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公开(公告)号：HK135094A
公开(公告)日：1994-12-09
申请号：HK135094
申请日：1994-12-01
Applicant: ROSEMOUNT INC
Inventor： KIELB JOHN A , NELSON RICHARD L , PEDERSON DAVID L
Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.
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公开(公告)号：MX160488A
公开(公告)日：1990-03-12
申请号：MX864087
申请日：1987-10-01
Applicant: ROSEMOUNT INC
Inventor： KIELB JOHN A , NELSON RICHARD L , PEDERSON DAVID L
Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.
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公开(公告)号：DK297588D0
公开(公告)日：1988-06-01
申请号：DK297588
申请日：1988-06-01
Applicant: ROSEMOUNT INC
Inventor： KIELB JOHN A , NELSON RICHARD L , PEDERSON DAVID L
Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.
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公开(公告)号：CA2726707C
公开(公告)日：2016-01-19
申请号：CA2726707
申请日：2009-06-17
Applicant: ROSEMOUNT INC
Inventor： KIELB JOHN A , WESTFIELD BRIAN L , ORTH KELLY M
IPC: H04B1/04 , G05B9/03 , G05B19/418 , H01G11/00 , H04B7/24
Abstract: An adapter (300) for coupling to a process control transmitter (308) of the type used to monitor a process variable in an industrial process includes a first connection configured to couple to a first side of a two wire process control loop (302), a second connection configured to couple to a second side of the two wire process control loop (302) and in series with a first connection to a process control transmitter (308), and a third connection configured to couple to a second connection of the process control transmitter (308). Wireless communication circuitry is coupled to at least the third connection and is configured to provide wireless communication for the process control transmitter (308). Intrinsic safety circuitry (460) coupled to at least one of the first, second and third connections is configured to limit transfer of electrical energy to a value which is less than an intrinsic safety value.
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公开(公告)号：CA2726707A1
公开(公告)日：2009-12-23
申请号：CA2726707
申请日：2009-06-17
Applicant: ROSEMOUNT INC
Inventor： KIELB JOHN A , WESTFIELD BRIAN L , ORTH KELLY M
IPC: H04B1/04 , G05B19/418 , H04L12/56
Abstract: An adapter (300) for coupling to a process control transmitter (308) of the type used to monitor a process variable in an industrial process includes a first connection configured to couple to a first side of a two wire process control loop (302), a second connection configured to couple to a second side of the two wire process control loop (302) and in series with a first connection to a process control transmitter (308), and a third connection configured to couple to a second connection of the process control transmitter (308). Wireless communication circuitry is coupled to at least the third connection and is configured to provide wireless communication for the process control transmitter (308). Intrinsic safety circuitry (460) coupled to at least one of the first, second and third connections is configured to limit transfer of electrical energy to a value which is less than an intrinsic safety value.
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Patent Agency Ranking
公开(公告)号：AU6057300A
公开(公告)日：2001-01-22
申请号：AU6057300
申请日：2000-06-28
Applicant: ROSEMOUNT INC
Inventor： KIELB JOHN A
IPC: G01F23/284
Abstract: A radar gauge adapted to sense fluid level in a tank and including a radar gauge circuit in which radar transmission and level sampling are controlled by a transmit frequency and a sample frequency respectively. A first frequency separation between first and second frequencies is controlled by a control input. The first and second frequencies can be divided to generate the transmit and sample frequencies, separated by a second frequency separation. At least one frequency difference is evaluated and the evaluation used to generate the control input, stabilizing the first frequency difference, and to correct the gauge output.
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公开(公告)号：IN170265B
公开(公告)日：1992-03-07
申请号：IN6MA1987
申请日：1987-09-22
Applicant: ROSEMOUNT INC
Inventor： KIELB JOHN A , NELSON RICHARD L , PEDERSON DAVID L
Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.
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公开(公告)号：ES2005363A6
公开(公告)日：1989-03-01
申请号：ES8702804
申请日：1987-10-01
Applicant: ROSEMOUNT INC
Inventor： KIELB JOHN A , NELSON RICHARD L , PEDERSON DAVID L
Abstract: UN TRANSMISOR BIFILAR ANALOGICO EXISTENTE TIENE UN MODULO DETECTOR, UN CIRCUITO DE EXCITACION ANALOGICO, Y UN CIRCUITO DETECTOR ANALOGICO QUE PROPORCIONA UNA SALIDA REPRESENTATIVA DE UNA VARIABLE DE TRATAMIENTO DETECTADA, TAL COMO UNA PRESION, A UN CIRCUITO CERRADO BIFILAR DE CORRIENTE. EL CIRCUITO DE DETECCION ANALOGICO ES RETIRADO Y SUSTITUIDO POR UN APARATO QUE INCLUYE UN CONVERTIDOR DIGITAL QUE CALCULA DIGITALMENTE LA SALIDA DEL TRANSMISOR. LA SALIDA SE MEJORA CALCULANDO LA CORRECCION DE LINEALIDAD. EL CIRCUITO DE EXCITACION ANALOGICO PUEDE SER TAMBIEN REEMPLAZADO POR UN CIRCUITO DE EXCITACION SUSTITUTIVO. EL CIRCUITO DE EXCITACION SUSTITUTIVO Y EL CONVERTIDOR DIGITAL PUEDEN ESTAR ACTIVADOS EN SERIE PARA CONTROLAR LA CORRIENTE DE ACTIVACION. UNA BOMBA DE CARGA PUEDE SER ACOPLADA AL CIRCUITO CERRADO PARA EQUILIBRAR LA INTENSIDAD EN EL CIRCUITO EN SERIE. EL CONVERTIDOR DIGITAL PUEDE PROPORCIONAR TAMBIEN AJUSTES ELECTRICOS DEL INTERVALO Y DEL CERO.
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公开(公告)号：NO882395D0
公开(公告)日：1988-05-31
申请号：NO882395
申请日：1988-05-31
Applicant: ROSEMOUNT INC
Inventor： KIELB JOHN A , NELSON RICHARD L , PEDERSON DAVID L
Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.
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公开(公告)号：AU8039387A
公开(公告)日：1988-04-21
申请号：AU8039387
申请日：1987-09-24
Applicant: ROSEMOUNT INC
Inventor： KIELB JOHN A , NELSON RICHARD L , PEDERSON DAVID L
Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.
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