Level gauging system

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters

Reexamination Certificate

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C324S639000, C342S124000

Reexamination Certificate

active

07053630

ABSTRACT:
A radar level gauge for measuring the level of a surface of a product stored in a tank by use of radar. The radar transmits microwaves towards the surface and receives microwaves reflected by the surface and is adapted to transmit and receive microwaves within two widely separated frequency bands. Widely separated frequency bands are chosen to utilize the differences in attenuation due to foam on the surface and the differences in beam-width or other disturbances. The ratio between the center frequencies of the two widely separated frequency bands can be quantified as at least greater than 1.5:1 or preferably greater than 2:1.

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