公开(公告)号：CA2233018A1

公开(公告)日：1997-04-03

申请号：CA2233018

申请日：1996-09-13

Applicant: ROSEMOUNT INC

Inventor： SCHULTE JOHN P ,  TEWFIK AHMED H ,  FRICK ROGER L

IPC: G08C19/02 ,  G08C19/10 ,  G08C15/00 ,  G05B11/32

Abstract: A transmitter (10) in a process control system includes input/output circuitry (74) for coupling to a process control loop (12). A first sensor (40L) having a first impedance is responsive to a first sensed parameter. A second sensor (40H) having a second impedance is responsive to a sensed parameter. First and second excitation signals (S1, S2) are applied to the first and second sensors (40L, 40H). A summing node (44) sums the outputs (OL, OH) of the first and second sensors (40L, 40H). An analog to digital converter (54) provides a digital output representative of the summed signals. Digital signal processing circuitry (70) coupled to the analog to digital converter (54) provides an output related to the outputs (OL, OH) of the first and second sensors (40L, 40H) to the input/output circuitry (72) for transmission over the process control loop (12).

公开(公告)号：AU4025001A

公开(公告)日：2001-04-30

申请号：AU4025001

申请日：2000-09-22

Applicant: ROSEMOUNT INC

Inventor： KLEVEN LOWELL A ,  TEWFIK AHMED H

IPC: G08C15/00 ,  G01D21/00 ,  G05B13/04 ,  G05B19/042 ,  G05B23/02 ,  G06F17/10 ,  G06F17/17 ,  G08C13/00 ,  G08C19/02 ,  G05B19/418

Abstract: A transmitter for measuring a process variable includes a sensor configured to couple to a process and having a sensor output related to the process variable. A microprocessor coupled to the sensor output provides a process variable output which is a function of an orthogonal-polynomial of the sensor output. A transmitter output is configured to provide an output related to the process variable.

公开(公告)号：BR9610644A

公开(公告)日：1999-05-18

申请号：BR9610644

申请日：1996-09-13

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P ,  TEWFIK AHMED H

IPC: G08C19/02 ,  G08C19/10

Abstract: A transmitter in a process control system includes input/output circuitry for coupling to a process control loop. A first sensor having a first impedance is responsive to a first sensed parameter. A second sensor having a second impedance is responsive to a sensed parameter. First and second excitation signals are applied to the first and second sensors. A summing node sums the outputs of the first and second sensors. An analog to digital converter provides a digital output representative of the summed signals. Digital signal processing circuitry coupled to the analog to digital converter provides an output related to the outputs of the first and second sensors to the input/output circuitry for transmission over the process control loop.