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6. When the proper pressure displays, press Enter
once to view the
calibration value in the lower right of the display. Once the value in the
main display stabilizes, press Enter
again to move to the salinity
compensation procedure.
7. The display prompts for the approximate salinity of the water to be
analyzed. Use the Up and Down keys to increase or decrease the
salinity compensation value to the value of your sample (between 0 to
40 parts per thousand [ppt]). When the correct salinity displays, press
Enter
.
8. The unit holds calibration even if it is powered off. However, it is
recommended to check calibration with each use and recalibrate
as necessary to prevent drift. Dissolved oxygen readings are only as
good as the calibration.
Saving, Viewing and Deleting Data
The DO200A can save 50 data records, while the DO200M can save 250
data records. When in measurement mode, press Enter
to save a
record. The instrument will confirm saving the data by displaying “Save”
and the data record number for one second. “Full” is displayed when
trying to save data and memory is full.
To view saved data, press Mode until “Recall” is displayed and then press
Enter
. Use the Up or Down arrow keys to review different saved
records. Press Mode to escape back to measurement mode.
To delete data records, press Mode while in measurement mode until
“Delete” is displayed. Press Enter
. “All” will be displayed and blinking.
Press the Up or Down arrow key to switch between delete ‘All’ or ‘Each’
options. Select either ‘All’ or ‘Each’ by pressing Enter
while that option
is displayed.
If ‘All’ is selected, all records will be deleted from memory and ‘None’ will
be displayed. Press Mode twice to return to the measurement mode.
If ‘Each’ is selected, the Up and Down arrow keys will allow you to scroll
through the saved data records. Press Enter to delete the selected record.
All records after the deleted record will shift up to keep the records in
sequential order. For example, if record 3 is deleted, record 4 will become
record 3 and record 5 will become record 4. Press Mode twice to return to
the measurement mode.
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