G - Physics – 01 – N
Patent
G - Physics
01
N
324/23
G01N 17/00 (2006.01) C23F 13/04 (2006.01) G01N 17/02 (2006.01)
Patent
CA 1170718
AE 3227 ABSTRACT Process and apparatus for monitoring the potential with respect to the soil of a metallic structure situated in the soil and cathodically protected by an externally applied DC voltage. A measuring electrode situated adjacent to this structure in the soil is electri- cally connected to the structure and to a measuring circuit with which the potential difference between the measuring electrode and a reference electrode placed on or in the soil is measured. The measured potential is continuously compared during a measuring cycle of, e.g., one month with a set reference potential corresponding to the desired protection potential in a comparison circuit. The amount by which the measured potential is higher than the reference potential is converted into a pulsed signal the frequency of which is proportional to the said amount and the number of pulses during the measuring cycle is counted in a pulse counter, the time interval between the start and end of a measuring cycle is recorded and after the measuring cycle the average value of the amount by which the measured potential has been higher than the reference potential during the measuring cycle is deter- mined from the number of pulses counted in the pulse counter and the recorded time interval.
385648
Fetherstonhaugh & Co.
N.v. Nederlandse Gasunie
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