Thermo Fisher Scientific CyberScan PC 300 - Manual (Page 12)

Instruction Manual PC 300
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4.2 Preparing the Meter for Calibration
Before starting calibration, make sure you are in the correct measurement mode. When you
switch on the meter, the meter starts up in the measurement mode you shut it off in. For
example, if you shut the meter off in pH measurement mode, the meter will come back into pH
measurement mode when you switch the meter on.
4.3 pH Calibration
NOTE: We recommend that you perform at least 2-point calibration using standard
buffers that bracket (one above and one below) the expected sample range.
Preparing for pH calibration
This meter is capable of up to 5-point pH calibration to ensure accuracy across the entire pH
range of the meter. Select from the following buffer options:
•
pH 1.68, 4.01, 7.00, 10.01 and 12.45 (USA)
•
pH 1.68, 4.01, 6.86, 9.18, 12.45 (NIST)
The meter automatically recognizes and calibrates to these standard buffer values, which
makes pH calibration faster and easier.
Be sure to remove the protective electrode storage bottle or rubber cap of the electrode
before calibration or measurement. If the electrode has been stored dry, wet the electrode
in tap water for 10 minutes before calibrating or taking readings to saturate the pH electrode
surface and minimize drift.
Wash your electrode in de-ionized water after use, and store in electrode storage solution. If
storage solution is not available, use pH 4.01 or 7.00 buffer solution.
Do not reuse buffer solutions after calibration. Contaminants in the solution can affect the
calibration and eventually the accuracy of the measurements. See Section on Accessories for
information on our high-quality pH buffer solutions.