YSI BODAnalyst - Manual (Page 33)

Taking Initial DO Readings Section 6
YSI Incorporated BOD Analyst for Windows Software 29
You don't have to derive initial DOs for every Sample in the Batch. For instance, you may derive
initials for only those Samples that are not required by your NPDES permit. All you need to do is
skip all those dilutions that you want to be derived and measure all the dilutions that you don't
want derived.
You can measure more than one of the dilutions for any Sample. The program will use the
average of the measured dilutions in deriving the initial DOs for any remaining dilutions.
In deriving initial DOs, the program considers all of the constituents of a bottle. For example, the
Sample, Clarifier, has only two constituents, the undiluted sample collected from the clarifier,
and dilution water.
6.5 CORRECTING MISTAKES
If you have finished reading the initial DOs and notice mistakes use the bench sheet to correct the
mistakes. The bench sheet allows you to correct most mistakes by simply moving to the field and
editing the data. You can change the Bottle Number, Sample Volume, Seed Volume and Initial
DO providing it is still the same day that Initials were taken.
You can also retake all the readings or one bottle. Select Read / Retake Initials and choose
either All bottles or This bottle from the menu. All bottles will start at the beginning of the
batch and retake each bottle. This bottle will only read the current bottle. The current cell in the
bench sheet sets the current bottle. In the example below, Influent sample bottle #229 is the
current bottle.