Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1979-09-26
1981-08-04
Krawczewicz, Stanley T.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
324204, G01N 2702
Patent
active
042824877
ABSTRACT:
A hydrocarbon detection system is provided for use in a subsea hydrocarbon production installation which includes production tree assemblies, an electro-hydraulic control module located on the sea floor and remote from the production trees, cable assemblies interconnecting the control module with the production trees through magnetic coupling devices. A pair of inductive elements are electrically coupled by the surrounding sea water. Displacement of the conductive sea water by escaping hydrocarbons affects the coupling between the inductive elements to produce a hydrocarbon-presence-responsive output signal. The inductive elements are resonated within a selected frequency range by capacitors coupled with a primary inductor coil by auxiliary windings on a common core element. An excitation signal sweeps over the selected frequency range at a rate effective to produce a peak detected signal at the resonant frequency. The peak output signal is then monitored to form a control signal functionally related to the presence or absence of hydrocarbons in the sea water.
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Marosko Ronald J.
Warren Walter B.
Connors John J.
DeWitt Ben
Krawczewicz Stanley T.
TRW Inc.
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