公开(公告)号：WO9208279A3

公开(公告)日：1992-06-25

申请号：PCT/US9107866

申请日：1991-10-24

Applicant: ROSEMOUNT INC

Inventor： JARAMILLO RAFAEL ,  FRICK ROGER L ,  CARLSON KAREN B ,  PASCHKE RANDY K ,  THRONE CHRISTOPHER M

IPC: G01D3/024 ,  G01D3/02 ,  G01D3/028 ,  G08C19/02

CPC classification number: G01D3/022 ,  G08C19/02

Abstract: A process variable transmitter (50) which has a manual adjustment (60) for span and zero or the like. The adjustment (60) has a finer adjustment range where the output changes responsive to changes in the position of the adjustment. The adjustment has a coarse range where the transmitter output changes automatically as a function of time to provide coarser adjustment. An operator can move the adjustment back and forth between the adjustment ranges until a desired output value is observed. When adjustment is complete, the operator can manually select the desired transmitter output value and then a selection circuit (68) stores the setting in non-volatile memory (66, 13). After a setting is stored, the transmitter output is not sensitive to movement of the manual adjustment (60), but is instead controlled by the stored setting.