Tintometer Lovibond SensoDirect 150 Mode D'emploi page 27

ambient environment). However not every pH Electrode is as accurate as the "ideal" one,
so calibration procedures are necessary before first time measurement. In addition to
calibration before first time measurement, users are also recommended to carry out regular
calibration to ensure high accuracy measurements.
Calibration Procedure
1. Attach the pH Electrode by installing the "Probe Plug" (Fig. B-1) into the "pH Socket/
BNC Socket" (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.
• Automatic temperature compensation, refer to 3.2.
4. Hold the "pH Electrode body" (Fig. B-2) and completely immerse the "Sensing Head"
(Fig. B-3) in the buffer solution and gently swirl the probe. The display will show the pH
value.
5. Press the "REC" button and "HOLD" button at the same time. The display will show
the following screen as an example. Now release.
23.5 °C
6. • If the buffer solution is pH 7.0 (± 1 pH), the upper display will show 7.00
automatically.
• If the buffer solution is pH 4.0 (± 1 pH), the upper display will show 4.00
automatically.
• If the buffer solution is pH 10.0 (± 1 pH), the upper display will show 10.00
automatically.
• If the buffer solution value is beyond pH 7.00, pH 4.00, pH 10.00 (for example
7.01, 4.02, 10.03) then use " " button, " " button to adjust the display value
to exactly match the pH buffer solution value.
7. Press the "Enter" button twice to save the calibration data and finish the calibration
procedure.
8. The described procedure can be performed for the following calibration points:
pH7 calibration
pH4 calibration
pH10 calibration
• Calibration should always start with pH7, followed by pH4 and / or pH10 calibration.
• Rinse the electrode with distilled water before each calibration point.
• Repeat the above calibration procedures at least twice to ensure accuracy.
SensoDirect 150
7.00
PH CAL.
^, v Enter : Y
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