Principle Of Operation; Measuring Principle; Features; Adjustment - Deckma Hamburg OMD-2008 Instruction Manual

3

Principle of operation

3.1

Measuring Principle

An optical sensor array measures a combination of light scattered and absorbed
by oil droplets in the sample stream. The sensor signals are processed by a
microprocessor to produce linearized output.
If an alarm (works set point 15 ppm, or 10 ppm or 5 ppm respectively) 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

Solid suppression capability

Low maintenance

Easy installation

Constant readiness

Low spare part stock holding

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 (or 10 ppm, or 5 ppm for certain versions).
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 "Settings-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 there 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.
Issue: 08.07.2015
DECKMA HAMBURG GmbH
Instruction Manual OMD-2008 (EV, FC, MCU Versions) Page 4 of 28