When the dielectric liquid level is 2 centimeters lower than the filling hole, new dielectric liquid should be replenished in a timely manner.

The characteristic of non rechargeable pH composite electrodes is simple maintenance and convenient use, therefore, they have also been widely used. However, when used as a pH electrode in the laboratory, under long-term and continuous usage conditions, the concentration of KCl at the liquid interface will decrease, affecting the testing accuracy. Therefore, when non rechargeable pH composite electrodes are not used, they should be immersed in electrode immersion solution, so that the electrode performance will be good during the next test. However, some laboratory pH electrodes are not tested for long-term or continuous testing, so the impact of this structure on accuracy is relatively small. Industrial pH composite electrodes, due to their low requirements for testing accuracy, have become the main choice for ease of use.