ppm + 15 ppm Bilge Alarm according to IMO Resolution MEPC.107 (49)

OMD-2008 EV FC MCU with Flow Control

The OMD-2008 EV FC MCU is equipped with a Flow Sensor. The Flow Sensor is positioned in the Drain line of the Measuring Cell.

If the flow rate through the Measuring Cell is too low, or if the sample is not flowing at all, the Instrument will go to Alarm condition and issue a “Status: Flow?” message. According to MEPC.107(49) the 15ppm Bilge Alarm has to be provided with a representative sample, i.e. the operator of the instrument is responsible to maintain a proper sample flow through the instrument. The recommended sample flow rate for Deckma instruments is approx. 2 Litres per Minute. At this flow rate, with a common setup of separator and 15ppm Bilge Alarm, it is easily possible to reliably operate the instrument, and to ensure the required short reaction time to changes in the oil content of the effluent water. The instrument does not know about the sample stream flow rate. If circumstances lead to interruptions of the sample flow, or if the sample flow is stopped completely, the portion of the sample that is in the sample glass tube will be measured continuously. The instrument will display the same measurement result for a long time, but it may fail to adequately react to changes in the overboard discharge water oil content. For many years the OMD series instruments have had a dedicated input to connect a flow switch to monitor the sample flow rate. However, not many installation have been made with an additional flow switch. A more easy solution had to be found, a solution that does not require additional pipework, or electrical work, on site. The new OMD-2008 EV FC MCU version of the OMD-2008 instrument come with a flow sensor that measures the sample flow rate, and automatically sets the instrument into alarm condition, if a sufficient flow rate is not maintained. Constructed to make accidental flow interruptions, incorrectly closed valves, and a missing sample stream harmless events that do not lead to unlawful discharge, the OMD-2008 EV FC MCU also makes manipulation and tinkering with the instrument setup much less rewarding. Additionally for the OMD-2008 EV FC MCU instruments a Manual Cleaning Unit (MCU) is available. This system allows to quickly clean the sample glass tube without having to open the Measuring Cell. With the MCU maintenance of the system becomes very easy, ensuring high reliability and reduced maintenance workload.

OMD-32 Series

The OMD-32 Oil-in-Water Monitor has been designed specifically for use in conjunction with oil-water separator units.

The OMD-32 has been constructed using technology of the DECKMA HAMBURG OMD series industrial instruments and 15ppm Bilge Alarm Monitors, that have a specification and performance which exceeds the requirements of the International Maritime Organization specifications for 15ppm Oil-in-Water Monitors contained in Resolution MEPC. 107 (49).The OMD-32 unit is supplied with 2 works-adjusted alarms at 10 ppm. Other set points are possible (e.g. 100ppm) and can be adjusted on site at any time by using the buttons at the front panel. If an alarm set point is exceeded, the alarms are visible at the front panel and the appropriate relays are switched. In case of malfunction the System LED at the front panel will change from blinking green to permanent red, and a system fault relay contact is switched.

A 0(4) – 20 mA signal output is available for driving a recorder or external meter.

TMD-90 Series

The TMD-90 Turbidity Monitoring Device has been designed specifically for measurement of turbidity (NTU) in water.

The TMD-90 has been constructed using technology of the DECKMA HAMBURG OMD series industrial instruments and 15ppm Bilge Alarm Monitors, that have a specification and performance which exceeds the requirements of the International Maritime Organization specifications for 15ppm Oil-in-Water Monitors contained in Resolution MEPC. 107 (49). The TMD-90 unit is supplied with 2 works-adjusted alarms at 50 NTU. Other set points are possible (e.g. 200 NTU) and can be adjusted on site at any time by using the buttons at the front panel.


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We welcome any request for your specific filter element needs. We will assist in the selection of the most efficient and economical solution.