YSI 6 series User Manual page 82

Sondes
---------------Calibrate--------------
1-Conductivity
2-Dissolved Oxy
3-Pressure-Abs
4-ISE1 pH
5-ISE2 ORP
Select option (0 for previous menu):
CONDUCTIVITY
Select 1-Conductivity to calibrate the conductivity probe and a second menu will offer you the options of
calibrating in specific conductance, conductivity, or salinity. Calibrating any one option automatically
calibrates the other two. After selecting the option of choice (specific conductance is normally
recommended), you will be asked to enter the value of the standard used during calibration. Be certain that
the units are correct. After pressing Enter, you will be able to follow the stabilization of the readings and
confirm the calibration when the readings are stable by pressing Enter as instructed on the screen. Then,
as instructed, press Enter again to return to the Calibrate menu.
RAPID PULSE POLAROGRAPHIC DISSOLVED OXYGEN WITH AUTOSLEEP ON
If you intend to do Unattended Sampling, it is recommended that you turn Autosleep RS232 "on" in the
Advanced|Setup menu and follow these instructions for DO calibration. If you intend to do Discrete
Sampling, it is recommended that you turn Autosleep RS232 "off" and use the calibration instructions in
the next section.
Select 2-Dissolved oxygen to calibrate the oxygen probe. The submenu will offer you the option of
calibrating in percent saturation or mg/L. After selecting the option of choice (percent saturation in water-
saturated air is normally recommended), you will be prompted for the next step. Calibrating either of the
choices will automatically calibrate the other.
For the percent saturation mode, be certain that the sensor has been thermally equilibrated in water-
saturated air and that the sensor shows stable readings prior to beginning the calibration routine,
particularly after a membrane change. Note, however, that the sensor should be "off" for at least 5 minutes
before initiating a calibration procedure with "Autosleep" active. If possible, it is ideal that the sensor be
"off" for a time equal to the sample interval in the upcoming study.
Remember, the Calibration Cup is designed to be air-tight and must be loosened if it is used as a
calibration chamber. See Section 2.6, Calibration for more details. Follow the screen prompt and enter
the local barometric pressure in mm Hg, (inches Hg x 25.4), press Enter, and the calibration will
automatically occur after the warm-up time which has been selected by the user (default is 40 seconds).
Then, as instructed, press Enter again to return to the Calibrate menu. Note that at calibration, the DOsat
% (percent air saturation) value will reflect the barometer value that was entered. For example, if a
barometric pressure of 720 mm is entered, the DOsat % value will change to 94.7 % (720/760 x 100).
Note that the parameter "DOsat %Local" is also available for users who prefer to set their percent air
saturation value to 100%, no matter what barometer value is entered. The method of activating this
parameter, its use, and its limitations are described in Appendix J of this manual. The key factor to
remember, however, is that no matter which convention (DOsat % or DOsat %Local) is selected, the mg/L
value will not be affected.
YSI Incorporated Environmental Monitoring Systems Operations Manual
6-ISE3 NH4+
7-ISE4 NO3-
8-ISE5 Cl-
9-Optic T-Turbidity 6136
A-Optic C - Chlorophyll
Section 2
2-76