公开(公告)号：WO1994005988A1

公开(公告)日：1994-03-17

申请号：PCT/US1993008097

申请日：1993-08-27

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  WILLCOX, Charles, R. ,  LEVY, Kevin, R. ,  PETERSEN, Eric, P. ,  PEITERSEN, Larry, A.

IPC: G01L09/12

CPC classification number: G01L9/0073 ,  G01L9/0042

Abstract: A pedestal mount capacitive pressure sensor (10) is supported in a housing (11) and used to sense fluid pressures to provide air pressure data relating to the performance of air vehicles. The capacitive sensor uses a thick base plate (40) on which a diaphragm (48) is mounted. A capacitive electrode (52) is mounted to the diaphragm and pressure deflects the diaphragm to provide an output. The pressure sensor (10) is mounted in an outer housing (11) using a stress isolating pedestal (20).

Abstract translation: 基座安装电容式压力传感器（10）被支撑在壳体（11）中并且用于感测流体压力以提供与空中车辆的性能相关的气压数据。 电容式传感器使用安装有隔膜（48）的厚基板（40）。 电容电极（52）安装在隔膜上，压力使隔膜偏转以提供输出。 使用应力隔离基座（20）将压力传感器（10）安装在外壳体（11）中。

公开(公告)号：WO1994005986A1

公开(公告)日：1994-03-17

申请号：PCT/US1993008142

申请日：1993-08-30

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  LUTZ, Mark, A. ,  KRUEGER, William, B.

IPC: G01L07/08

CPC classification number: G01L19/0618 ,  G01L9/0042

Abstract: A low range pressure sensor (10) includes a base plate of brittle material (12), and a diaphragm plate assembly (14) mounted on the base plate (12) and sealed around a periphery (16) to the base plate (12). Pressures are introduced to cause a center diaphragm section (18) to deflect toward the base plate (12), and the deflection of the diaphragm (18) is sensed through strain gauges (32) to provide an indication of the pressure. The diaphragm (18) is provided with a plurality of individual support posts (36) on a side facing the base plate (12), so that when the diaphragm (18) is deflected toward the base plate (12) under high overpressures the support posts (36) will support the diaphragm (18) against movement to avoid failure or breakage of the diaphragm (18). The number of support posts (36) can be varied as desired. In a preferred form of the invention, the base plate is provided with a very thin layer (40) of silicon dioxide, which is a good electrical insulator and which also serves to help accommodate slight movement of the support posts (36) as they touch the surface of the base plate (12) to reduce stress buildup in the diaphragm (18) as the overpressure increases.

Abstract translation: 低范围压力传感器（10）包括脆性材料基板（12）和安装在基板（12）上并围绕基板（12）的周边（16）密封的隔膜板组件（14） 。 引入压力使得中心隔膜部分（18）朝向基板（12）偏转，并且通过应变仪（32）感测隔膜（18）的偏转以提供压力指示。 隔膜（18）在面向基板（12）的一侧上设置有多个单独的支撑柱（36），使得当隔膜（18）在高超压下朝向基板（12）偏转时，支撑 柱（36）将支撑隔膜（18）防止运动，以避免隔膜（18）的故障或破裂。 支撑柱（36）的数量可以根据需要而变化。 在本发明的优选形式中，底板设置有非常薄的二氧化硅层（40），其是良好的电绝缘体，并且还用于帮助支撑柱（36）在触摸时的轻微移动 基板（12）的表面，以在过压增加时减小隔膜（18）中的应力累积。

公开(公告)号：WO1993008463A1

公开(公告)日：1993-04-29

申请号：PCT/US1992008514

申请日：1992-10-07

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  BENTON, Barry, W. ,  MAJERUS, Lawrence, R. ,  RUTT, Donald, R. ,  SITTLER, Fred, C. ,  TOY, Adrian, C.

IPC: G01N27/26

CPC classification number: G01N27/333

Abstract: A pH sensor (10) has an electrode assembly (20) with an electrode (34) with a core (38) of an electrochemically inert insulating or semi-conductive material, and is coated with an electrically conductive, electrochemically sensitive coating (40). The preferred core (38) is insulating and made of alumina, with a thin coating (40) of iridium oxide deposited over at least a portion of the outer surface of the core (38). The coating (40) is carried to a region (70) remote from the sensing surface (46) and is used for making electrically conductive connections (52, 54) that lead to remote circuitry (32). The core (38) is made in a form that can be supported and held in an insulating, electrochemically inert, deformable material (36) that is sealed around the outer surface of the coating (40) on the core (38) to prevent leakage of chemicals being sensed. An outer housing (14) also permits sealing quite easily into access ports on which the sensor housing (14) is mounted.

