Digital converter apparatus for improving the output of a...

Details Digital converter apparatus for improving the output of a... Digital converter apparatus for improving the output of a...

G - Physics

08

C

340/161

G08C 19/04 (2006.01) G08C 19/02 (2006.01)

Patent

CA 1334994

An existing analog two-wire transmitter has a sensor module, an analog excitation circuit, and an analog detector circuit which provides an output representative of a sensed process variable, such a pressure, to a two-wire current loop. The analog detection circuit is removed and replaced with apparatus including a digital converter that digitally calculates the transmitter's output. The output is improved by calculating correction for linearity. The analog excitation circuit may also be replaced with a replacement excitation circuit. The replacement excitation circuit and the digital converter can be energized in series to control energization current. A charge pump can be coupled to the loop to balance the current in the series circuit. The digital converter can also provide electrical span and zero adjustments.

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