公开(公告)号：WO1990007701A1

公开(公告)日：1990-07-12

申请号：PCT/US1989005610

申请日：1989-12-12

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  FRICK, Roger, L. ,  RUD, Stanley, E., Jr.

IPC: G01L07/08

CPC classification number: G02B26/001 ,  G01L9/0042 ,  G01L9/0052 ,  G01L9/0072 ,  G01L9/0073 ,  G01L9/0079

Abstract: A pressure sensor (10, 49, 140) utilizes the effect of different elastic moduli between layers (20, 21; 36, 38; 53, 54; 123, 124; 146, 147) or sections of different material that are bonded together to form a body (17, 35, 52, 122, 145), so that when the bonded material unit (17, 35, 52, 122, 145) is subjected to a uniform hydrostatic external pressure, the differences in the elastic moduli of each of the materials will cause the materials to deflect in a predictable manner proportional to pressure. The amount of warpage or deflection of the body (17, 35, 52, 122, 145) of material can be measured as a function of pressure. Specifically, two layers of materials (20, 21; 36, 38; 53, 54; 123, 124; 146, 147), such as silicon (20, 38, 54, 123-146) and borosilicate glass (21, 36, 53, 124, 147), which have substantially different elastic moduli can be bonded across an interface surface (40, 55) to form an assembly (17, 35, 52, 122, 145) and when subjected to a substantially uniform pressure on the exterior surfaces the asembly (17, 35, 52, 122, 145) will deflect for indicating applied pressure at relatively high pressure ranges. The bonded material assembly (17, 35, 52, 122, 145) is placed in a fluid to provide a substantially uniform applied hydrostatic pressure on all exposed surfaces of the bonded material assembly (17, 35, 52, 122, 145).

公开(公告)号：WO1989012235A1

公开(公告)日：1989-12-14

申请号：PCT/US1989002508

申请日：1989-06-08

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  SCHULTE, John, P. ,  ORTH, Kelly, M. ,  FRICK, Roger, L. ,  WESTFIELD, Brian, L. ,  PASCHKE, Randy, K.

IPC: G01R11/52

CPC classification number: G01L9/12 ,  G01D5/24 ,  G01R27/2605

Abstract: A charge balanced feedback type transmitter (10) generates charge packets representative of a sensed parameter. Improved performance is achieved by the addition of resistance (R1), (R2) connected between a charge packet generating reactance (C1), (C2), (CL1), (CL2) and an integrator (30) to reduce the effects of noise caused by switching transients and by ground noise which is coupled to the charge packet generating circuitry (12) by stray capacitance. The charge packets are integrated by the integrator (30), and the integrator output is supplied from a selective basis to the input of a comparator (32). The output of the comparator (32) is used to control the application of balance. The input of the comparator (32) is selectively connected to the output of the integrator (30), to a first supply voltage, or to a second supply voltage to ensure a stable output of the comparator (32) at a critical time when charge is being supplied to the integrator (30).

公开(公告)号：WO1989003619A1

公开(公告)日：1989-04-20

申请号：PCT/US1988003459

申请日：1988-10-05

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  LONGSDORF, Randy, J.

IPC: H03M01/22

CPC classification number: G08C19/02

Abstract: A threshold detection circuit (30) for improving the output of a two-wire transmitter (10) is disclosed. The transmitter (10) comprises a sensing means (14) which has a sensor (16) responsive to a parameter (12) to be sensed by the transmitter (10) and an excitation means (18) which provides an excitation output to excite the sensor (16). A threshold detection circuit (30) is coupled to the sensor output and provides a detector output representative of an undesired change in excitation output which can produce a sensor output which is not substantially representative of the sensed parameter (12). An output means (24) is coupled to the sensor output and detector output and provides the transmitter output as a function of the sensor output and detector output. A distinctive transmitter output representative of an undesired change in excitation output thus detected is provided, thereby improving the transmitter output.

公开(公告)号：WO1989002580A1

公开(公告)日：1989-03-23

申请号：PCT/US1988003129

申请日：1988-09-12

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  KLEVEN, Lowell, A. ,  CORPRON, Gary, P.

