G - Physics – 08 – C
Patent
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.
548261
Kielb John A.
Nelson Richard L.
Pederson David L.
Marks & Clerk
Rosemount Inc.
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