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18.
Calibration
18.1 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 Series is
constructed in that way, that the zero check also confirms the instrument drift within the
specifications.
18.2 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 14.
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 13.
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
instructions.
calibrated 15 ppm Bilge Alarm.
the 15 ppm Bilge Alarm, certifying date of last calibration check,
should be retained on board for inspection purposes.
checks can only be done by the manufacturer or persons authorized
by the manufacturer. [End Quote]
Operator Maintenance.
renewal
surveys
Alternatively, the unit may be replaced by a
Page: 71
OMD-24
according
to
the
The calibration certificate for
Series
Operating
manufacturer's
The accuracy
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