公开(公告)号：WO1985002908A1

公开(公告)日：1985-07-04

申请号：PCT/US1984002143

申请日：1984-12-24

Applicant: THE FOXBORO COMPANY

Inventor： THE FOXBORO COMPANY ,  CHENEY, Charles, M.

IPC: G01N25/28

CPC classification number: G01N25/22 ,  G01N33/225

Abstract: An apparatus for determining the heating value of a fuel gas stream of variable composition utilizes a housing of high thermal conductivity defining a small volume combustion chamber, and filled with a bed of highly thermally conductive particles surrounding an electrical-resistance heater. The heater maintains the internal temperature of the chamber above the combustion point of the fuel gas, to totally combust the enclosed sample. The bed of particles transmits the heating effects of the combustion to the housing. A temperature sensor attached to the housing communicates with a feedback controller which acts to maintain the housing temperature constant, by appropriately adjusting the electrical energy supplied to the heater. Means are provided to correlate changes in the electrical energy to the heating content of the fuel sample.

公开(公告)号：WO1984001445A1

公开(公告)日：1984-04-12

申请号：PCT/US1983001225

申请日：1983-08-08

Applicant: THE FOXBORO COMPANY

Inventor： THE FOXBORO COMPANY ,  BOLZ, Carl, W. ,  OLSEN, Everett, O. ,  PETERSON, Neal, D. ,  GRAVES, Norman, S.

IPC: G05D03/00

CPC classification number: G05D3/12

Abstract: A valve positioning mechanism, configurable as either a positioner or a converter, acts in response to a control signal supplied over a two-wire transmission line by a remotely-located controller, and provides a feedback signal over the same two-wire line to the controller. Depending on the configuration used, this feedback signal verifies either that the valve has assumed the position directed by the controller or that the actuating pressure to the valve is as directed by the controller. The control signal triggers an electropneumatic switch which initiates the flow of air to operate a pneumatic mechanism driving the valve stem. A variable inductor, its inductance value being dependent upon the valve position/actuating pressure, forms part of an oscillator whose ouput frequency varies with the inductance value. The oscillator in turn provides a measurement signal to the controller over the two-wire transmission line, the frequency of the signal being proportional to the valve position/actuating pressure. The controller terminates adjustment of the valve when the measurement signal equals the controller setpoint. Upon loss of power, the valve can be maintained at a pre-existing position, or, in an optional arrangement, be returned to a fail-safe condition, with or without a predetermined delay.

Abstract translation: 可定位器或转换器配置的阀定位机构响应于由位于遥控器的双线传输线提供的控制信号而起作用，并通过相同的双线线路将反馈信号提供给 控制器。 根据所使用的配置，该反馈信号验证阀已经假定由控制器指示的位置，或者阀门的致动压力如控制器所指示。 控制信号触发电动气动开关，其启动空气流动以操作驱动阀杆的气动机构。 可变电感器，其电感值取决于阀门位置/致动压力，构成振荡器的一部分，其输出频率随电感值而变化。 振荡器又通过双线传输线向控制器提供测量信号，信号的频率与阀位置/致动压力成比例。 当测量信号等于控制器设定值时，控制器终止阀的调整。 在功率损失的情况下，阀可以保持在预先存在的位置，或者以任选的布置返回到故障安全状态，有或没有预定的延迟。

公开(公告)号：WO1993004412A1

公开(公告)日：1993-03-04

申请号：PCT/US1992007023

申请日：1992-08-26

Applicant: THE FOXBORO COMPANY

Inventor： THE FOXBORO COMPANY ,  BRISTOL, Edgar, H. ,  HANSEN, Peter, D.

IPC: G05B13/04

CPC classification number: G05B13/042 ,  G05B11/42

Abstract: Multivariable adaptive feedforward control may be accomplished by detecting the beginning and ending of a process control disturbance response, characterizing the measured inputs and process output during the disturbance by moments, which comprise time-weighted integrals performed on the process result output and inputs when the disturbance is a measured disturbance, and relating the characterized inputs and process result output in known general transfer function model equations to generate transfer function parameters which are used to calculate the coefficients of feedforward additive or multiplicative compensators.

Abstract translation: 多变量自适应前馈控制可以通过检测过程控制干扰响应的开始和结束，在扰动期间表征测量的输入和过程输出，其中包括对过程结果输出执行的时间加权积分和扰动时的输入 是测量的干扰，并将特征输入和过程结果输出与已知的一般传递函数模型方程相关联，以产生用于计算前馈加法或乘法补偿器系数的传递函数参数。

公开(公告)号：WO1993003332A2

公开(公告)日：1993-02-18

申请号：PCT/US1992006375

申请日：1992-07-31

Applicant: THE FOXBORO COMPANY ,  BROWN, Christopher, R.

