Turner Designs Ballast-Check 2, Руководство пользователя

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Ballast-Check 2 User’s Manual
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20.
When finished viewing data, or if ready to run the next sample, press ESC to get to
the HOME screen and repeat sampling procedure.
Note: It is recommended you repeat the above steps using 3 aliquots from the
sample. If you see inconsistent results, please refer to the Sample Handling
Guidelines in Section 4.2.
4.5 Data Displayed and Interpretation of Results
The set fluorescence thresholds in Ballast-Check 2 define values for the Abundance and
Activity of algae in the ballast water sample. These correlate to the Ballast Water discharge
standard, in IMO/USCG D2, for organisms: less than 10 viable/living organisms/ml in the 10-
50 micron size class.
Ballast-Check 2 provides a RISK assessment as either HIGH, for samples that are in
exceedance of the discharge standard, or LOW if the sample has not exceeded the
discharge standard’s requirements. Samples with HIGH RISK will report an Abundance
greater than 10 AND an Activity greater than 0.25. If the Abundance is less than 10 OR the
Activity is less than 0.25, then the RISK assessment will display as LOW.
The Abundance value represents a count of the algal cells in the sample in cells/ml.
The Activity value measures the photosynthetic efficiency (capability of reproduction) of
algae in ballast water to assess viability of the algal cells. The Activity is reported as a ratio
between 0.01 and 0.75. All values outside of this range are reported as Non-Detect (ND).
The table below shows example readings and advice on restorative action:
Example
Readings Risk
Abundance
cells/ml Activity Interpretation Advised action
1 LOW < 10 < 0.25
Within D2
Guidelines Maintain BWTS performance
2 LOW < 10
≥ 0.25
Within D2
Guidelines Maintain BWTS performance
3 LOW > 10 < 0.25
Within D2
Guidelines Maintain BWTS performance
4 HIGH > 10
≥ 0.25
Exceeds D2
Guidelines
Retest from sample flow.
Check BWTS performance. If
results remain high, plan for a
more detailed analysis at
earliest opportunity.
If the sample being analyzed exceeds the upper detection limit of the instrument
(> 2,000 cells per ml) then HIGH will be displayed for risk and a value of OVER will be
displayed for abundance; Activity will not be valid for this sample and display NA.
Note: You will not be prompted to filter the sample through the 10 micron filter in
this case
.
This sample will be considered too high to count.