5
AL10pH
4-2 Equipment Required
i) Combination pH electrode
ii) pH 4.0 & pH 7.0 buffer solutions
4-3 Two Point Calibration
i) Connect the pH electrode to the BNC socket (Figure 1, 5) and immerse
in pH 7.0 buffer solution.
ii) Switch the instrument on by pressing the Power ON Button (Figure 1, 2).
iii) Adjust „pH 7 Adjust „ (Figure 1, 6) until the display reads exactly pH 7.0.
iv) Rinse the electrode in distilled water.
v) Place the electrode into buffer pH 4.0 solution.
vi) Adjust „pH 4 Adjust „ (Figure 1, 7) until the display reads exactly pH 4.0.
vii) Rinse the electrode in distilled water.
viii) Repeat steps iii) to vii) at least twice.
4-4 Single Point Calibration
i) Connect the pH electrode to the BNC socket and immerse in a standard
buffer solution (eg pH 7.0 or higher if available).
ii) Switch the instrument on by pressing the Power ON Button (Figure 1, 2).
iii) Adjust the “pH 7 Adjust „ (Figure 1, 7) until the display reads the same value as the
standard buffer solution used.
5. TAKING MEASUREMENTS
After calibration, the unit is ready for taking measurements.
i) Connect the pH electrode to the BNC socket.
ii) Switch the instrument on by pressing the Power ON Button.
iii) Immerse the electrode in the solution being measured; the instrument will display the
pH value.
iv) During measurement, pressing the Data Hold Button (Figure 1, 4) will freeze the
display. At the same time the display will show a Data Hold indicator. To release
the display freeze function, press the Data. Hold Button again; the Data Hold
indicator will disappear from the display.
v) After taking a measurement, rinse the electrode in distilled water.