Thermo Fisher Scientific CyberScan pH 10/pH 100 - Manual (Page 15)

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4 CALIBRATION
4.1 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 pH measurement mode.
Before calibrating, select the correct mode by pressing the MODE key. There are 4 modes:
[pH] for pH measurements,
[Temp] for Temperature measurements,
[Rel] [mV] for Relative mV measurements (only for pH 100 meter)
[mV] for millivolt measurements.
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 deionized 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. Refer to Accessories for
information on Eutech Instruments pH buffer solutions.
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. 1-Point Calibration
can also be used for quick measurements. Make sure that the calibration point is close to the
sample value to be measured.
The CyberScan pH 10 & pH 100 meters are capable of multi-point calibration to ensure
enhanced accuracy throughout the pH measurement range. The number of pH calibrations
points and pH buffer standards used are:
Meter Number of Calibration Points Buffer Points (USA standard)
pH 10 Up to 3 points pH 4.01, 7.00 & 10.01
pH 100 Up to 5 points pH 1.68, 4.01, 7.00, 10.01 & 12.45