Luggin Capillary

Luggin Capillary for Reduced iR drop Closely position your reference and working electrodes for more accurate voltage measurements Specifications | Gallery | Pricing | Related Products | Technical Support A Luggin capillary is a fine, curved glass tube filled with electrolyte, used to position the tip of a reference electrode as close as possible to the working electrode surface to minimize the uncompensated resistance in electrochemical measurements.The technique was first introduced by an Australian chemist “Hans Luggin”. The term "capillary" refers to the fine bore of the tube; its narrow diameter relies on capillary forces to retain the electrolyte within the tip, preventing gas bubble entrapment and maintaining a stable, continuous ionic pathway between the reference electrode and the working electrode surface.Accurate measurement of the potential between the working and reference electrode is essential for reliable electrochemical data. Any uncompensated resistance, particularly the solution resistance between the working electrode and the reference electrode tip, introduces error into potential measurements, distorting kinetic and mechanistic data. The characteristic curved tip of the Luggin capillary allows the reference electrode to be brought close to the working electrode without physically obstructing current flow, substantially reducing this uncompensated (iR) resistance. The capillary also functions as a secondary junction, physically isolating the reference electrode from the bulk electrolyte. This limits the ingress of reference electrode fill solution ions (such as Ag⁺ or Cl⁻) into the main cell, protecting the working electrolyte from contamination, which can otherwise compromise sensitive electrochemical measurements over time. Available in two lengths, 34 mm and 47 mm, to suit different cell geometries and reference electrode positioning requirements. Please select the Luggin capillary length according to your specific cell model. A new Luggin capillary cannot be retrofitted into cells that were not originally designed with a Luggin capillary port, as the internal dimensions and port structure may not accommodate it. Curved Tip Design Close proximity positioning to the working electrode As a Secondary Junction Reduce main electrolyte contamination Flexibility of Selection Available in 34 mm and 47 mm lengths Compatibility Compatible with standard reference electrode diameter Specifications Product Name Luggin Capillary (34mm) Luggin Capillary (47mm) SKU C2041E1 C2041K1 Length 34 mm 47mm Material Borosilicate Glass Borosilicate Glass Tip/Frit Material Ceramic Ceramic Tip/Frit Diameter 1 mm 1 mm Outer Diameter 2 mm 2 mm Compatible Reference Electrode Diameter All <7 mm All <7 mm Electrolyte Compatibility Not recommend for strongly acidic or alkaline or molten salt electrolytes Not recommend for strongly acidic or alkaline or molten salt electrolytes Diagram of 34 mm and 47 mm Luggin Capillary Tubes Luggin Capillary Gallery Previous Next Pricing and Options Product Name Product Code Price Luggin Capillary (34mm) C2041E1 £30 Luggin Capillary (34mm) - Pack of 5 C2041E1-5 £130 Luggin Capillary (47 mm) C2041K1 £30 Luggin Capillary (47mm) - Pack of 5 C2041K1-5 £130 Related Products Electrochemical Cells Photoelectrochemical Cells Electrodes