Conductivity meter electrodes are generally divided into two types: two electrode type and multi electrode type.

　　

The electrode of the two electrode conductivity meter is currently the most commonly used type of conductivity electrode in China. The structure of the electrode of the electrode conductivity meter is to sinter two platinum plates on two parallel glass plates or on the inner wall of a circular glass tube. By adjusting the area and distance of the platinum plates, conductivity meter electrodes with different constant values can be made. Usually there are types such as K=1, K=5, K=10, etc. The two electrode conductivity electrode used on online conductivity meters is often made into a cylindrical symmetrical electrode. When K=1, graphite is often used, and when K=0.1 or 0.01, the material can be stainless steel or titanium alloy. Multi electrode conductive electrodes generally have several ring-shaped electrodes on the support, and different combinations of series and parallel ring-shaped electrodes can be used to make conductive electrodes with different constants. The material of the annular electrode can be graphite, stainless steel, titanium alloy, and platinum.

　　

There are also four electrode types and electromagnetic types of conductive electrodes. The advantage of four electrode conductivity meters is that they can avoid measurement errors caused by electrode polarization, and are commonly used in experimental and online conductivity meters abroad. The characteristic of electromagnetic conductivity electrodes is that they are suitable for measuring high conductivity solutions and are generally used in industrial conductivity meters, or used to make single component concentration meters based on their measurement principles, such as hydrochloric acid concentration meters, nitric acid concentration meters, etc.