C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
324/23
C23F 13/00 (2006.01) C23F 13/04 (2006.01) G01N 17/02 (2006.01)
Patent
CA 1167924
ABSTRACT Device for measuring the potential with respect to the soil of a metallic structure situated in the soil and cathodically pro- tected by an externally applied DC voltage, consisting of a measuring rod to be driven into the soil near this structure which is provided with a measuring electrode to be connected to the said structure and with a reference electrode, and a measuring circuit for measuring the potential difference between the measuring electrode and the referen- ce electrode. The measuring rod consists of a metallic rod-shaped probe covered over most of its length with a layer of an electrically insulating material and with a small bare part near the end, which forms the measuring electrode. The reference electrode is placed in a transverse bore in the bare part of the rod-shaped probe and electri- cally insulated from the latter. Preferably the reference electrode is a dry electrode, e.g. a zinc-plaster of Paris electrode or a plaster of Paris/copper sulphate-plaster of Paris electrode.
385644
Fetherstonhaugh & Co.
N.v. Nederlandse Gasunie
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