Reason analysis and treatment methods for the abnormality of the measured value of the pH meter
1. The mV area of the instrument is wrong or the measurement is incorrect
Causes of failure: 1) When the input potential exceeds the measurement range, the instrument will display the word "Err" in the mV area; 2) The electrode performance is not good; 3) The measurement channel is set incorrectly; 4) The electrode plug is in poor contact.
Troubleshooting method: 1) Reduce the input value; 2) Replace the good electrode; 3) Reset the measurement channel; 4) Connect the short-circuit plug, the instrument should display about 0.0mV, otherwise there is a problem with the pH measurement unit.
2. Incorrect pH measurement
Causes of failure: 1) The electrode performance is not good; 2) The measurement channel is set incorrectly; 3) The electrode is not calibrated or calibrated incorrectly.
Remedy: 1) Replace the electrode with good performance; 2) Reset the measurement channel; 3) Re-calibrate the electrode or replace the standard solution.
3. The pH meter is unstable during measurement
Causes of failure: 1) Whether the electrode interface is loose; 2) The instability in the measurement of pure water or desalted water is due to the lack of impurities in the water and poor conductivity.
Troubleshooting method: 1) Insert the short-circuit plug into the instrument. If the display is stable, consider replacing the electrode; 2) Calibrate with standard buffer solution.