Inventor： THE FOXBORO COMPANY

IPC: G01F01/58

CPC classification number: G01F1/60 ,  G01F1/58 ,  G01F1/584 ,  G01F1/586 ,  G01F1/588 ,  Y10T29/49007 ,  Y10T29/4902

Abstract: A monolithic flowtube for use with an electromagnetic flowmeter includes an inner portion formed of an improved purity dielectric material having a reduced number of mobile ions, a pair of electrodes adjacent the exterior surface of the inner portion and capacitively coupled thereto, and an outer layer of ceramic material adjacent the exterior surface of the inner conduit and electrodes. A method of manufacturing the flowtube includes the steps of forming a dielectric material into a substantially tubular conduit, depositing a conductive material, preferably a refractory metal, onto the exterior of the tubular conduit, forming an outer layer of ceramic material over the tubular conduit, and firing all components simultaneously in a reducing atmosphere to form a monolithic flowtube body. A magnetic flowmeter includes, in addition to a flowtube and a pair of electrodes, a magnetic field source for creating a time-varying magnetic field passing through the flowtube, and special circuitry, including secondary coil windings, for electrically altering the average direction of the magnetic field relative to the flowtube access so as to minimize the zero offset present in the output flow signal from the electrodes.

Abstract translation: 本发明涉及一种适合与电磁流量计一起使用的单片流管，其包括具有减少数目的移动离子的较高纯度介电材料的内部部分，一对 与内部部分的外表面相邻并与其电容耦合的电极以及与内部导管和电极的表面相邻的陶瓷材料外层。 本发明还描述了一种方法，该方法可以制造这种流管，并且该方法包括将基本上为管状的导管形式的介电材料成形，以将导电材料例如优选难熔金属沉积在面上 在管状导管外部，在管状导管上形成陶瓷材料的外层，然后在导电气氛中同时烧制所有这些组分，以形成单片流管主体。 由此获得的磁通量计除了流量管和一对电极之外还包括用于产生流过流量管的时变磁场的磁场源，电路 装置，其具有次级线圈绕组并且用于相对于流管的入口电气地改变磁场的平均方向，以便最小化所发射的输出流量信号中的零点偏移 来自电极。

公开(公告)号：WO1991005225A1

公开(公告)日：1991-04-18

申请号：PCT/GB1990001442

申请日：1990-09-19

Applicant: THE FOXBORO COMPANY ,  HEMP, John

Inventor： THE FOXBORO COMPANY

IPC: G01F01/58

CPC classification number: G01F1/58 ,  G01F1/584 ,  G01F25/003

Abstract: An electromagnetic flowmeter with conventional orthogonal electrode and magnetic axes (x, y) intersecting the flowtube axis (z) has its electrodes constituted by two pairs (1, 2, and 3, 4) of electrodes mounted in insulating tubing (5) on each side of the flow passage through the tubing. Four conductors extend respectively from the four electrodes to enable the potential difference between the two electrodes on each side due to an axial component on each side of eddy current electric field in the liquid to be determined for self-calibration purposes in compensating automatically for any extraneous change in the magnetic field and the average potential of each pair of electrodes can also be determined to derive the velocity of flow of the liquid. One of the two pairs of electrodes can be replaced by a single electrode. The electrodes can be point electrodes or electrodes of substantial area and methods are described for mathematically adapting various types of electrodes to the required purpose and to eddy currents in parts of the assembly. The invention can also be applied to an eddy current probe for giving readings of sensitivity at a conventional flowmeter.

公开(公告)号：WO1990001164A1

公开(公告)日：1990-02-08

申请号：PCT/US1989003149

申请日：1989-07-20

Applicant: THE FOXBORO COMPANY

Inventor： THE FOXBORO COMPANY ,  ANNINO, Raymond ,  BARTLETT, Michael, L. ,  KARAS, Edwin, L. ,  LUECK, Dale, E. ,  MIDDLETON, John, L. ,  VILLALOBOS, Richard

IPC: G01N30/02

CPC classification number: G01N30/466 ,  G01N30/78 ,  G01N2030/0095

Abstract: A dual-column, dual-detector gas detector (10) and analyzer employs both a photo-ionization detector (12) and a flame-ionization detector (14). In a survey mode, samples of ambient air are driven through both detectors, and the outputs of both detectors are used to determine the presence of one or more gases. In analysis mode, fixed-volume samples of ambient air are driven through two elution columns (34, 40) having different properties. The output of each elution column is fed to one of the detectors. The arrival times of gas peaks at the two detectors are employed to develop two lists of candidate gases. The lists are cross-checked for the presence of each candidate on both lists. Candidates identified from their presence on both lists are identified. A further check attempts to identify candidates which are identifiable from their presence on one of the lists, and not on the other. Components identified in this way are added to the final list. Unidentified components are discarded, although their presence is noted and reported as unknown. Portability is retained by eliminating isothermal ovens and by reducing the quantity of hydrogen required. A simplified way of characterizing temperature corrections of elution columns is disclosed.

