pH Calibration

• Calibration should be carried out with the standard pH solutions as close to 25°C as is possible (This is particularly important for a non temperature compensated pH probe and less important for a compensated one)
• Place the pH Probe in a known standard pH solution
• Wait for the pH probe to stabilize to the known pH
• Enter the known pH value into the First Point Actual Value box
• Click on the First Point button
• Place the pH Probe in a second known standard pH solution
• Wait for the pH probe to stabilize to the known pH
• Enter the second known pH value into the Second Point Actual Value box
• Click on the Second Point button
• Click on the Write Unit, Scaling and Calibration values to the Logger button

It is recommended that the two standard pH solutions for calibration be at least 5pH units apart. Probes calibrated in the factory are calibrated at 4pH and 9.22pH

Example

• Place the pH Probe in a standard 4pH solution at 25°C
• Wait for the pH probe to stabilize to 4pH
• Enter 4 into the First Point Actual Value box
• Click on the First Point button
• Place the pH Probe in a standard 9.22pH solution at 25°C
• Wait for the pH probe to stabilize to 9.22pH
• Enter 9.22 into the Second Point Actual Value box
• Click on the Second Point button

• Click on the Write Unit, Scaling and Calibration values to the Logger button
• Calibration is now complete