YSI EcoSense DO200A - Manual (Page 6)

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7. ºC: Temperature display.
OPERATIONAL PROCEDURES
Press to turn the unit on or off. The instrument will perform a self-diagnostic test, during
which an “ovEr” message may appear on the display. This is normal. After the warm up is
complete the message will disappear. After the self-diagnostic test completes, the
temperature displays in the lower right of the display, and the unit is ready for operation.
Immerse the probe into the sample solution. If possible, do not allow probe to touch any solid
object in the solution. Avoid air bubbles bursting on the membrane surface. When the unit is
not in use, turn it off to save battery life. The instrument has a 30 minute auto shut off feature
when not in use.
NOTE: During an oxygen measurement, the probe must be moved approximately 1/2 ft per
second to overcome the consumption of oxygen by the sensor. When using the 200-BOD lab
probe, however, simply use the probe’s self-stirring feature.
MEASUREMENT MODES
This unit provides three distinct measurements:
1. Temperature - Current solution temperature continually displays.
2. Dissolved Oxygen % - Measurement of oxygen in percent saturation.
3. Dissolved Oxygen ppm - Measurement of oxygen in ppm (mg/L).
Carefully observe the units displayed at the far side of the LCD to determine the desired
mode.
SAVING, VIEWING AND DELETING DATA
The DO200A can save 50 data records. When in measurement mode, press  to save a
record. The instrument will confirm the saved data by displaying SAVE and the record
number for one second. “Full” is displayed when trying to save data and the memory is full.
To view saved data, press mode until RECALL is displayed and then press . 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  . “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  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  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.
CALIBRATION SET-UP
Requirements
1. The approximate pressure (in millibars [mBar]) of the location at the time of calibration.
2. The approximate salinity of the water to be analyzed. Fresh water has an approximate
salinity of zero parts per thousand (ppt). Seawater has an approximate salinity of 35 ppt.
Procedure
1. For the field probe, place 5-6 drops of clean water (tap, distilled, or deionized) into the
sponge inside the calibration bottle. Turn the bottle over and allow any excess water to
drain out of the bottle. The wet sponge creates a 100% water-saturated air environment