YSI BODAnalyst - Manual (Page 62)

Customizing Your Program Section 11
YSI Incorporated BOD Analyst for Windows Software 58
want the program to derive. You must measure at least one dilution for each Sample. It is best to
measure the strongest dilution. If you measure more than one dilution for a Sample, the program
will use a weighted average of the measured dilutions to derive the others. The default value is
unchecked (off).
Blank compensation: You may compensate your BODs for the depletion of your blanks by
checking this field. This is common in the United Kingdom. The default setting is unchecked
(off). You can change this field at any time
Do you predilute your bottles: Very strong samples sometimes require dilutions that would be
difficult to make in one step. In these cases, a sizeable quantity of sample is first diluted to a ratio
that will make the final dilutions practical. Sometimes a pre-dilution is called a serial dilution. In
the BOD Analyst software, we call this ratio the pre-dilution. Some people find it easier to adjust
for the strength of each sample with the pre-dilution while keeping the final dilutions constant for
all samples. When this box is checked, the Pre Dil column will appear on the bench sheet
allowing for entry of the ratio (ie 2 would be a 2:1 ratio). If this box is not checked, the Pre-dil
column will be hidden on the bench sheet and no pre-dilution will be allowed.
Volume of bottles (ml): The vast majority of wastewater laboratories in the U.S. use 300 ml
bottles. Any value is legal. You can change this field at any time. The default value is 300.
Dilution unit: Some people like to think of their dilutions as percent (%), others prefer to think
of dilutions as the number of milliliters of sample in a BOD bottle (ml). Use the pull down list to
make your selection. You can change this at any time. Default value is ml.
Seed added to: This field describes the seeding method that you use. If you do not seed any
samples then you may disregard this field. If you add seed material directly to each bottle, then
set the field to Bottle. If you add seed material to the dilution water, then set the field to Blank.
It is important to understand how this field affects the seed Qty: field on the Sample Form. The
quantity of seed when adding seed material directly to a bottle must be expressed in milliliters.
When adding seed material to the dilution water, the seed quantity must be expressed in milliliters
per liter. See the section “Seeding Method” for a detailed description.
Report Font: Sets the font for the Daily Bench Sheet Report and the Everything Report. The
choices are Arial, MS Sans Serif, Tahoma, and Times New Roman. If your reports are not
printing correctly it maybe that your printer does not support the selected font. Therefore, choose
a different font. The default is Arial.
11.5 THE YSI PARAMETERS FORM
This form is used to describe how the program will work with the YSI 5000/5100 DO Instrument.
To get to the form, select Setup / YSI 5000/5100 Dissolved Oxygen Instrument. You can
change any of the fields on this form at any time.