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    TESTING EQUIPMENT BUILT-IN A TRANSMITTER
    23.
    发明专利
    TESTING EQUIPMENT BUILT-IN A TRANSMITTER 未知

    公开(公告)号：CZ71796A3

    公开(公告)日：1996-11-13

    申请号：CZ71796

    申请日：1994-08-15

    Applicant: ROSEMOUNT INC

    Inventor： VOEGELE KEVIN D ,  WESTFIELD BRIAN L ,  LANCTOT JANE B

    IPC: G01R27/14 ,  G01R31/28

    Abstract: An improved error detection for microprocessor-based transmitters in two-wire process control loops operating in the process control industry. In particular, techniques are shown which are useful in solving malfunctions or failures of microprocessor-based transmitters. When the transmitter is energized, the impedance of the process loop cabling is resolved and stored, displayed or transmitted as desired. The loop impedance is used to calculate potential of a power supply used to power the control loop. This information is used in testing the two-wire loop.

    24.
    发明专利
    未知

    公开(公告)号：BR9206536A

    公开(公告)日：1995-10-24

    申请号：BR9206536

    申请日：1992-08-20

    Applicant: ROSEMOUNT INC

    Inventor： ANDERSON STEPHEN D ,  FRICK ROGER L ,  MONZO GLEN E ,  WESTFIELD BRIAN L

    IPC: G08C19/02 ,  G08C19/00

    Abstract: A three wire transmitter bidirectionally communicates AC signals to and from a first external device and sends DC signals to a second external device. The transmitter includes a communication circuit which is energized from power and common terminals and includes memory storage for transmitter status and a process variable (PV). The communication circuit receives a sensor output indicative of the PV and provides the DC signal and the AC signal to a signal terminal which connects to both external devices, and also receives AC signals from the first external device. The communications circuit has a characteristic AC impedance between the signal and common terminals over an AC frequency range for receiving and transmitting AC signals to and from the first external device so that the receiving signals are not shorted out and so the transmitted signals can be received. The communications circuit has a characteristic DC impedance between the signal and common terminals over a range of frequencies which include DC and typically extend to approximately 20 Hz. The characteristic impedance is substantially lower than the impedance of the second external device which receives DC signals so that the accuracy of the DC signal is not compromised.

    RF ADAPTER FOR FIELD DEVICE WITH LOW VOLTAGE INTRINSIC SAFETY CLAMPING
    25.
    发明专利
    RF ADAPTER FOR FIELD DEVICE WITH LOW VOLTAGE INTRINSIC SAFETY CLAMPING 未知

    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.

    RF ADAPTER FOR FIELD DEVICE WITH LOW VOLTAGE INTRINSIC SAFETY CLAMPING
    26.
    发明专利
    RF ADAPTER FOR FIELD DEVICE WITH LOW VOLTAGE INTRINSIC SAFETY CLAMPING 未知

    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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