horiba LAQUA 2000 Series, Instruction Manual

Page: 28 / 108

pH Calibration
10
■ Calibration
This section describes the calibration procedures using LAQUA 2000 series benchtop meters
and electrodes.
● pH Calibration
Calibration is necessary for accurate pH measurement. To perform pH calibration using
PH2000, ION2000, or PC2000 meter, follow the procedure detailed below:
Prerequisites
• Clean the pH electrode with DI (deionized) water and wipe it with tissue paper.
• Switch on the meter and plug in the pH electrode.
• Prepare the pH buffers required for calibration.
• Keep the meter in pH measurement mode.
• Dip the pH electrode at least 3 cm in the pH buffer.
• Perform two-point calibration using:
pH 7 and 4 for acidic sample.
pH 7 and 10 for alkaline sample.
• Perform three-point calibration using pH 7, 4 and 10 if you are unsure of the expected
sample pH value. It is recommended to calibrate with pH 7 first.
• Default pH buffer group in buffer setup is USA . If you want to change to NIST , NIST2 , DIN ,
or CUST (Custom) refer to “P1.1 Buffer Setup” on page 29.
• For USA , NIST , NIST2 , and DIN pH buffer groups, follow the Auto Calibration procedure.
For CUST , follow Manual Calibration procedure.
• 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 “P1.4 Calibration Clear Setup” on page 32.
Note
Tip