18 ABOUT IMO PSPC (ST)
The Elcometer 456 is capable of
displaying P SPC rea din gs
according to the 90/10 rule as
defined in the International
Maritime Organisation (IMO)
requirements.
To pass the 90/10 rule:
At least 90% of all thickness
measurements shall be greater
than or equal to the NDFT value
and;
N o n e o f t h e r e m a i n i n g
measurements shall be below 0.9
x NDFT.
To PASS 90/10
At least 90% of
all readings must
be in this zone...
90/10 FAILED if
Less than 90% of
all readings are in
this zone...
... no readings
must be in this
zone
... any readings
are in this zone
AND
OR
SUBSTRATE
COATING
0.9 x NDFT
NDFT
While you are taking readings with PSPC selected, your gauge will advise
you whether the readings are passing or failing the rule:
Ÿ When the PSPC statistics are in the passing state, the reading
value is white and the green LED flashes;
Ÿ When the PSPC statistics are in the percent fail state, the reading
value is white and both the red and green LEDs flash;
Ÿ When the PSPC statistics are in the reading fail state, the reading
value is red and the red LED flashes.
Note: The default value for NDFT is 320µm (12.6mils) - from PSPC for Ballast Water
Tanks.
Note: The 90/10 rule is not compatible with the counted average data collection method
(see Batching on page 26) and cannot be used when saving readings using this method.
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