Patent ID: 7183778

Claim:
An apparatus for measuring fluid resistivity, comprising: being adapted to be in fluid communication with formation fluids, wherein the flow line includes a first section comprising a first conductive area, a second section comprising a second conductive area, and an insulating section disposed between the first and the second section to prevent direct electrical communication between the first section and the second section, wherein the first conductive area and the second conductive area are configured to contact a fluid contained in the flow line such that, together with a conductive path disposed outside the flow line, a current return loop is formed; a first toroid and a second toroid surrounding the flow line, wherein the first toroid is configured to induce an electrical current in the fluid in the flow line and the second toroid is configured to measure the electrical current induced in the fluid in the flow line; and an electronic package to control functions of the first toroid and the second toroid.