YSI BOD Analyst Pro - Manual (Page 80)

YSI BOD Analyst Pro ® User Manual 80
The percentage depletion is defined as Final DO / Initial DO * 100.
This criterion is checked only for samples that are used as Seed.
The default value is defined by the limit 60%.
To turn off the test enter 100% for Maximum.
Use Seed that was closest to 50% depletion
This is one alternative to the 40% to 60% Seed Test.
For the entire Seed sample find the bottle (dilution) that is closest to 50% depletion.
Mark all other bottles in the sample.
The 40% min and 60% max are shaded out when this criterion is checked.
Minimum Seed Correction Factor (mg/l)
This is the minimum acceptable value of the seed correction factor.
The value checked is not the seed correction per ml listed in the Seed Corr field.
It is the actual seed correction used in BOD calculations derived by multiplying the seed
correction per ml by the amount of seed used in the test.
This is checked for any test using seed.
The default value is 0.6 mg/l.
Maximum Seed Correction Factor (mg/l)
This is the maximum acceptable value of the seed correction factor.
This is checked for any test using seed.
The default value is 1.0 mg/l.
Minimum Standard Test BOD (mg/l)
This is the minimum acceptable BOD value for tests with the sample name Standard.
The default value is 163 mg/l (i.e., 200 minus 37).
Maximum Standard Test BOD
This is the maximum acceptable BOD value for tests with the sample name Standard.
The default value is 237 mg/l (i.e., 200 plus 37).
Check Coefficient of Variation
If checked this criterion calculates a Coefficient of Variation (CV) for all dilutions in a sample
and then checks that value against the CV limit.
If the CV limit is exceeded, the lowest concentration dilution is removed from the average and
the CV is calculated for the remaining dilutions.
The CV is again checked against the limits.
This process is repeated until the calculated CV is within limit or only one bottle remains.
The default condition is unchecked; test not performed
Coefficient of Variation Limit
This is the maximum acceptable CV for sample BOD results in the CV test.
This number is typically the CV of GGA standard tests performed by your laboratory.
The default value is 0.35 (35%CV).
Apply Criteria after Final Readings
If checked each bottle is automatically checked against the criteria when the Final DO readings
are completed.
If unchecked the criteria are not checked until the Manual Check button on the main screen is
clicked. Then all criteria are checked at once.