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3.0
PRINCIPLE OF OPERATION
3.1
Measuring Principle
An optical sensor array measure a combination of light scattered and absorbed
by oil droplets in the sample stream. The sensor signals are then processed by a
microprocessor to produce linearised output.
If an alarm (works set point 15 ppm) occurs, the two oil alarm relays are activated
after the adjusted time delay.
The microprocessor continuously monitors the condition of the sensor
components and associated electronics to ensure that calibration accuracy is
maintained over time and extremes of environmental conditions.
3.2
Features
• Robust construction
• Automatic voltage selection
• Solid suppression capability
• Low maintenance
• Easy installation
• Constant readiness
• Low spare part stock holding
• Watertight Housing
• Works adjustment
• Easy settings via menu
3.3
Adjustment
The unit is delivered with a works calibration according the IMO-requirements.
The alarm points are set to 15 ppm.
The "Zero" point is also works calibrated and can be re-adjusted on site by using
the programming mode and clean water. See Section 10.4 "Service-Offset". A
calibration is not permitted. This has to be done according IMO Regulations by
the manufacturer or persons authorized by the manufacturer.
3.4
Displays and Alarms
In the unit are two independent oil alarm circuits available. Both can be set
separately from 1 to 15 ppm. From the manufacturing both alarms are set to
15 ppm (according IMO). The set points can be changed according to the
requirements on site, for example to 10 ppm or 5 ppm. An alarm point setting
above 15 ppm is not possible. The adjustment can be done in the programming
mode as described in Section 10.4.
In this mode also the individual adjustment of the time delays for the alarms and
the possible changing between 0 - 20 mA or 4 - 20 mA output can be done.
Issue: 27.05.08
DECKMA HAMBURG GmbH
Instruction Manual OMD-2005
Page 5 of 25
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