Model CW - Potential Well (Long)

Typical Application:

Bridge decks and substructures, parking garages, docks, and buildings

Featuring:

No need to wet down the surface to take potential readings on rebars
Ability to take potential readings under surfaces covered with a membrane or sealer
Elimination of errors from reading through a carbonated surface layer
Fixed location for consistency in comparing data with previous readings
Salt bridge (Luggin) extension permits measurement of a remote location

Housing Specifications 1 1/2" dia. PVC fitting Pipe plug with 9/16" hex socket	Model Designation Specify as EDI Model CW-HOL-Lnnx nn = extension length in feet x = B for black plug, Y for yellow plug
Extension Specifications 1/4" dia. X 8 ft. long HDPE Cotton bag with special backfill PP compression union for greater lengths

Application Notes:

The Long Potential Well is intended for use where it is best to take a potential reading on a rebar with a portable reference electrode from a remote location. As an example, this model with the standard 8 ft. extension permits potentials to be taken under a traffic lane from an access point on the sidewalk. Longer extensions are available if required. The Model CW can also be used to calibrate a permanent embedded reference electrode by placing the sensing bulb adjacent to the permanent electrode. For proper installation, the sensing bulb should be placed as close as possible to the rebar where measurements are to be taken. Ideally, there should be a layer of the original concrete between the sensing bulb and the rebar. To take readings: remove the threaded plug with the hex socket, wet the foam, and then press a calibrated portable reference electrode into the foam. For those installations where it is possible to take potential readings directly over the rebar, a short version of this model is available. See the EDI Data Sheet for the Potential Well (Short), Model CW-HOL-Sx.