IPC: G01F01/32

CPC classification number: G01F1/3263

Abstract: A vortex sensor (20) in a vortex flowmeter (10) that has a single sensing diaphragm (35) parallel to the direction of flow that is sensitive to differential pressures caused by vortices shed by a vortex shedding bar (19) associated with the sensing diaphragm (35). A beam (36) is attached to the sensing diaphragm (35) and it transfers the deflecting motion of the sensing diaphragm (35) to a sensor (48) external to the flow passageway (14). The sensor (48) provides an output indicating motions of the beam (36) caused by the beam pivoting when the sensing diaphragm (35) deflects. The beam (36) is pivoted on a relatively rigid, fluid-tight isolator diaphragm (40) with one end of the beam (36) on the outside of the isolator diaphragm (40). The sensing diaphragm (35) rejects variations in the static pressure, that is, increases and decreases of the static pressure on both sides of the diaphragm (35).

公开(公告)号：WO1988002107A1

公开(公告)日：1988-03-24

申请号：PCT/US1987002258

申请日：1987-09-03

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  PIERCE, Dean, L. ,  FRICK, Roger, L. ,  CUCCI, Gerald, R.

IPC: G01L07/08

CPC classification number: G01L19/148 ,  G01L19/0007 ,  G01L19/0038 ,  G01L19/0645 ,  G01L19/14 ,  G01L19/142

Abstract: A pressure transmitter (10) is coupled directly to an industry standard flange adapter union (40) having a standard bolt hole spacing. Small diameter isolator diaphragms (30, 31) are positioned on the transmitter case (11) at locations so that the industry standard flange adapter union (40) which couple fluid pressure sources (42, 42A) to act on the isolator diaphragms (30, 31) without an intermediate large flange or manifold as is presently required and using the fasteners (44) for the adapter union (40) to complete the coupling. The smaller isolators (30, 31) fit within the bolt hole spacing of the industry standard adapter union (40).

公开(公告)号：WO1986002487A1

公开(公告)日：1986-04-24

申请号：PCT/US1985001933

申请日：1985-10-08

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  FRICK, Roger, L.

IPC: H01G07/00

CPC classification number: G01L9/0086 ,  G01L9/125

Abstract: Sensor circuitry (60) for sensing changes in capacitance of separate sensor portions (19, 20) wherein in each of the sensor portions (19, 20) a separate plate (20, 22 or 25, 33) will deflect in response to changes in parameter, for example changes in pressure, to thereby provide an output that relates to differential pressure. The specific example is in connection with sensor portions (19, 20) which are fluid filled and in fluid communication with each other so that a deflection of a plate (20, 25) on one of the sensor portions (20) cause an opposite deflection of a plate (22, 23) on the other sensor portion (19). The circuitry (60) provides a stable output regardless of some variation in sensor characteristics. Temperature induced variations in the dielectric constant and density of the fluid filling the sensor portions may all be compensated for in the circuitry. Preferably CMOS logic devices (72) that provide a signal which exhibits a direct relationship to capacitive loading are used. The signal is sensed to modify the voltage applied to the CMOS device (72) to achieve a desired relationship. The voltage or current output from the capacitors (19, 20) indicates the capacitive values of the sensor (19, 20).

公开(公告)号：WO1986002447A1

公开(公告)日：1986-04-24

申请号：PCT/US1985001932

申请日：1985-10-08

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  FRICK, Roger, L.

IPC: G01L09/12

CPC classification number: G01L9/0075 ,  G01L9/0086 ,  G01L13/028

Abstract: A pressure sensing cell construction (10) comprises a pair of plates (42, 43) which are joined together around the periphery, to form a first chamber (45). A second chamber (52), preferably identically constructed to the first chamber (45) with a second pair of plates (46, 48) is connected to the first chamber (45) through a conduit (47). The chambers (45, 52) and the conduit (47) are filled with non compressible liquid, so that when pressure acts on the outer surfaces of the plates (42, 43, 46, 48), at least one plate deflects and the liquid in one chamber (45) will tend to be squeezed out into the other chamber (47), and by measuring the spacing between the plates (42, 43) the pressure sensed can be determined. The plates (42, 43) preferably are made of a brittle material so that pressures can be determined with high accuracy. The plates (42, 43, or 46, 48) forming the chamber (45 or 47) subjected to the higher pressure will contact each other as a positive stop to limit the amount of deflection of the plates forming the other chamber (45 or 47) as the fluid causes such other chamber to expand under high overpressures on the plates of the chamber subjected to higher pressure. Thus, the device will withstand this high overpressure without damage, even though it is constructed of brittle materials.

