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16. Calibration
16.1 OMD-24 Series
15 ppm Bilge Alarms built according MEPC.107(49) have to be protected against access
beyond the checks of instrument drift, repeatability of the instrument reading and zero
adjustment. For this reason, the instrument is electronically sealed, so that only the
manufacturer or his authorized persons, equipped with the related tools, are able to get
access for changing the calibration.
To provide a simple procedure to check the instrument aboard ship, the OMD- 24 is
constructed in that way, that the zero check also confirms the instrument drift within the
specifications.
16.2 Calibration and Repeatability Check
a) Switch off the power supply and stop any water flow.
b) Clean the Sample Glass Tube accurately by using a suitable Cell Cleaning Brush as
described under Section 12. Operator Maintenance.
c) Run clean water through the instrument.
d) Make sure that non-aerated, clean water is in the instrument. The reading should be
0 ppm ± 2 ppm.
e) Continue as described under Section 11. OMD-24 Series Operating
instructions.
i
Please note: MEPC.107(49) wording regarding instrument calibration:
MEPC.107(49) Section 4.2.11:
[Quote]
The accuracy of the 15 ppm Bilge Alarms should be checked at IOPP
Certificate renewal surveys according to the manufacturer’s
instructions. Alternatively, the unit may be replaced by a
calibrated 15 ppm Bilge Alarm. The calibration certificate for
the 15 ppm Bilge Alarm, certifying date of last calibration check,
should be retained on board for inspection purposes. The accuracy
checks can only be done by the manufacturer or persons authorized
by the manufacturer. [End Quote]
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