Reasons for inaccurate readings on Mettler pH meters
What causes inaccurate readings on a Mettler pH meter? Many people recognise that there is a problem with Mettler pH meter or Mettler pH electrode, but in many cases, it is due to improper operation or other external conditions caused by the following Mettler Instruments Network may cause some of the reasons for inaccurate readings of Mettler pH meter, I hope to be helpful to the majority of users.
First, Mettler pH meter or pH electrode damage
If we use a METTLER pH meter to measure the pH value of METTLER standard buffer solution, pH meter readings do not change, such as METTLER acidity meter FE20K to measure the pH value of METTLER pH4.01 buffer solution and METTLER pH7.0 buffer solution, the FE20K to maintain readings unchanged, if the power supply and the electrode cable is connected correctly, then it is shown that the FE20K host or the standard configuration of pH electrode LE438 have problems, need to repair the host or pH electrode.
Second, Mettler pH electrode failure
As mentioned in the first point above, it is possible that the LE438 electrode is inactive and needs to be activated, after activation, it will be back to normal, the specific operation steps, you can refer to Mettler Instruments before the introduction of the pH electrode activation.
Third, the temperature or the sample itself changes caused by the inaccuracy of the Mettler pH meter measurement readings
Sometimes, we measure the pH value of a sample at a certain point in time, after a pH data, after a period of time, and then take the same sample for measurement, it is possible that the pH value will be changed, before Mettler Instruments Network has received a similar call. This is mainly due to the temperature or the sample itself caused by changes, which need to keep the temperature of the measurement environment constant, after the measurement of volume change samples, pay attention to save.
Fourth, Mettler pH meter calibration improperly caused by the difference in readings
In the calibration of Mettler pH meter, if you choose the wrong calibration buffer group, or not at 25 ℃ when the calibration is also not temperature compensation, it will make the difference in the measured value.
