YSI ODO200 - Manual (Page 14)

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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.
CALIBRATION
TEMPERATURE
All EcoSense ODO200 cables have a built-in thermistor. Temperature
calibration is not available or required. To verify the temperature sensor,
compare it to a NIST traceable thermistor by touching the thermistors
together and observing the measurements.
DISSOLVED OXYGEN
The ODO200 sensor is an optical luminescent sensor which has greater
stability and is less susceptible to calibration drift than traditional
electrochemical sensors. This increased stability means the instrument
can hold its calibration for many months; however, calibration should
be verified regularly for highest data accuracy.
To verify the instrument’s calibration, place the sensor in its calibration
environment and check to see that the DO% is reading its calibration
value based on the barometric pressure. Refer to Appendix A for the
DO% calibration values based on barometric pressure.
Calibration Requirements:
• The approximate true barometric pressure in millbars (mBar) of the
location at the time of calibration.
True Barometric Pressure (mmHg) =
[Corrected BP mmHg] – [2.5 * (Local Altitude in ft. above sea level/100)]
mBar = mmHg *1.333
• The approximate salinity of the water to be analyzed. Fresh
water’s salinity value is approximate zero parts per thousand (ppt).
Seawater has an approximate salinity of 35 ppt.
1. Moisten the sponge in the gray storage sleeve with a small
amount of clean water. The moistened sponge creates a 100%
water-saturated air environment for the probe, which is ideal