YSI 6 series User Manual page 46

Sondes Section 2
Note that all parameters that have been enabled will appear - not just the one being calibrated at the moment.
The user should carefully observe the stabilization of the readings of the parameter that is being calibrated
and, when the readings are stable for approximately 30 seconds, press Enter to implement the calibration and
the following message will appear.
Calibrated. Press <Enter> to continue.
NOTE: If an ERROR message appears, begin the calibration procedure again. Be certain that the value you
enter for the calibration standard is correct. Also see Section 6, Troubleshooting for more information on
error messages.
CAUTION: Be certain to immerse the entire sonde in solution standards for calibration of all parameters.
Most calibrations require readings not only from the sensor being calibrated but also from the temperature
sensor.
Specific start-up calibration procedures for all sensors that commonly require calibration are provided in the
following paragraphs of this section. Remember that these are basic protocols designed to get the user up and
running with your 6-series sonde. A more-detailed discussion of sensor calibration can be found in Section
2.9.2.
CONDUCTIVITY
This procedure calibrates conductivity, specific conductance, salinity, and total dissolved solids.
Place the correct amount (see Tables 1-8) of 10 mS/cm conductivity standard (YSI 3163 is recommended)
into a clean, dry or pre-rinsed calibration cup.
Before proceeding, ensure that the sensor is as dry as possible. Ideally, rinse the conductivity sensor with a
small amount of standard that can be discarded. Be certain that you avoid cross-contamination of standard
solutions with other solutions. Make certain that there are no salt deposits around the oxygen and pH/ORP
probes, particularly if you are employing standards of low conductivity.
Carefully immerse the probe end of the sonde into the solution. Gently rotate and/or move the sonde up
and down to remove any bubbles from the conductivity cell. The probe must be completely immersed past
its vent hole. Using the recommended volumes from the table in the previous subsection should insure that
the vent hole is covered.
Allow at least one minute for temperature equilibration before proceeding.
From the Calibrate menu, select Conductivity to access the Conductivity calibration procedure and then 1-
SpCond to access the specific conductance calibration procedure. Enter the calibration value of the
standard you are using (mS/cm at 25C) and press Enter. The current values of all enabled sensors will
appear on the screen and will change with time as they stabilize.
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 press Enter again to return to the Calibrate menu.
Rinse the sonde in tap or purified water and dry the sonde.
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