What are the causes of the pH meter's abnormal measurement value?
1. The measurement or mV area of the instrument is erroneous
Failure factors include: 1) An instrument will display "Err" in the mV area when the input voltage is outside the measuring range; 2) Poor electrode performance; and 3) Other factors. 3) The measuring channel is wrongly selected; 4) The contact between the electrode plug and the plug-in is poor.
Method for troubleshooting: 1) Lower the input value; 2) Change the good electrode; 3) Reset the measurement channel; 4) Connect the short-circuit plug; otherwise, the pH measurement device is malfunctioning.
2. Incorrect pH measurement
Failure factors include: 1) Poor electrode performance; 2) Inaccurate measurement channel setting; and 3) Inadequate or incorrect electrode calibration.
Solution: 1) Change the electrode with a high performance electrode; 2) Reset the measurement channel; 3) Recalibrate the electrode or change the standard solution.
3. The pH meter is unstable during measurement
Failure factors include: 1) A loose electrode interface; and 2) Instability in measuring pure or desalinated water due to the lack of contaminants and inadequate conductivity.
1) Connect the short-circuit plug to the instrument as part of the troubleshooting process. If the display is steady, think about changing the electrode; otherwise, calibrate using a typical buffer solution.
