Thermo Scientific Orion Versa Star, Справочное руководство

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Thermo Scientific Orion VERSA STAR Conductivity/Temperature Module
Chapter 4 Conductivity Calibration
The conductivity measurement modes are designed for applications to determine the quality of water in processes
where dissolved ions (Salinity in psu, practical salinity units), purity (Resistance in low microSiemens/cm) and dissolved
salts and other compounds (Total Dissolved Solids, TDS in ppt/ppm). Each measurement has its own units.
Conductivity spans a wide measurement range, so auto ranging in the live readings makes gathering sample data
easier. As the readings change, the units display based on the value change. The Conductivity measurements are
reported back to the Reference Temperature selected in setup.
Up to six conductivity standards can be used for calibration. Always use fresh standards and select standards that
are near the sample conductivity. Prepare the conductivity cell according to the instructions in the conductivity cell
user guide.
Note:
For automatic calibration, the nominal cell constant of the conductivity cell must be entered in the setup
menu before the calibration is performed. Use fresh Thermo Scientific Orion Conductivity Standards with values of
100 μS/cm, 1413 μS/cm and 12.9 mS/cm to use automatic calibration.
1. Press Cal (f1) to begin Conductivity calibration, bracketing expected sample range.
Calibration may be 1 to 6 points.
a. Use fresh standards, rinse cell with deionizer water before each reading, blot dry.
b. Measure the Conductivity standards from the least concentrated standard to the most
concentrated standard for greatest accuracy and to prevent carryover.
c. Follow the onscreen prompts.
d. During calibration, points can be edited or retested prior to acceptance. If the reading
does not stabilize, you may press
Override (f3)
to take the reading.
e. Accept the calibration when it is completed.
2. The calibration information is now displayed by standard beakers and concentrations used in the
calibration when the main measurement screen returns. Press the log view (9) key to view calibration
details. From log view, printing or sending data is an option.