Thermo Fisher Scientific CyberScan PC 300 - Manual (Page 13)

Instruction Manual PC 300
9
To Calibrate pH:
1. If necessary, press the MODE key to select pH
mode. The pH indicator appears in the upper right
hand corner of the display.
2. Rinse the probe thoroughly with de-ionized water
or a rinse solution. Do not wipe the probe; this
causes a build-up of electrostatic charge on the
glass surface.
3. Dip the probe into the calibration buffer. The end
of the probe must be completely immersed into
the sample. Stir the probe gently to create a
homogeneous sample.
NOTE: The temperature element is in the conductivity
cell. For temperature compensated readings, dip
the conductivity cell into the calibration buffer as
well.
4. Press CAL/MEAS to enter pH calibration mode.
The CAL indicator will be shown. The primary
display will show the measured reading while the
smaller secondary display will indicate the pH
standard buffer solution.
5. Wait for the measured pH value to stabilize. See
Figure 5.
Figure 5 - pH Calibration