Flow metering
AssigneeABB Kent-Taylor Limited
InventorsJohn Coulthard, Rui Xue Cheng
Life of this patent
Estimating the term…
Abstract
A method of measuring a characteristic of a flowing fluid comprising measuring said characteristic by means of two or more sensors which have differing responses to a variable affecting said measurement, and combining the outputs (as herein defined) of the sensors, so that the differences in the responses thereof cancel each other and the combined output is substantially independent of said variable.
Claims12
A method of measuring a concentration characteristic of a flowing fluid comprising providing two or more sensors in a flow passage for the fluid and in sensing relation to the flowing fluid, said sensors having differing responses to a spatial variable affecting measurement of the characteristic, measuring the characteristic by means of the two sensors, and applying the outputs of the sensors to a signal combiner in which the outputs are subtracted, so that the differences in the responses thereof cancel each other and the combined output is substantially independent of said spatial variable affecting said measurement.
Apparatus for measuring a concentration characteristic of a flowing fluid comprising at least two sensors for measuring said characteristic, said sensors having differing responses to a spatial variable affecting said measurement, and a signal combiner operatively connected to the outputs of the sensors for combining the outputs of the sensors and for subtracting the outputs, so that the differences in the responses thereof cancel each other out and the combined output is substantially independent of said spatial variable affecting said measurement.
Dependencies are inferred from the claim text.