Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2005-07-19
2005-07-19
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S071100, C324S721000
Reexamination Certificate
active
06919729
ABSTRACT:
An improved corrosion measurement system for determining the rate of corrosion of a fluid medium. The system is comprised of a highly sensitive excitation and amplification electronic circuitry for registering and displaying the stable and accurate measurement results. A novel current feedback amplifier maintains a constant alternating current voltage across the reference element, by simultaneously controlling the current through the serially connected reference and corroding elements, thereby keeping the corrosivity measurement independent of the probe's ambient temperature. The unique unitized electrical resistance measurement probe is also temperature stabilized using thermally bridged and balanced metallic elements; the first reference element being coated with an impermeable insulating coating, the second, the sacrificial corroding element, being fully exposed to the corrosive fluid medium.
REFERENCES:
patent: 3821642 (1974-06-01), Seymour
patent: 4587479 (1986-05-01), Rhoades et al.
patent: 5243297 (1993-09-01), Perkins et al.
patent: 5627749 (1997-05-01), Waterman et al.
patent: 5854557 (1998-12-01), Tiefnig
patent: WO 00/54027 (2000-09-01), None
Deb Anjan
Dole Timothy J.
Renner John W.
Renner Otto Boisselle & Sklar
Rohrback Cosasco Systems, Inc.
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