Underground Products Selection Guide

Bagged Underground Reference Electrodes, also known as standard design underground reference electrodes, are the original reference electrode design for permanent underground applications. They remain in widespread use today because they have proven long term durability. The reference electrode is contained in a cotton bag filled with bentonite-gypsum backfill. (Models UL, UL50, UR)

Reduced Diameter Underground Reference Electrodes were developed to simplify the installation of permanent underground electrodes in congested locations. They can be installed in a 5 cm (2 inch) diameter bore hole which makes them ideal for retrofit installations beneath paved surfaces. These electrodes are also used beneath aboveground storage tanks and between closely spaced underground storage tanks. (Models US, US50, UD)

Undertank Reference Electrodes are placed in a slotted pipe installed in the sand pad beneath an aboveground storage tank bottom. When tank bottom potentials are needed, the electrode is slowly pulled through the pipe to produce a potential profile. (Model UT)

Cathodic Protection Coupons permit the measurement of IR drop free potentials on all types of underground cathodic protection systems (sacrificial and impressed current). (Models ULI, USI, UI-MS, UC)

Custom Underground Products Electrochemical Devices, Inc. works with design and corrosion engineers to produce reference electrodes for those applications where our standard models may require modification. We do not charge design fees for this service and in most cases the custom product is priced comparably to a similar standard product. (Model UX)