New reference design extends pH sensor life

Solid Polymer Reference

Recently launched at Achema, Frankfurt, Germany, the new Permalyte™ reference design from Broadley-James Corporation can extend pH electrode life, especially in the more difficult process applications.

Conventional pH electrode designs utilise a porous material to make the connection between the pH sensor internal reference electrode and the process solution.  This junction material can be ceramic, porous Teflon, or a similar material.  However they all suffer from blockage or blinding by the process and also provide a pathway for the process to interact with the internal chemistry of the sensitive reference half cell, shortening the life of the pH sensor.

The Broadley-James Permalyte™ design differs from the conventional by eliminating the porous reference junction altogether.  Instead the reference electrolyte, which is usually a liquid or gel, is replaced with a solid polymer.  Connection through the body of the sensor to the process solution is via an open junction.  There is no porous material to block or blind and the sensitive reference electrode half cell is protected from the process by the electrolyte being immobilised into a solid polymer.

Broadley-James Permalyte™ pH electrodes are best suited to more difficult, heavily contaminated process solutions, such as emulsions and suspensions in effluent channels, neutralisation tanks, aeration basins and general industrial processes.

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