DECKMA HAMBURG GmbH
Issue: 25.09.2015 preliminaryInstruction Manual OMD-2008 (All Versions) Page 4 of 28
1 Introduction
1.1 General
The OMD-2008 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.
Instruments with maximum Alarm set-points of 10 ppm or 5 ppm respectively are
available.
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 a status input from the separator.
A 0(4) - 20 mA (equal to 0 - 30 ppm) signal output is available for driving a
recorder or external meter.
1.2 Instrument Versions and Options
The OMD-2008 is available in different versions. It may be equipped with an
electric switchover valve for clean water usage, and a Flow Sensor. A Manual
Cleaning Unit (MCU) is available as an option. Different instrument versions are
covered in this document. Please verify instrument version on site and refer to
the relevant sections of this manual.
1.2.1 FC (Flow Control)
Some OMD-2008 instruments are 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.
OMD-2008 FC instruments have a special interface for the Flow Sensor, so that
the current flow rate can be displayed.
It is possible to have a Flow Switch (similar to the Flow Sensor, but with a simple
ON/OFF output) connected to all versions of OMD-2008.
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