Thermo Fisher Scientific EcoScan pH/Ion 5 & 6 - Manual (Page 13)

Instruction Manual pH 5/6 & Ion 5/6
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3.2.4 pH Calibration using Pb standard buffers
1. Pour a known pH buffer standard solution into a clean container, e.g. pH 6.97.
Power on meter, and it automatically enters into measurement mode. Select pH
mode by pressing MODE key if necessary.
2. Dip both pH electrode and temperature probe into pH 6.97 buffer solution. Swirl
gently and wait for reading to stabilise (approx. 30 seconds depending on your
electrode condition).
3. Press CAL key to enter pH calibration mode. A “CA” displays momentarily and the
display shows the current uncalibrated reading flashing while in the calibration
mode.
4. To abort or cancel calibration without accepting new value, press CAL key. The
meter then reverts to pH measurement mode.
5. To proceed calibration, allow reading to stabilise first. The meter automatically
recognises either pH 4.10 or 6.97 buffer. Press ENTER key to confirm calibration
and the LCD displays “CO” momentarily. The meter reverts to measurement mode.
6. For 2-point calibration, repeat step 3 with pH 4.10 buffer for better accuracy.