YSI 6000UPG - Manual (Page 37)

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Observe the readings under Specific Conductance or Conductivity and when they show no
significant change for approximately 30 seconds, press Enter. The screen will indicate that the
calibration has been accepted and prompt you to Hit any key to return to the Calibrate menu.
Rinse the sonde in tap or purified water and dry the sonde.
DISSOLVED OXYGEN
Place approximately 1/8 inch (3 mm) of water or a wet sponge in the bottom of the Calibration Cup
or Transport Cup. Place the probe end of the sonde into the cup. Make certain that the DO and the
temperature probes are not immersed in the water. Wait approximately 10 minutes for the air in the
calibration cup to become water saturated and for the temperatures of the thermistor and the oxygen
probe to equilibrate.
CAUTION: If the Transport Cup is used, make certain that the cup is vented to the atmosphere by
loosening the vent screw.
From the Calibrate menu, select 2. DO% to access the DO % calibration procedure.
Enter the current barometric pressure in mm of Hg. (Inches of Hg x 25.4 = mm Hg).
NOTE: Remember that barometer readings which appear in meteorological reports are generally
corrected to sea level and are not useful for your calibration procedure unless they are
uncorrected.
Press Enter and the computer will indicate that the calibration procedure is in progress.
After approximately 1 minute, the calibration will be complete. Press any key, as instructed, and
the screen will display the percent saturation value which corresponds to your local barometric
pressure input. For example, if your barometer reads 742 mm Hg, the screen will display 97.6 %
(742/760) at this point.
After the calibration is complete, press any key to return to the Calibrate menu.
NOTE: Calibration of dissolved oxygen in the DO % procedure also results in calibration of the
DO mg/L mode and vice versa.
Rinse the sonde in water and dry the sonde.
Calibration will AUTOMATICALLY occur after warmup interval.
Warming Sensors: 27