公开(公告)号：WO1993006390A1

公开(公告)日：1993-04-01

申请号：PCT/US1992007855

申请日：1992-09-17

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  KROUTH, Terrance, F. ,  ZWEBER, Michael, J.

IPC: F16J15/10

CPC classification number: F16J15/3236 ,  F16J15/121 ,  Y10S277/946

Abstract: A spring loaded seal (30) is placed between three continuous groove walls (22, 24, 26) between mating parts (12, 16) adjacent to a pressure transmitter isolator (14). The seal (30) includes a resin ring (32) with two ring walls (34, 36) conformable to two (26, 28) of the groove walls. A third ring wall (38) has a continuous slot (42) extending into the ring (32). A coil spring (50) is placed in the slot (42) such that, upon mating of the parts (12, 16), the third wall (26) presses the coil spring (50) toward the slot (42). This compresses the coil spring (50) to sealingly force the first and second outer ring walls (34, 36) against the first and second groove walls (24, 28) respectively with a controlled force. The compression of the coil spring (50) controls the sealing force to limit undesired distortion of the groove walls (24, 26, 28).

公开(公告)号：WO1992005408A1

公开(公告)日：1992-04-02

申请号：PCT/US1991006868

申请日：1991-09-20

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  LONGSDORF, Randy, J. ,  HEDTKE, Robert, C. ,  NELSON, Richard, L.

IPC: G01F23/14

CPC classification number: G01F23/14

Abstract: A differential pressure transmitter (42) is used to measure the level of settled water (14) residing below a process fluid (12) and at the bottom of a tank (10). The pressure transmitter (42) measures a pressure difference between a pressure tap (48) of the tank located below an upper level of the higher specific gravity settled water and a second pressure tap (24) of a reference column (22, 86, 88) containing only lower specific gravity process fluid and opening to the tank (10) at a level (26) above the settled water. The differential pressure is a function of the specific gravity or density of the water (14) and a pressure head of the waterc (14). Utilizing the differential pressure and specific gravity data the height of the water (14) in the tank (10) can be determined. The reference column (22, 86, 88) is capable of being purged to remove any water or other impurities. A portion of the reference column (22, 86, 88) extends at least as high vertically as the lighter fluid (12) in the tank (10). The reference column can be a separate column (86, 88) that can be closed off from the tank (10) to permit the differential transmitter (42) to sense differential pressure changes due to level changes of fluid in the tank (10).

Abstract translation: 差压变送器（42）用于测量位于处理流体（12）下方和罐（10）底部的沉降水（14）的水平。 压力变送器（42）测量位于较高比重沉淀水的较高水平的罐的压力分接头（48）和参考柱（22,86,88）的第二压力分接头（24）之间的压力差 ），其仅含有较低的比重过程流体并且在沉降的水之上的水平（26）处开启到罐（10）。 差压是水（14）的比重或密度和水（14）的压头的函数。 利用差压和比重数据，能够确定罐（10）中的水（14）的高度。 参考柱（22,86,88）能够被吹扫以除去任何水或其它杂质。 参考柱（22,86,88）的一部分至少与罐（10）中的较轻液体（12）垂直地延伸。 参考柱可以是可以从罐（10）关闭的单独的列（86,88），以允许差动变送器（42）感测由于罐（10）中的流体的水平变化引起的压差变化。

公开(公告)号：WO1992002066A1

公开(公告)日：1992-02-06

申请号：PCT/US1991005109

申请日：1991-07-19

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  ROVNER, Bruce, D.

IPC: H02H09/02

CPC classification number: H02H11/002 ,  H02H9/008 ,  H02H9/025

Abstract: A process control instrument (10) receiving a DC current from a two wire loop (11, 43) having overcurrent protection (16, 52) and reverse current protection (20, 54) circuits interposed between a two wire loop (11, 43) and a process control device (24) for reducing the incidence of damage or degradation to the process control device (24) from excessive and reverse polarity currents from the loop. The overcurrent protection circuit (16, 52) comprises device current flowing through a first current sensing circuit (34, 60) which generates a first output which controls impedance of a current diverting circuit (38, 62). The impedance of the current diverting circuit controls the flow of a shunt current shunted back to the two wire loop (11, 43). Shunt current flowing through a second current sensing circuit (13, 50) generates a second output which controls impedance of a first variable impedance circuit (32, 70). The first variable impedance circuit (32, 70) conducts the device current and limits device current flowing through the process control device (24) to a predetermined range. A potential sensing circuit (18, 94) in the reverse current protection circuit (20, 54) senses a potential induced across the process control device (24) and generates a third output which is indicative of polarity of device current. The third output controls impedance of a second variable impedance circuit (30, 56) which also conducts the device current. The second variable impedance circuit (30, 56) reduces the flow of reverse polarity current through the process control device (24) while having little effect on normal operation of the process control instrument (10).

