148
DO Operation:
BOD Measurement
XL40 and 60 meters
Final DO measurement for Sample BOD calculation:
1. To take the final reading for BOD measurement, access the
Select Existing ID
scroll box
and select the Bottle ID that you are going to take final DO reading for the BOD calculation.
2. The initial reading and the BOD calculation parameters for that particular sample Bottle ID
display in the
Available sample ID
text box.
3. Touch the
Calculate Final BOD
button to accept the current DO reading as a final reading
for BOD calculation.
If the following parameters match, BOD result will be shown in the screen.
1.
At least one day has passed after taking the initial reading that is stored in the memory for that
particular bottle ID. If not, user will be prompted with message box for taking this reading as
repetitive initial reading.
AND 2)
The final DO reading and DO loss (Difference between the Initial
DO reading and final DO reading) must meet the criteria for sample that set under the Set BOD
configuration option in Setup mode. This condition is only used when calculating the average
BOD value. If this condition is not met, then average BOD will be zero.
The Average BOD values calculated using the calculated BOD value for the samples taken on
the same date with the same description. All seed values on this date will be used to calculate the
seed correction value used in all subsequent samples. Therefore it is necessary to run seed
samples on the same day as the BOD samples. Seed data will be used only if the SEED DO loss
(Difference between the Initial seed DO reading and final seed DO reading) and the final DO
exceed the criteria for seed that is set under the
Set BOD configuration
option in Setup mode.
For a same bottle ID, if subsequent sample value is taken after BOD calculation is done, a
message box will pop up and verify that
Repeat the final reading?
for the BOD measurement.
Touch
OK
to do so and overwrite the final measurement. Touch
Quit
to return to the BOD
measurement screen.
Summary of Contents for XL 20
Page 1: ......
Page 138: ...127 Ion Operation Known Addition Method XL25 50 and 60 meters...
Page 140: ...129 Ion Operation Known Subtraction Method XL25 50 and 60 meters...
Page 142: ...131 Ion Operation Analate Addition Method XL25 50 and 60 meters...
Page 144: ...133 Ion Operation Analate Subtraction Method XL25 50 and 60 meters...