Luggin Capillary
    

A Luggin capillary is used to position the sensing point of a reference electrode to a desired point in a cell.

The Luggin capillary in a laboratory cell is made from glass or plastic. It is generally filled with the test solution.

The Luggin holds the reference electrode as shown in the picture above. The tip of the Luggin capillary near the working electrode is open to the test solution. The reference electrode senses the solution potential at this open tip.

Note that the Luggin tip is significantly smaller than the reference electrode itself. The Luggin capillary allows sensing of the solution potential close to the working electrode without the adverse effects that occur when the large reference electrode is placed near the working electrode.

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Last revised on Wednesday, June 14, 2006