中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

23 records (took 0.021 seconds)

    METHOD OF DETECTING A MATERIAL INTERFACE USING A MICROWAVE LEVEL TRANSMITTER
    1.
    发明申请
    METHOD OF DETECTING A MATERIAL INTERFACE USING A MICROWAVE LEVEL TRANSMITTER 审中-公开
    使用微波级发射器检测材料接口的方法

    公开(公告)号：WO0175475A3

    公开(公告)日：2002-03-28

    申请号：PCT/US0109069

    申请日：2001-03-21

    Applicant: ROSEMOUNT INC

    Inventor： LOVEGREN ERIC R ,  PEDERSON DAVID L

    IPC: G01F23/284 ,  G01N22/00 ,  G01S7/292 ,  G05B15/00

    CPC classification number: G01S7/292 ,  G01F23/284

    Abstract: Disclosed is a method for detecting the presence of a twin peak pulse (60) in a waveform (40), generated by a microwave level transmitter (10), that is used to detect levels of first and second material interfaces (18, 20) relating to materials contained in a tank (12). The waveform (40) develops a twin peak pulse (60) when the first and second material interfaces (18, 20) are in close proximity to one another. The twin peak pulse (60) contains overlapping first and second received wave pulses (44, 46) reflected from the first and second material interfaces (18, 20), respectively. The method determines that the waveform (40) contains a twin peak pulse (60) when both a first peak point (62) relating to the first received wave pulse (44) and a valley (64) are detected. Also disclosed is a microwave level transmitter (10) having an interface detection module (32) that is configured to use the method of the present invention to detect the existence of a twin peak pulse (60) in a waveform (40).

    Abstract translation: 公开了一种用于检测由微波电平变送器（10）产生的用于检测第一和第二材料界面（18,20）的电平的波形（40）中双峰脉冲（60）的存在的方法， 涉及容纳在罐（12）中的材料。 当第一和第二材料界面（18,20）彼此靠近时，波形（40）形成双峰脉冲（60）。 双峰脉冲（60）分别包含从第一和第二材料界面（18,20）反射的重叠的第一和第二接收波脉冲（44,46）。 当检测到与第一接收波脉冲（44）相关的第一峰值点（62）和谷（64）两者时，该方法确定波形（40）包含双峰脉冲（60）。 还公开了一种具有接口检测模块（32）的微波级发射器（10），其被配置为使用本发明的方法来检测波形（40）中双峰脉冲（60）的存在。

    2.
    发明专利
    未知

    公开(公告)号：AT109295T

    公开(公告)日：1994-08-15

    申请号：AT87906717

    申请日：1987-09-24

    Applicant: ROSEMOUNT INC

    Inventor： KIELB JOHN A ,  NELSON RICHARD L ,  PEDERSON DAVID L

    IPC: G08C19/02 ,  G08C19/04 ,  H04M11/04

    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.

    APPARATUS FOR COMMUNICATING BETWEEN SYSTEMS HAVING DIFFERENT COMMUNICATIONS STANDARDS
    3.
    发明专利
    APPARATUS FOR COMMUNICATING BETWEEN SYSTEMS HAVING DIFFERENT COMMUNICATIONS STANDARDS 未知

    公开(公告)号：CA2047459A1

    公开(公告)日：1992-01-21

    申请号：CA2047459

    申请日：1991-07-19

    Applicant: ROSEMOUNT INC

    Inventor： LONGSDORF RANDY J ,  PEDERSON DAVID L

    IPC: G05B19/418 ,  H04L5/14

    Abstract: The communicator made according to the present invention receives queries from a process controller and directs them to their intended destination after formatting them appropriately. The received query contains a process variable (PV) address section. A storage section stores the PV address, which is representative of a storage location for a process variable in a field device (FD). The FD is in a network of FDs where each FD has an FD type and a unique FD address. In an associating section, each of a plurality of FD addresses and the FD type corresponding to such FD address are associated with one PV address corresponding thereto and an output is provided which is representative of a corresponding address pair. An extracting section receives the stored PV address from the storing means and accesses the associating means, searching through the address pairs and extracting an output containing the FD address and the FD type corresponding to a PV address which matches the stored PV address. Finally, a generating section receives the extracted FD address and FD type and generates a FD request as a function of the PD type and containing the extracted FD address. The FD request is conveyed over a line common to the FDs, to the FD containing the stored PV address location. The storage section includes an IEEE serial interface for coupling to the process controller. In a preferred embodiment, the IEEE serial interface can be RS232, RS-422 or RS-485. In another embodiment, the storage section includes two IEEE serial interfaces, either couplable to the process controller. The storage section 7074A also has a bidirectional echoing section coupled between the IEEE serial interfaces for echoing a query received on one interface to the other interface. 7074A

    4.
    发明专利
    未知

    公开(公告)号：DK297588A

    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

    IPC: G08C19/02 ,  G08C19/00

    Abstract: An existing analogue two-wire transmitter 11 has a sensor module 35, and analogue circuits 23 which provide an output signal representative of a sensed process variable, such as, for example, pressure, to a two-wire current loop 14. At least a part of the analogue circuit 23 is removed and replaced with apparatus including a digital converter 52 that digitally calculates the transmitter output signal using the same current range in the current loop 14 and calculating corrections for obtaining linearity of the output signal.

    DIGITAL CONVERTER APPARATUS FOR IMPROVING THE OUTPUT OF A TWO-WIRE TRANSMITTER
    6.
    发明专利
    DIGITAL CONVERTER APPARATUS FOR IMPROVING THE OUTPUT OF A TWO-WIRE TRANSMITTER 未知

    公开(公告)号：CA1334994C

    公开(公告)日：1995-03-28

    申请号：CA548261

    申请日：1987-09-30

    Applicant: ROSEMOUNT INC

    Inventor： KIELB JOHN A ,  NELSON RICHARD L ,  PEDERSON DAVID L

    IPC: G08C19/02 ,  G08C19/04

    Abstract: An existing analog two-wire transmitter has a sensor module, an analog excitation circuit, and an analog detector circuit which provides an output representative of a sensed process variable, such a pressure, to a two-wire current loop. The analog detection circuit is removed and replaced with apparatus including a digital converter that digitally calculates the transmitter's output. The output is improved by calculating correction for linearity. The analog excitation circuit may also be replaced with a replacement excitation circuit. The replacement excitation circuit and the digital converter can be energized in series to control energization current. A charge pump can be coupled to the loop to balance the current in the series circuit. The digital converter can also provide electrical span and zero adjustments.

    8.
    发明专利
    未知

    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

    IPC: G08C19/02 ,  G08C19/36

    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.

    9.
    发明专利
    未知

    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

    IPC: G08C19/02 ,  G08C19/00

    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.

Patent Agency Ranking