10
Press the “Function” button once so that the bottom right
display shows “mV“ .
4) The upper display will show the mV value.
3.4 pH calibration
Calibration - Introduction
An “ideal” pH Electrode generates 0 mV at pH 7.00 (177.4 mV at
pH 4). The meter has been calibrated with signals which simulate
the “ideal” pH Electrode (based on 25°C ambient environment).
However not every pH Electrode is as accurate as the “ideal” one,
so calibration procedures are necessary before first time measure-
ment. In addition to calibration before first time measurement, us-
ers are also recommended to carry out regular calibration to ensure
high accuracy measurements.
Required Equipment for Calibration
1) pH Electrode.
2) pH buffer solutions.
Calibration Procedure
1) Attach the pH Electrode by installing the “Probe Plug“ (Page 8,
Fig. B-1) into the “pH Socket/BNC Socket“ (Page 5, Fig. A-16).
2) Power on the meter, set the mode to pH measurement, and the
bottom right display will show “PH“ .
3) Adjust the “Temperature Compensation Value“ to make it the
same temperature as the pH buffer solution.
• Manual temperature compensation value adjustment
procedure, refer to 7-7, page 28.
• Automatic temperature compensation, refer to 3.2,
Page 9.
4) Hold the “pH Electrode body“ (Page 8, Fig. B-2) and completely
immerse the “Sensing Head“ (Page 8, Fig. B-3) in the buffer solu-
tion and gently swirl the probe. The display will show the pH value.
