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    CONVERSION CIRCUIT FOR PROCESS CONTROL SYSTEM
    2.
    发明专利
    CONVERSION CIRCUIT FOR PROCESS CONTROL SYSTEM 未知

    公开(公告)号：CA2222548A1

    公开(公告)日：1996-12-19

    申请号：CA2222548

    申请日：1996-05-31

    Applicant: ROSEMOUNT INC

    Inventor： PIECHOWSKI TODD A ,  LOUWAGIE BENNETT L ,  ANDERSON STEPHEN D ,  WESTFIELD BRIAN L

    IPC: G05B11/36 ,  G05B19/042 ,  G05B19/418 ,  H04L25/02 ,  G08C19/16

    Abstract: Conversion circuitry (40) for use in a process control system (10) is adapted for coupling to a primary process control loop (26). Digital receiver circuitry (46, 52) in the conversion circuitry (40) receives a digital signal transmitted over the primary process control loop (26) from a field transmitter (22) and responsively provides a digital output. A microprocessor (50) receives the digital output and responsively provides a secondary loop control output. Secondary loop control circuitry (62) for coupling to a secondary process control loop (58) receives the secondary loop control output from the microprocessor (50) and responsively controls current flowing through the secondary process control loop (58). The current flowing through the secondary process control loop (58) is related to the digital signal transmitted by the field transmitter (22).

    Pressure transmitter with fill fluid loss detection
    3.
    发明专利
    Pressure transmitter with fill fluid loss detection 未知

    公开(公告)号：AU4110596A

    公开(公告)日：1996-06-19

    申请号：AU4110596

    申请日：1995-11-15

    Applicant: ROSEMOUNT INC

    Inventor： RUD STANLEY E JR ,  PETRICH WILLIAM E ,  LOUWAGIE BENNETT L ,  KROUTH TERRANCE F

    IPC: G01L9/00 ,  G01L19/00 ,  G01L19/06 ,  G01M3/16 ,  G01L27/00 ,  G01M3/26

    Abstract: A pressure transmitter has a pressure sensor coupled to an isolator diaphragm by a fill fluid such as oil. According to the invention, means are provided for measuring the position of the isolator diaphragm and comparing the measured position with an expected position to give an indication of fill fluid leakage. Non-contact arrangements such as capacitive and ultrasonic techniques are disclosed for measuring isolator diaphragm position, as well as contacting arrangements such as switches. The fill fluid loss arrangement can be incorporated into a two-wire transmitter, which transmitter can be made to send a warning signal to a control unit when fill fluid loss is detected.

    PRESSURE TRANSMITTER WITH IMPROVED ISOLATOR SYSTEM
    4.
    发明申请
    PRESSURE TRANSMITTER WITH IMPROVED ISOLATOR SYSTEM 审中-公开
    具有改进隔离系统的压力变送器

    公开(公告)号：WO0184101A3

    公开(公告)日：2002-05-30

    申请号：PCT/US0113993

    申请日：2001-05-01

    Applicant: ROSEMOUNT INC

    Inventor： NORD CHRISTINA A ,  HORKY DAVID A ,  GUTTSEN KENNETH G ,  JOHNSON THOMAS E ,  SHERIN MATTHEW G ,  SZAFRANSKI KEVIN P ,  BALLOT WILLIAM J ,  PATRICK RENAE M ,  HARASYN DONALD E ,  EIDENSCHINK RYAN R ,  SCHANSBERG TODD W ,  ROMO MARK G ,  BEHM STEVEN M ,  LOUWAGIE BENNETT L ,  HEDTKE ROBERT C ,  RUD STANLEY E JR ,  BREKKEN JEFFREY C

    IPC: G01L19/06 ,  G01L19/00

    CPC classification number: G01L19/0645 ,  G01L19/0618 ,  G01L19/0663

    Abstract: A pressure transmitter (10) with a fluid isolator (11) that includes a sensor tube (38) and a fill tube (50) that have "D" shaped ends (40, 54) that connect together in a port (18) internal to the transmitter (10). The shaped ends (40, 54) can be brazed into the port (18) for sealing. Fitting both the sensor tube (38) and the fill tube (50) in the same port provides a low cost isolator with reduced isolator liquid volume. The fluid isolator (11) has an isolator diaphragm (96) with a central diaphragm region (100) overlying a central backing plate (94) that includes an annular groove (111). The annular groove (111) avoids slow response of the isolator (11) after an overpressure condition.

    Abstract translation: 一种具有流体隔离器（11）的压力变送器（10），其包括传感器管（38）和填充管（50），所述传感器管（38）和填充管（50）具有在内部端口（18）中连接在一起的“D”形端 到发射机（10）。 成形端部（40,45）可以钎焊到端口（18）中用于密封。 将传感器管（38）和填充管（50）同时配合在同一个端口，提供了一种具有降低的隔离液体积的低成本隔离器。 流体隔离器（11）具有隔离隔膜（96），其中央隔膜区域（100）覆盖在包括环形凹槽（111）的中央背板（94）上。 环形槽（111）避免了超压状态后隔离器（11）的响应缓慢。

    Pressure isolator assembly for sanitary processing
    10.
    发明专利
    Pressure isolator assembly for sanitary processing 未知

    公开(公告)号：SG43766A1

    公开(公告)日：1997-11-14

    申请号：SG1996000704

    申请日：1994-04-12

    Applicant: ROSEMOUNT INC

    Inventor： LOUWAGIE BENNETT L ,  EVERETT CRAIG A ,  LEMIRE STEPHEN M

    IPC: G01L19/06 ,  G01L7/08 ,  G01L19/00

    Abstract: An isolator diaphragm is formed and connected to a support member so it will withstand periodic high pressure cleaning. Such periodic cleaning includes use of heated, concentrated cleaning solutions flowing under high pressure from a nozzle which moves rapidly over segments of an exposed surface of the isolator diaphragm. The present invention prevents isolator diaphragm failure precipitated by the substantially incompressible isolator fluid driven toward the perimeter of the diaphragm during cleaning operations. Such cleaning operations generate a separating force between the isolator diaphragm and diaphragm support. The isolator diaphragm has a peripheral wall portion bonded to a planar support surface and is formed to have an offset center region. The peripheral wall and center region are joined by a conical, inclined wall bounding the center portion. The support member has a correspondingly shaped recess with an inclined annular wall that supports the conical wall of the diaphragm. The primary diaphragm flexure point of the center portion of the diaphragm is moved away from the perimeter of the diaphragm, to adjacent the junction of the inclined wall and the center region. The bonding area is not subjected to a high separating force due to the movement in the incompressible fill fluid to a localized region of the diaphragm adjacent a seal or junction line.

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