Horiba Scientific LAQUA-PD210, Instruction Manual

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pH calibration
11
■ Calibration
This section describes the basic calibration method using LAQUA PD200 handheld meter, pH
electrode and DO electrode.
● pH Calibration
Calibration is necessary for accurate pH measurement. To perform pH calibration, follow the
procedure detailed below.
Prerequisites
• Clean the pH electrode with DI (deionized) water and wipe it with tissue paper.
• Switch on the PD meter and plug in the pH electrode.
• Prepare buffer solution required for calibration.
• Keep the meter in pH measurement mode.
• Dip the pH electrode at least 3 cm in the buffer solution.
• Perform two-point calibration using:
pH 7 and 4 for acidic sample.
pH 7 and 10 for alkaline sample.
• Perform three-point calibration using pH7, 4 and 10 if you are unsure of the expected
sample pH value. It is recommended to calibrate with pH7 first.
• Default buffer setup is BUFF USA . If you want to change to BUFF NIST or BUFF DIN ,
refer to “P 1.1 Buffer selection” on page 26.
• To abort an ongoing calibration process at any point of time, press the key.
• It is recommended to clear the previous calibration data before performing calibration. For
erasing the calibration data, refer to “P 1.3 Erase calibration data” on page 28.
Note
Tip