The pH electrodes were designed over 100 years ago. First glass electrode was designed by a polish physicist Zygmunt Klemensiewicz. For many years a set consisting of the separate measuring and reference electrodes was used. Now days, in most cases, the pH electrodes are offered as a one combination electrode. In one electrode body both the measuring and the reference electrodes were placed.
Elektroda pH IJ44A The offered electrodes differ in their purpose and the construction details. It is very important to choose the right type of the electrode for the kind of measured sample. Wrong choice may result in unstable results, shortened lifetime and sometimes in total irreversible destroying of the electrode.
The differences in the electrode's constructions are connected with the different purposes of their use. There are different pH electrodes for the deionised water measurements, different for the clean water and different for the waste water, semi-solid substances, soil, food products or chemical compounds.
Electrodes offered for measurements in temperatures above 100 °C have different type of the glass than the standard electrodes which usually can work in temperatures 50 to 80 °C. There are huge differences in the construction of the electrolytic junction (diaphragm) which ensures the contact between the measured solution and the reference half cell. Most often a ceramic junction is used, now days electrodes with Teflon junction are getting popular as they have many advantages over standard types of junctions.
The electrodes designed for the continuous measurements in the industrial applications are characterised by a better resistance to higher pressure and a better self-cleaning of the membrane.
Elmetron offers a wide range of pH electrodes chosen accordingly to the purpose.

Detailed description of the electrodes after choosing the type.

- standard glass pH electrode, for clean water measurements
- standard pH electrode with plastic body, for clean water measurements
- standard pH electrode with plastic body, built-in temperature sensor, for clean water measurements
- glass pH electrode, for temperatures up to 120°C
- pH electrodes in plastic body, for waste water, pastes, paints, milk, with special sleeve protecting the junction against its clogging
- glass pH electrodes for liquids with average amount of sediments, for example effluent
- glass pH electrode, for measurements in samples with water content below 5% like oil, fat, with the ion barrier
- glass pH electrode, with movable glass sleeve junction (glass cut), for deionised water, shampoos, pastes, paints etc.
- pH electrode with plastic body, for flat surfaces like skin, leather, paper, Petri dishes and small volumes
- glass pH electrode, for small volumes (from 0.4ml)
- glass pH electrode in steel knife for meat measurements
- glass pH electrodes, for deionised, ultra pure water (EPX-4U), acids, alkalies and chemical compounds and wastes (EPX-4)
- pH electrode for samples containing hydro fluoride (HF) acid, plastic body
- head for pH meters of 105 series, glass in plastic body, with Ionode electrode, for water with deposits, waste water, pastes, soil etc.
- head for pH meters of 105 series, for samples with low deposits content