公开(公告)号：AU2003214897A8

公开(公告)日：2003-09-09

申请号：AU2003214897

申请日：2003-01-27

Applicant: ROSEMOUNT INC

Inventor： WANG RONGTAI

IPC: G01L9/00 ,  G01D1/00 ,  G01R27/26 ,  G01D5/241 ,  G01L9/12

Abstract: A pair of sensing capacitors, each having a capacitance C1 and C2 respectively, based on a process variable, are coupled to a bridge node which is coupled to a summing node. A reference capacitor, coupled to the summing node, has a capacitance CREF greater than an expected maximum difference between the capacitances of the pair of sensing capacitors. Switches selectively couple the sensing capacitors and the reference capacitor to at least first and second voltages to derive charges representative of C1-C2 and CREF. In one embodiment the sensing capacitors are operated to charge and discharge during respective first and second phases of first cycles and the reference capacitor is operated to charge and discharge during respective first and second phases of second cycles. In another embodiment, the reference capacitor is operated to charge and discharge during alternate phases of the first and second cycles and the sensing capacitors are operated to charge and discharge during respective first and second phases of all cycles.

公开(公告)号：AU2003294686A8

公开(公告)日：2004-07-29

申请号：AU2003294686

申请日：2003-12-15

Applicant: ROSEMOUNT INC

Inventor： WANG RONGTAI

IPC: G01D3/08 ,  G01D21/00 ,  G01R31/28 ,  G05B23/02 ,  G06F11/00 ,  G06F11/30 ,  G06F15/00 ,  G06F19/00 ,  H04L20060101

Abstract: A field transmitter for transmitting signals representative of process variables has both a normal operating mode and a diagnostic self-test mode. The field transmitter has a physical sensor for sensing a process variable and generating a physical sensor signal which is representative of the process variable. A signal processing circuit converts the sensor signal to a measurement which is transmitted to a control room. The field transmitter also has a surrogate sensor for producing a surrogate sensor signal which is independent of the process variable. During the diagnostic self-test mode, the surrogate sensor is connected to the signal processing circuit in place of the physical sensor. If the output of the signal processing circuit does not correspond to an expected value, a diagnostic code is produced.

公开(公告)号：DE10392352T5

公开(公告)日：2005-05-19

申请号：DE10392352

申请日：2003-01-27

Applicant: ROSEMOUNT INC

Inventor： WANG RONGTAI

IPC: G01L9/00 ,  G01D1/00 ,  G01R27/26 ,  G01D5/24

Abstract: A pair of sensing capacitors, each having a capacitance C1 and C2 respectively, based on a process variable, are coupled to a bridge node which is coupled to a summing node. A reference capacitor, coupled to the summing node, has a capacitance CREF greater than an expected maximum difference between the capacitances of the pair of sensing capacitors. Switches selectively couple the sensing capacitors and the reference capacitor to at least first and second voltages to derive charges representative of C1-C2 and CREF. In one embodiment the sensing capacitors are operated to charge and discharge during respective first and second phases of first cycles and the reference capacitor is operated to charge and discharge during respective first and second phases of second cycles. In another embodiment, the reference capacitor is operated to charge and discharge during alternate phases of the first and second cycles and the sensing capacitors are operated to charge and discharge during respective first and second phases of all cycles.

公开(公告)号：AU2003214897A1

公开(公告)日：2003-09-09

申请号：AU2003214897

申请日：2003-01-27

Applicant: ROSEMOUNT INC

Inventor： WANG RONGTAI

IPC: G01L9/00 ,  G01D1/00 ,  G01R27/26 ,  G01D5/00

Abstract: A pair of sensing capacitors, each having a capacitance C1 and C2 respectively, based on a process variable, are coupled to a bridge node which is coupled to a summing node. A reference capacitor, coupled to the summing node, has a capacitance CREF greater than an expected maximum difference between the capacitances of the pair of sensing capacitors. Switches selectively couple the sensing capacitors and the reference capacitor to at least first and second voltages to derive charges representative of C1-C2 and CREF. In one embodiment the sensing capacitors are operated to charge and discharge during respective first and second phases of first cycles and the reference capacitor is operated to charge and discharge during respective first and second phases of second cycles. In another embodiment, the reference capacitor is operated to charge and discharge during alternate phases of the first and second cycles and the sensing capacitors are operated to charge and discharge during respective first and second phases of all cycles.

