What are the reasons for the abnormal measurement value of 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.