公开(公告)号：WO1985003826A1

公开(公告)日：1985-08-29

申请号：PCT/US1985000222

申请日：1985-02-13

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  OLSON, Gene, H. ,  QUY, Dennis, A.

IPC: H04J03/00

CPC classification number: H04L12/417 ,  G06F13/372 ,  H04J3/0638 ,  H04L2012/4026

Abstract: A data communication system (10) allocates use of a common data communication medium (14) shared by a plurality of stations (12A-12D). During each transmission cycle, the communication medium (14) carries data packets of varying priority which each station (12A-12D) receives. The stations (12A-12D) are allocated use of the communication medium (14) during one or more priority intervals as a function of the priority of the packet which the station is ready to transmit. Each station (12A-12D) is synchronized to a transmission cycle period which is divided into subperiods. Certain types of packets are relegated to transmission and reception within predetermined subperiods.

Abstract translation: 数据通信系统（10）分配由多个站（12A-12D）共享的公共数据通信介质（14）的使用。 在每个传输周期期间，通信介质（14）承载每个站（12A-12D）接收的具有不同优先级的数据分组。 作为站准备发送的分组的优先级的函数，在一个或多个优先级间隔期间，将站（12A-12D）分配给通信介质（14）。 每个站（12A-12D）被同步到被分成次周期的传输周期。 某些类型的分组被降级到在预定子周期内的发送和接收。

公开(公告)号：WO1985003825A1

公开(公告)日：1985-08-29

申请号：PCT/US1985000221

申请日：1985-02-13

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  OLSON, Gene, H. ,  QUY, Dennis, A.

IPC: H04J01/16

CPC classification number: H04L12/417 ,  H04L1/22

Abstract: A redundant common communication (10) system for a distributed process control or data processing system has multiple stations (12A-12D) which are coupled to at least two redundant communication channels (such as communication busses (BUS A and BUS B)). Each station (12A-12D) includes a transmitter (18) for transmitting data packets and a receiver (20) for receiving data packets. Each data packet includes a channel selection field which identifies a selected channel to be used by all stations during a succeeding transmission of a data packet. Each station (12A-12D) makes an assessment of quality of each channel based upon the occurrence of errors when that channel is in use. The station (12A-12D) computes a margin value based upon assessed quality factors. When the station (12A-12D) computes a margin value based upon assessed quality factors. When the station (12A-12D) gets an opportunity to transmit, the channel selection field of the transmitted packet identifies a channel which is selected based upon the margin value and the frequency of previous use of each of the channels. As a result, frequent switching among the channels occurs, with the percentage of use of each channel being dependent upon the assessed quality of that channel by the various stations(12A-12D).

公开(公告)号：WO1985001133A1

公开(公告)日：1985-03-14

申请号：PCT/US1984001374

申请日：1984-08-28

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  BROWN, Gregory, C.

IPC: G05D16/00

CPC classification number: F15C3/14 ,  F15B5/003 ,  Y10T137/2322 ,  Y10T137/2365 ,  Y10T137/7761

Abstract: An electric signal to pneumatic signal transducer (10) comprises a nozzle (12) that accepts an input pneumatic supply and expels a gas stream (20). A receiver (16) that is spaced from the nozzle (12) is positioned to recover at least a portion of the gas stream (20). The recovered portion constitutes a pneumatic output signal (Pout). The position of a deflector (14) relative to the gas stream (20) is controlled by an electric input signal (Iin) to aerodynamically deflect the gas stream (20) expelled from the nozzle (12). The aerodynamic deflection affects the magnitude of the portion of the gas stream (20) recovered by the receiver (16) in a manner having a known relationship to the electric input signal, thereby generating a pneumatic output signal responsive to the electric input signal.