公开(公告)号：DE10392352B4

公开(公告)日：2010-08-19

申请号：DE10392352

申请日：2003-01-27

Applicant: ROSEMOUNT INC

Inventor： WANG RONGTAI

IPC: G01D5/24 ,  G01L9/00 ,  G01D1/00 ,  G01R27/26

公开(公告)号：AU2003294686A1

公开(公告)日：2004-07-29

申请号：AU2003294686

申请日：2003-12-15

Applicant: ROSEMOUNT INC

Inventor： WANG RONGTAI

IPC: G01D3/08 ,  G01D21/00 ,  G01R31/28 ,  G05B23/02 ,  G06F11/00 ,  G06F11/30 ,  G06F15/00 ,  G06F19/00 ,  H04L20060101

Abstract: A field transmitter for transmitting signals representative of process variables has both a normal operating mode and a diagnostic self-test mode. The field transmitter has a physical sensor for sensing a process variable and generating a physical sensor signal which is representative of the process variable. A signal processing circuit converts the sensor signal to a measurement which is transmitted to a control room. The field transmitter also has a surrogate sensor for producing a surrogate sensor signal which is independent of the process variable. During the diagnostic self-test mode, the surrogate sensor is connected to the signal processing circuit in place of the physical sensor. If the output of the signal processing circuit does not correspond to an expected value, a diagnostic code is produced.

公开(公告)号：WO2016149130A3

公开(公告)日：2016-12-15

申请号：PCT/US2016022140

申请日：2016-03-11

Applicant: ROSEMOUNT INC

Inventor： WANG RONGTAI ,  SCHULTE JOHN PAUL

IPC: G01R27/26 ,  G01D5/24 ,  H03M3/02

CPC classification number: H03M3/39 ,  G01D5/24 ,  G01L9/0072 ,  G01L9/0075 ,  G01L9/12 ,  H03M3/356 ,  H03M3/376 ,  H03M3/494

Abstract: A single plate capacitance sensor includes a sensor capacitor and a reference capacitor that share common plate. A capacitance-to-digital sigma delta modulator provides separate sensor excitation and reference excitation signals to the sensor capacitor and the reference capacitor to provide high resolution detection. Programmable ratio-metric excitation voltages and adaptive excitation voltage sources can be used to enhance modulator performance.

Abstract translation: 单板电容传感器包括传感器电容器和共用共用板的参考电容器。 电容数字Σ-Δ调制器向传感器电容器和参考电容器提供单独的传感器激励和参考激励信号，以提供高分辨率检测。 可编程比率公制激励电压和自适应激励电压源可用于增强调制器性能。

公开(公告)号：WO2004062170A8

公开(公告)日：2004-11-18

申请号：PCT/US0339848

申请日：2003-12-15

Applicant: ROSEMOUNT INC

Inventor： SCHULTE JOHN P ,  WANG RONGTAI

IPC: G01D3/08 ,  G01D21/00 ,  G01R31/28 ,  G05B23/02 ,  G06F11/00 ,  G06F11/30 ,  G06F15/00 ,  G06F19/00 ,  H04L20060101

CPC classification number: G01D3/08 ,  G01D21/00 ,  G05B23/0221

Abstract: A field transmitter (10) for transmitting signals representative of process variables has both a normal operating mode and a diagnostic self-test mode. The field transmitter (10) has a physical sensor (12,14) for sensing a process variable and generating a physical sensor signal which is representative of the process variable. A signal processing circuit (22,24) converts the sensor signal to a measurement which is transmitted to a control room. The field transmitter (10) also has a surrogate sensor (16,18) for producing a surrogate sensor signal which is independent of the process variable. During the diagnostic self-test mode, the surrogate sensor is connected to the signal processing circuit (22,24) in place of the physical sensor (12,14). If the output of the signal processing circuit (22,24) does not correspond to an expected value, a diagnostic code is produced.

