公开(公告)号：EP1163492A4

公开(公告)日：2004-09-22

申请号：EP00910193

申请日：2000-02-15

Applicant: REDWOOD MICROSYSTEMS INC

Inventor： HARRIS JAMES M ,  TAHERI BABAK ,  ARKILIC ERROL

IPC: G01D3/028 ,  G01D18/00 ,  G01L19/04 ,  G01L27/00

CPC classification number: G01L27/005 ,  G01D3/022 ,  G01D18/008 ,  G01L9/065

Abstract: A sensor drift correction apparatus (20) includes a sensor package (22) which includes a fluid conduit (24), a proportional controller (26), a temperature sensor (28), a first pressure sensor (30), an integral controller (32) and a second pressure sensor (34). Bus (36) connects first pressure sensor (30), etc. to a micro-controller (38) having an associated internal or external memory (40). Included in memory (40) are an initial parameter specification module (42), a standard mode control module (44), a calibration condition identification module (46), a sensor drift calculation module (48) and a sensor drift adjustment mode operation module (50) which together act to identify a calibration command, identify a nominal zero pressure drift correction factor for sensor (30, 34) by relying upon a calibration voltage value and a calibration temperature value secured at nominal zero pressure condition, and subsequently adjusting sensor output accordingly.