公开(公告)号：WO1991004475A1

公开(公告)日：1991-04-04

申请号：PCT/US1990004280

申请日：1990-07-31

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  WALISH, James, E. ,  MATTISON, Lee, Ann ,  PETERSON, Thomas, P.

IPC: G01L07/08

CPC classification number: G01L19/0038 ,  G01L19/0084 ,  G01L19/0645 ,  G01L19/0663 ,  G01L19/143

Abstract: A transmitter (10) that provides an output indicating pressure difference between a line pressure and atmosphere outside the transmitter (10) is made intrinsically safe by coupling the sensor cavity (44) as well as other cavities (12, 13) where ignition can occur to atmosphere only through flame quenching paths. The opening (22) in the transmitter housing (10) in which the sensor (45) is mounted has a plug (41) including the sensor cavity (44) that holds the sensor (45), and a fitting (26) which is couplable to the pressure line. An isolator (35) is used for transmitting the process pressure to the sensor (45) through an isolator diaphragm (35A) acting on an incompressible filling the sensor cavity (44) and transmitting pressure through a passageway (35B) that is shaped to provide a flame quenching path. The passageway (35B) flame isolates the sensor (45) from the process fluid line. The opposite side of the sensor (45) is connected to atmosphere only through paths (50, 51, 52) which are flame quenching because of the passageway shape. The plug (35) is an assembly that can be made easily inserted and removed, and provides intrinsic safety even if there is failure of some of the components such as the isolating diaphragm (35A) or welds holding portions of the plug (35) together.

公开(公告)号：WO1991004463A1

公开(公告)日：1991-04-04

申请号：PCT/US1990005188

申请日：1990-09-13

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  WEHRS, David, L.

IPC: G01F01/60

CPC classification number: G01F1/60

Abstract: A magnetic flowmeter generates an alternating potential (V19) representing flow. A controlled current (I12) excites the flowmeter with first and second amplitudes of current. A correction output (I26) represents the first and second amplitudes. A circuit (36) connected to the correction output (I26) and the alternating potential (V19) oscillates at a frequency representing the alternating potential corrected for variation of the first and second amplitudes. Frequencies of the oscillations at first and second amplitudes are measured (38). An output is calculated (39) as a function of a subtraction of the first and second measured frequencies such that the effect of offset is reduced.

公开(公告)号：WO1990015314A1

公开(公告)日：1990-12-13

申请号：PCT/US1990002197

申请日：1990-04-23

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  GOETZINGER, Charles, E.

IPC: G01K07/12

CPC classification number: G01K7/13

Abstract: A transmitter (10) generates an output signal, which represents temperature, based on potential across thermocouple leads (L1, L2) from a main thermocouple (12). A housing has first and second terminals (20, 22) extending through a wall (18) which separates first and second cavities (14, 16) in the housing. The terminals (20, 22) are connected to the thermocouple leads (L1, L2) in the first cavity to form terminal cold junctions (J2, J3). A converter (24) has converter leads (L3, L4) which are connected to the terminals (20, 22) in the second cavity. The converter (24) senses a combined signal which represents main thermocouple potential and terminal cold junction potential. The converter (24) also provides the output signal. A conductor (C1) has a first end coupled to the first terminal (22) and a second end coupled to the converter forming a correction thermocouple (J4, J5). The correction thermocouple (J4, J5) provides a first correction signal representing a difference between a terminal temperature and a converter temperature. A sensor (26) on the converter (24) provides a converter temperature signal which represents the converter temperature. The converter (24) provides the output signal as a function of the converter temperature signal, the first correction signal and the combined signal.

公开(公告)号：WO1990015312A1

公开(公告)日：1990-12-13

申请号：PCT/US1990002477

申请日：1990-05-04

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  SCHWARTZ, Bradley, N. ,  KUGLER, Stanley ,  SELG, Donald, W.

IPC: G01K01/08

CPC classification number: G01K1/10 ,  G01K1/14 ,  G01K13/02

Abstract: A temperature transmitter (40) connects to a first conduit (62) containing leads (60) from a temperature sensor (52) and also to second conduit (44) which conveys the output leads (98) of the transmitter (40) to a remote location (42). A wall (50) in the transmitter (40) divides the transmitter (40) into first (72) and second (70) compartments sealed from one another. The first compartment (72) receives the leads (60) from the temperature sensor (52) and contains the electric circuit (76) for converting the signal of the temperature sensor (52) to an output signal representative of temperature. A feedthrough (92) passing through the wall (50) connects the output signal to the output leads (98) in the second compartment (70). The arrangement thus provides an integral seal between the conduits by blocking the flow of potentially hazardous fluid from the first conduit (62) through the second conduit (48) to a remote location (42) such as a control room.