7 common problems of inaccurate online pH meter measurement
1. "E.rr" appears on the screen of the online pH meter transmitter?
Answer: PH is out of range. Possibly: The indicator electrode wiring is disconnected.
2. The number of the online ph meter transmitter jumps randomly, which does not match the water quality?
Answer: It may indicate that the reference wiring is leaking, try to wipe the wiring terminal with absolute alcohol, and keep the humidity at the wiring to meet the technical requirements.
3. The online pH transmitter has no control signal output?
Answer: Check whether the screen is in normal mode.
4. Do you feel that the measured value of the online transmitter is inaccurate?
Answer: Take out the electrode of the online pH meter, clean it and calibrate it according to the instructions. If it cannot be calibrated during the calibration process of the pH meter, please try to replace the electrode.
5. Electrode response is slow?
Answer: When the temperature is low, the internal resistance of the electrode increases and the reaction will be slower. When the bulb is covered by dirt, the liquid junction is blocked by dirt, and the reaction will slow down. Please try to clean the electrode.
6. Does the pH of the electrode change in any solution?
Answer: The bulb of the electrode has been broken, and the electrode needs to be replaced. The connection between the electrode and the instrument is off, please check. The electrode cable is internally broken, please replace or send back for repair.
7. Is the pH value of the two measurements different for the same sample?
Answer: The temperature change or the chemical reaction of the sample itself caused the change of pH value. Therefore, try to keep the temperature consistent and avoid chemical reactions.
