JBL pH-Control, JBL pH-Sensor: What deviations are common when calibrating and how do they correlate with the temperature?
It is difficult to give a precise answer without information about the sensor, particularly the age of the sensor. Good sensors have deviations in the range from 0.02 to 0.05 pH levels when calibrating.
The input voltage differs for each electrode, as each electrode has its own individual properties. For the majority of our electrodes, it is between -30 and +30 mV at pH 7.
Both input voltages (pH 7 and pH 4) are important when assessing the quality of an electrode. The greater the difference between these two values, the better the electrode and the precision of the measurement and control. The differences should be over 140-150 mV.
The temperature sensor should always be used during calibration. The pH level varies according to temperature, so that it is always best to measure the pH level with temperature compensation.