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16.3 Function Test at Classification Survey and Port State Control
All 15 ppm Bilge Alarms leaving our works are calibrated according the requirements with
an accuracy of better than ± 5 ppm within the measuring range. The alarm points are
preset to 15 ppm (or 5 ppm for instruments limited to 5 ppm set point see section 17.
OMD-24 Series with 5 ppm Alarm Set Point), and can only be changed to a lower value on
site. A setting to a higher value is not possible.
To provide a simple procedure for instrument check aboard ship, the OMD-24 Series are
constructed in that way, that the zero check also confirms the instrument drift within the
specifications. The “TEST” button (see 21.2.1 Functional Button “TEST”) starts a
self-test routine and allows to put both alarms contacts into alarm condition. The
instrument will count down from an assumed high reading (30 ppm) downwards until the
assumed value is equal to the actual measured ppm value.
i
Note that this test will only switch the alarm contacts to non-alarm condition, if the
sample contains less than 15 ppm oil content and all other conditions for proper
measurement are OK.
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