Regarding the selection and usage methods of pH meter probes
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It turns out that the probe of the alkaline pH meter is damaged. There is a probe in the warehouse; when it’s installed, it only shows a reading of 7, and that number stays fixed without changing. Could you please tell me why this is happening? Waiting online, urgently~!
It should be fine by now. Are your transmitter and sensor from the same brand?
Use a multimeter to measure the impedance between the measuring electrode and the reference electrode of the pH electrode; if it is below 20 MΩ, the electrode is damaged. A reading of pH 7 indicates that the electrode potential is close to 0 mV. Also check whether the type of temperature element for the electrode is set correctly.
Thank you all for your replies. I tried the methods you suggested, and yes, it’s working now~! It can be used now; perhaps it’s a quality issue with the sensor, as the measurement values are a bit low
A pH electrode generally can only be used for about 1 year. If it is a type with replaceable electrolyte, in order to determine whether the pH is normal, it is necessary to use a standard solution for testing; do not assume that the pH of the liquid itself is 7