Patent ID: 7308825

Claim:
A tank gauging system, for sensing product parameters of a product contained in a tank, comprising: a microwave-based level gauging unit configured to sense a level of said product in the tank through reflection of microwave energy; a temperature gauging unit configured to sense a temperature of said product in the tank; a controller including: an external interface adapted to enable communication between said tank gauging system and an external control system; processing circuitry configured for management of communication over said external interface; and a power supply, which is enclosed in an explosion-proof housing and configured to supply intrinsically safe power to said gauging units, said power supply having an essentially rectangular output characteristic; and an intrinsically safe two-wire bus connecting said controller and said gauging units, wherein the two-wire bus is usable both for transmitting measurement signals related to the sensed product parameters from the gauging units to the controller and for providing intrinsically safe power from the controller to the gauging units.