公开(公告)号：WO1989008244A1

公开(公告)日：1989-09-08

申请号：PCT/US1989000823

申请日：1989-03-03

Applicant: THE FOXBORO COMPANY

Inventor： THE FOXBORO COMPANY ,  KOEN, Edward, F. ,  TASKER, Richard

IPC: G01L09/00

CPC classification number: G01L19/003 ,  G01L19/0084 ,  G01L19/0627 ,  G01L19/0645 ,  G01L19/147

Abstract: A solid state measured sensor (10) is described in which the pressure sensor element (14) is protected from the measurand by a combination of a pressure transfer medium (31) and a thin covering membrane (32). A method is described for forming the diaphragm in situ. The membrane material is selected from a group of materials which includes fluorosilicone, so as to substantially avoid entrapment of air or formation of voids in the pressure transfer medium (31) such as would degrade the performance of the sensor (10). The pressure transfer medium (31) is a gel-like material such as dimethyl silicone and equivalents. Alternatively, the gel may be fluorosilicone and the diaphragm may be dimethyl silicone. The membrane material is chosen to be substantially impermeable to the ambients or process media being measured and also flexible, is to be poured and cured in place on the assembly during fabrication .

Abstract translation: 描述了固态测量传感器（10），其中通过压力传递介质（31）和薄覆盖膜（32）的组合来保护压力传感器元件（14）免受被测量。 描述了用于在原位形成隔膜的方法。 膜材料选自包含氟硅氧烷的一组材料，以便基本上避免空气的夹带或在压力传递介质（31）中形成空隙，例如会降低传感器（10）的性能。 压力传递介质（31）是诸如二甲基硅氧烷和等同物的凝胶状材料。 或者，凝胶可以是氟硅氧烷，并且隔膜可以是二甲基硅氧烷。 膜材料被选择为对被测量的环境或加工介质基本上不可渗透，并且也是柔性的，在制造期间将其倾倒并固化在组件上的适当位置。

公开(公告)号：WO1987001214A1

公开(公告)日：1987-02-26

申请号：PCT/US1986001481

申请日：1986-07-16

Applicant: THE FOXBORO COMPANY

Inventor： THE FOXBORO COMPANY ,  FLANAGAN, Allan, L. ,  RICHARDSON, David, A.

IPC: G05B15/02

CPC classification number: G05B15/02 ,  Y10S706/906 ,  Y10S706/908

Abstract: Reading values, setting values and setting configuration options within a complex programmable controller is simplified, by chaining all user interaction points into a single path, cross linking portions of the main path into subpaths and providing keys that step the user according to his selection along the main path, along the subpaths, and between the subpaths. A two part display indicating the general and specific positions clarify the locations and the options available.

公开(公告)号：WO1986002448A1

公开(公告)日：1986-04-24

申请号：PCT/US1985001564

申请日：1985-08-19

Applicant: THE FOXBORO COMPANY

Inventor： THE FOXBORO COMPANY ,  SGOURAKES, George, E. ,  ANGELOSANTO, John, P. ,  MALLOY, Barry, T.

IPC: G01L27/00

CPC classification number: G01L27/005

Abstract: A differential-pressure transmitter having a range diaphragm (42) and a slack diaphragm (44) to receive process pressures and to apply such pressures to an interior sealed chamber containing a fill-liquid. A vertically-oriented tube (62) containing liquid communicating with the instrument fill-liquid contains a ball (64) movable by gravity down through the liquid to create a reference-pressure pulse directed to the range diaphragm to provide for checking instrument performance. A relatively large weight (82) is suspended from the ball to increase the effect of gravity on the ball, so as to increase the magnitude of the reference-pressure pulse. A flexible seal-and-pivot connection (88) is provided at the top of the tube to permit substantial inclinations of the instrument relative to vertical without interference with the wall of the tube. The additional weight is in one embodiment divided into vertically-separable segments (94A, B, C) to provide for successive bottoming of the segments as the weight descends, to provide a stepped pressure pulse. Errors due to change in static pressure are avoided or reduced by special compensating arrangements.

公开(公告)号：WO1985005178A1

公开(公告)日：1985-11-21

申请号：PCT/US1985000808

申请日：1985-05-03

Applicant: THE FOXBORO COMPANY

Inventor： THE FOXBORO COMPANY ,  OLSEN, Everett, O. ,  BROWN, Christopher, R. ,  CHITTY, Gordon, W.

IPC: G01L01/10

CPC classification number: G01K11/26 ,  G01D5/268 ,  G01K1/024 ,  G01L1/103 ,  G01L9/0011 ,  G01L9/0014

Abstract: An optically driven, electromagnetically oscillating resonant sensor subjected to a stress force wherein the optical driving energy and the optically communicated signal generated in response to the stress force are both communicated a substantial distance along a single optical fiber (14). A portion of the supply energy (19) drives the oscillatory mechanism (20) and a portion is reflected to a frequency detector (18) by the shuttering action of the resonant element. The device may be configured so as to be electrically driven and optically sensed, optically driven and electrically sensed, or both optically driven and optically sensed for maximum retrofit versatility in past, present, and future process control systems.

Abstract translation: 经受应力的光驱动的电磁振荡谐振传感器，其中响应于应力的力产生的光学驱动能量和光通信信号都沿着单根光纤（14）传送相当长的距离。 供应能量（19）的一部分通过谐振元件的快门动作驱动振荡机构（20）并且一部分被反射到频率检测器（18）。 该器件可以被配置为电过驱动和光学感测，光学驱动和电感测，或者被光学驱动和光学感测，以便在过去，现在和未来的过程控制系统中实现最大的改进的多功能性。