horiba LAQUA-PC1500, Instruction Manual

Page: 29 / 100

pH Calibration
11
■ Calibration
This section describes the calibration procedures using the LAQUA-PC1500 benchtop meter,
pH and conductivity electrodes.
● 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 meter and plug in the pH electrode.
• Prepare the buffers required for calibration.
• Keep the meter in pH measurement mode.
• Dip the pH electrode at least 3 cm in the 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 buffer setup is BUFF USA . If you want to change to BUFF NIST or BUFF DIN ,
refer to “P1.1 Buffer Setup” 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 “P1.2 Erase Calibration Data” on page 27.
Note
Tip