YSI BOD Analyst Pro - Manual (Page 87)

YSI BOD Analyst Pro ® User Manual 87
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.
The Blank DO depletion (albeit small) will be subtracted during the BOD calculations.
This is common in some countries outside the US (e.g., UK).
You can change this field at any time.
The default setting is unchecked (OFF).
Do you pre dilute 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. Although sometimes called a serial dilution, in BOD Analyst Pro this ratio is
called the Pre-dilution.
When this box is checked, the Pre Dil column will appear on the Bench Sheet.
When this box is not checked the Pre Dil column is hidden, but technically 1.00 for no dilution.
Example entry would be 2; and this would mean pre dilution representing 50% original sample.
Calculated BODs would include a 2x factor in the equation to account for Pre Dilution.
The default setting is unchecked (OFF) or Pre Dil = 1.00
Volume of bottles (ml)
The majority of wastewater laboratories in the US use 300 ml bottles.
Any value is legal in this field.
You can change this field at any time.
The default value is 300.
Dilution unit
You may enter your “sample dilution” as ml of sample or % sample in the bottle.
The dilution is not the amount of diluent but rather the amount or % of sample in the bottle.
Example: 75 ml of sample in a 300 ml bottle would be 25% sample dilution.
Use the pull down list to make your selection.
You can change this at any time; however the program does not convert ml to %. You must
reenter the correct number to go with the units if you choose to change this value.
The 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 added 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 (ml/L).
See the section “Seeding Method” for a detailed description.
The default setting is Bottle.
Report Font
This sets the font used in the Bench Sheet Report.
The choices come from a drop down menu that include the font types that your PC supports.
The default is Arial.