Thermo Fisher Scientific CyberScan DO 600 - Manual (Page 26)

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It is recommended that you perform at least a 2-Point Calibration using
standard buffers that adequately cover the expected measurement range, prior
to measurement.
For Ion
Connect the ISE to the BNC connector of the meter.
Remove plastic protective cap of ISE. Briefly rinse the electrode with clean
water to remove any residues. Rinse ISE before and after each calibration or
sample measurement to avoid cross-contamination. Ensure that you use new or
fresh standard solutions during calibration. Do not reuse Ion standard solution
as it may be contaminated and affect the calibration and accuracy of
measurements.
For Conductivity
Connect the conductivity probe with built-in temperature sensor into the 8-pin
connector of the meter.
For best results, select a standard value close to the sample value you are
measuring. Alternatively use a calibration solution value that is approximately
2/3 the full-scale value of the measurement range you plan to use. For example,
in the 0 to 2000 µS conductivity range, use a 1413 µS solution for calibration.
Perform calibration for all measurement ranges to ensure the highest accuracy
throughout all measurement range.
If you are measuring in solutions with Conductivity lower than 100 µS/cm or
TDS lower than 50 ppm, calibrate the meter at least once a week to ensure
accuracy. If you are measuring in the mid ranges and you wash the electrode in
de-ionized water and store it dry, calibrate the meter once a month. If you take
measurements at extreme temperatures, calibrate at least once a week.
Ensure that you use new conductivity standard solutions or sachets during
calibration. Do not reuse standard solutions as it may be contaminated and
affect the calibration and accuracy of measurements. Use fresh calibration
solution each time you calibrate your meter. Keep solutions in a dry and cool
environment if possible.
For DO(%) and DO (mg/L) Calibration
Before starting calibration, make sure you are in the correct measurement mode
and in the correct calibration sequence. The temperature and the %
Saturation calibration must be done first before attempting to do the mg/L
(ppm) Concentration calibration.
Rinse the probe well in the de-ionized (DI) water or rinse solution and wipe the
probe carefully taking care of the membrane.
Calibrate the meter in all the modes to ensure the highest accuracy throughout
the DO measurement range. In % Saturation, the meter is able to perform either
a one point calibration or a 2 point calibration. For one point calibration, it is
recommended that you perform a 100% Saturation calibration in saturated air. If
you opt for 2 point calibration, you can calibrate for 100% Saturation in
saturated air and 0% Saturation using a zero oxygen solution.