Conductivity Calibration Procedure - Thermo Scientific Orion Star A220 Series User Manual

Thermo Scientific

Conductivity Calibration Procedure

Orion Star A222 conductivity meters can perform a conductivity calibration using one to five
conductivity standards with easy to follow onscreen instructions to assist with the calibration
process or by the manual entry of the certified conductivity cell constant (K) value.
Always use fresh standards and select standards that are near the expected sample
conductivity. Prepare the conductivity sensor according to the instructions in the sensor manual.
Connect all sensors to be used to the appropriate meter inputs.
Make sure the meter measurement mode is set to conductivity (Cond).
Note: For an automatic calibration, enter the nominal cell constant of the conductivity sensor in
the channel-specific setup menu and use Orion 100 μS, 1413 μS and/or 12.9 mS standards.
1. Press the f1 (cal) key to start the calibration.
2. Rinse the conductivity sensor and any other electrodes in use with distilled water, blot
gently with a lint-free tissue to remove excess water and place into the conductivity
standard.
3. When the sensor and standard are ready, press the f3 (start) key.
4. Wait for the value on the meter to stabilize and perform one of the following actions:
a. Press the f2 (accept) key to accept the conductivity value determined by automatic
standard recognition function (Orion 100 μS, 1413 μS and 12.9 mS standards only).
or
b. Press the f3 (edit) key to access the popup number entry screen and manually enter
the conductivity standard value expected at the measured temperature.
i. Press the p, q, t or u key to highlight a number or decimal point, press the
f3 (enter) key to select the highlighted item and repeat until the desired value is
shown at the top of the screen.
ii. Press the f2 (done) key to save the value and exit the number entry screen.
iii. Press the f2 (accept) key to accept the manually entered value.
5. Press the f2 (next) key to proceed to the next standard and repeat steps 2 through 4 or
press the f3 (cal done) key to save and end the calibration. If five standard are used, the
calibration will save and end once the fifth value is accepted.
6. The meter will display the calibration summary and export the data to the calibration log.
Press the f1 (meas) key to proceed to the measurement mode or press the f2 (print) key
to export the calibration data to a printer or computer.
Chapter 5 Using the Conductivity Channel
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