Abstract translation: 用于发送表示过程变量的信号的场发射机（10）具有正常操作模式和诊断自检模式。 现场发射机（10）具有用于感测过程变量并产生代表过程变量的物理传感器信号的物理传感器（12,14）。 信号处理电路（22,24）将传感器信号转换成传输到控制室的测量值。 现场发射机（10）还具有用于产生独立于过程变量的代理传感器信号的代理传感器（16,18）。 在诊断自检模式期间，替代传感器连接到信号处理电路（22,24），代替物理传感器（12,14）。 如果信号处理电路（22,24）的输出不符合期望值，则产生诊断代码。

公开(公告)号：WO2016149130A4

公开(公告)日：2017-02-23

申请号：PCT/US2016022140

申请日：2016-03-11

Applicant: ROSEMOUNT INC

Inventor： WANG RONGTAI ,  SCHULTE JOHN PAUL

IPC: G01R27/26 ,  G01D5/24 ,  H03M3/02

CPC classification number: H03M3/39 ,  G01D5/24 ,  G01L9/0072 ,  G01L9/0075 ,  G01L9/12 ,  H03M3/356 ,  H03M3/376 ,  H03M3/494

Abstract: A single plate capacitance sensor includes a sensor capacitor and a reference capacitor that share common plate. A capacitance-to-digital sigma delta modulator provides separate sensor excitation and reference excitation signals to the sensor capacitor and the reference capacitor to provide high resolution detection. Programmable ratio-metric excitation voltages and adaptive excitation voltage sources can be used to enhance modulator performance.

Abstract translation: 单板电容传感器包括传感器电容器和共用共用板的参考电容器。 电容数字Σ-Δ调制器向传感器电容器和参考电容器提供单独的传感器激励和参考激励信号，以提供高分辨率检测。 可编程比率公制激励电压和自适应激励电压源可用于增强调制器性能。

公开(公告)号：WO2004062170A2

公开(公告)日：2004-07-22

申请号：PCT/US0339848

申请日：2003-12-15

Applicant: ROSEMOUNT INC

Inventor： WANG RONGTAI ,  SCHULTE JOHN P

IPC: G01D3/08 ,  G01D21/00 ,  G01R31/28 ,  G05B23/02 ,  G06F11/00 ,  G06F11/30 ,  G06F15/00 ,  G06F19/00 ,  H04L20060101 ,  H04L

CPC classification number: G01D3/08 ,  G01D21/00 ,  G05B23/0221

Abstract: A field transmitter (10) for transmitting signals representative of process variables has both a normal operating mode and a diagnostic self-test mode. The field transmitter (10) has a physical sensor (12,14) for sensing a process variable and generating a physical sensor signal which is representative of the process variable. A signal processing circuit (22,24) converts the sensor signal to a measurement which is transmitted to a control room. The field transmitter (10) also has a surrogate sensor (16,18) for producing a surrogate sensor signal which is independent of the process variable. During the diagnostic self-test mode, the surrogate sensor is connected to the signal processing circuit (22,24) in place of the physical sensor (12,14). If the output of the signal processing circuit (22,24) does not correspond to an expected value, a diagnostic code is produced.

Abstract translation: 用于传输表示过程变量的信号的现场变送器（10）具有正常操作模式和诊断自测试模式。 现场变送器（10）具有物理传感器（12,14），用于感测过程变量并产生表示过程变量的物理传感器信号。 信号处理电路（22,24）将传感器信号转换成传送给控制室的测量值。 场发射器（10）还具有用于产生独立于过程变量的替代传感器信号的替代传感器（16,18）。 在诊断自检模式期间，替代传感器连接到信号处理电路（22,24）以代替物理传感器（12,14）。 如果信号处理电路（22,24）的输出不符合期望值，则产生诊断代码。