G - Physics – 01 – L
Patent
G - Physics
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G01L 27/00 (2006.01) G01L 9/00 (2006.01) G01L 9/06 (2006.01) G01L 9/12 (2006.01) G01L 19/00 (2006.01) G01L 19/02 (2006.01) G01L 19/04 (2006.01)
Patent
CA 2133732
ABSTRACT OF THE DISCLOSURE A two-wire transmitter includes a pressure sensor comprising first and second sensing means each having an impedance value which varies with pressure being measured and with a predetermined environmental condition, such as line pressure or temperature. A fixed impedance has an impedance value which is substantially unchanged by variations in the predetermined environmental condition. switch alternately connects the fixed impedance into operative relation with the first and second sensing means to derive first and second signals which are each functions of pressure being measured and the predetermined environmental condition. A correction circuit processes the first and second signals, such as by a polynomial series or with a lookup table, to derive a corrected pressure signal.
Frick Roger L.
Munson Gregory S.
Marks & Clerk
Rosemount Inc.
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