What are the differences between rechargeable and non-rechargeable combined pH electrodes?
The pH composite electrode casing is distinguished between plastic and glass. A rechargeable pH composite electrode has a liquid addition hole on the electrode casing. When the external reference solution of the electrode is lost, the liquid addition hole can be opened to replenish KCl solution. The non rechargeable pH composite electrode is filled with gel like KCl, which is not easy to drain and has no feeding hole.
The characteristics of rechargeable pH composite electrodes are that the reference solution has a high permeation rate, the liquid interface potential is stable and reproducible, and the measurement accuracy is high. And when the reference electrode is reduced or contaminated, KCl solution can be replenished or replaced, but the disadvantage is that it is more difficult to use. When using rechargeable pH composite electrodes, the filling hole should be opened to increase liquid pressure and accelerate electrode response. When the electrolyte level is 2 centimeters below the filling hole, new electrolyte should be replenished in a timely manner.
The characteristic of non rechargeable pH composite electrodes is that they are easy to maintain and use, and therefore have been widely used. However, when used as a laboratory pH electrode, under long-term and continuous usage conditions, the concentration of KCl at the liquid interface will decrease, affecting the accuracy of the test. Therefore, when non rechargeable pH composite electrodes are not in use, they should be immersed in electrode soaking solution, so that the electrode performance will be good in the next test. However, some laboratory pH electrodes are not tested continuously for a long time, so this structure has a relatively small impact on accuracy. However, industrial pH composite electrodes have relatively low requirements for testing accuracy, so ease of use has become the main choice.
