COMBINATION pH ELECTRODES EPX-4 / EPX-4U

Zoom

The combination glass electrodes EPX-4 and EPX-4U are used for pH measurements in co-operation with pH meters equipped with BNC-50 connector, they may be also used for continuous measurements in flow in pipelines with use of flow heads available in our offer. The measuring membrane is a round glass bulb made of glass chosen depending on the intended use.

The EPX-4 model is designed for measuremnts in liquids containing strong acids or alkalis (apart from hydrofluoric acid or concentrated NaOH and KOH).

The EPX-4U model may be used for measurements in deionised, pure and ultra pure water.

Teflon junction limits penetration of the measured solution into the electrode and enables good contact with the measured sample what results in accurate and stable measurements and limits the penetration of the measured solution into the electrode.

The reference half cell is separated by an internal electrolytical diaphragma, what creates the ionic barrier. It prevents the silver ions from diffusion to the reference half cell, what in turn limits the chance of clogging of the ceramic diaphragma and interference of the sulfide and cyanide ions from the measured solution. It also limits the interference of the reducing agents such as amines, buffers containing TRIS, sulfites, etc.
To keep the electrode permanently activated, it is equipped with a bottle filled with 3M KCl put on its end, which should be taken off before the measurement.
The electrolyte is in a gel form and it is not refillable.
The electrodes may work in liquids of temperature up to 90°C .