Deckma Hamburg OMD-2008, Instruction Manual

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Page: 12 of 102
3.4 Alarms
The units contain two independent oil alarm circuits. From the manufacturing both alarms
are set to 15 ppm (according IMO). The set points can be changed according to the
requirements on site, to any point between 1 ppm and 15 ppm. An alarm point setting
above 15 ppm is not possible. The adjustment can be done in the programming mode as
described in the appendix (See section 22.2.3
Functional Buttons AL1/ AL2/ SET).
Both alarm circuits are also related to an alarm LED on the front panel.
In case of malfunction the “SYS LED” will indicate some type of internal fault of the unit.
This LED is flashing green in normal conditions and is red in alarm conditions.
Additional to the alarm LEDs each alarm circuit is equipped with a relay with potential
free alarm contacts. These contacts can be used for external processing of the signal or
for control of further functions. The alarm circuits contain two independent alarm delays,
which can be set separately. In this mode, also the individual adjustment of the time
delays for the alarms can be done. An alarm delay is set to 4 sec. The flow sensor is
downstream of the Measuring Cell.
If a malfunction or failure of the power supply occurs, all three relays (both alarm relays
and the SYSTEMFAULT relay) will switch to alarm condition. (See Section 23.
Appendix III. for an easily understandable example). If the unit is off, all three
relays will be in alarm condition.
3.5 Adjustment
The unit is delivered with a works calibration according the IMO requirements. A
customer calibration on board is not permitted. This has to be done according IMO
Regulations by the manufacturer or persons authorized by the manufacturer.
The units contain two alarm delays. Alarm 1 is to be used for signing purposes and the
delay can be set from 1 sec. to 9 min. Alarm 2 is limited to control overboard discharge.
The Alarm 2 delay can be set from 1 sec. to 10 sec. max.
The "Zero" point is also works calibrated and is adjustable to ± 5 ppm.
On site by using the programming mode (See Section 22.2.3 Functional Buttons
AL1/ AL2/ SET ) and clean water you can adjust following settings:
Settings Min. Max. Default.
Alarm 1/ Alarm 2 1 ppm 15 ppm 15 ppm
Delay 1 1 sec. 9 min. 2 sec.
Delay 2 1 sec. 10 sec. 10 sec.
Offset -5 ppm 5 ppm 0 ppm
Table 1