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公开(公告)号：US10320535B2
公开(公告)日：2019-06-11
申请号：US14871850
申请日：2015-09-30
Applicant: Rosemount Inc.
Inventor： Steven John McCoy , David Richard Lauzon
Abstract: A two-wire process variable transmitter for use in an industrial process includes a process variable sensor configured to sense a process variable of a process fluid of the industrial process. Output circuitry provides an output on a two-wire process control loop which is related to the sensed process variable. Terminal voltage measurement circuitry measures a voltage at terminals of the process variable transmitter. The terminal voltage is a voltage measured across an electrical connection of the two-wire process variable transmitter to the two-wire process control loop. A microprocessor performs loop diagnostics on the two-wire process control loop based upon a loop current and the measured terminal voltage. The microprocessor determines coefficients of a polynomial equation which relates loop current and terminal voltage during normal operation of the two-wire process variable transmitter and performs subsequent diagnostics based upon the coefficients of the polynomial.
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公开(公告)号：US20170093533A1
公开(公告)日：2017-03-30
申请号：US14871850
申请日：2015-09-30
Applicant: Rosemount Inc.
Inventor： Steven John McCoy , David Richard Lauzon
CPC classification number: H04L1/24 , G05B11/012 , G05B19/0423 , G05B2219/24069 , G08C19/02 , H04L12/40169 , H04L43/0847 , H04Q9/00
Abstract: A two-wire process variable transmitter for use in an industrial process includes a process variable sensor configured to sense a process variable of a process fluid of the industrial process. Output circuitry provides an output on a two-wire process control loop which is related to the sensed process variable. Terminal voltage measurement circuitry measures a voltage at terminals of the process variable transmitter. The terminal voltage is a voltage measured across an electrical connection of the two-wire process variable transmitter to the two-wire process control loop. A microprocessor performs loop diagnostics on the two-wire process control loop based upon a loop current and the measured terminal voltage. The microprocessor determines coefficients of a polynomial equation which relates loop current and terminal voltage during normal operation of the two-wire process variable transmitter and performs subsequent diagnostics based upon the coefficients of the polynomial.
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公开(公告)号：US10367612B2
公开(公告)日：2019-07-30
申请号：US14871850
申请日：2015-09-30
Applicant: Rosemount Inc.
Inventor： Steven John McCoy , David Richard Lauzon
Abstract: A two-wire process variable transmitter for use in an industrial process includes a process variable sensor configured to sense a process variable of a process fluid of the industrial process. Output circuitry provides an output on a two-wire process control loop which is related to the sensed process variable. Terminal voltage measurement circuitry measures a voltage at terminals of the process variable transmitter. The terminal voltage is a voltage measured across an electrical connection of the two-wire process variable transmitter to the two-wire process control loop. A microprocessor performs loop diagnostics on the two-wire process control loop based upon a loop current and the measured terminal voltage. The microprocessor determines coefficients of a polynomial equation which relates loop current and terminal voltage during normal operation of the two-wire process variable transmitter and performs subsequent diagnostics based upon the coefficients of the polynomial.
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