Abstract:
A process fluid pressure measurement system includes a process fluid pressure transmitter coupled to a coplanar manifold (120). The coplanar manifold (120) includes a first bore (112) coupleable to a source of process fluid, and a vent passageway (114) connected to the first bore and terminating in a vent hole (108). The coplanar manifold (120) includes at least one port (122) configured to receive a valve stem (52). Directly engaging the valve stem (52) with the coplanar manifold selectively vents the coplanar manifold. Aspects of the present invention also include a coplanar manifold for coupling fluid to a process fluid pressure transmitter, and a method of venting such a coplanar manifold.
Abstract:
A capacitive pressure transmitter (300) is provided. In one aspect, the transmitter (300) includes a capacitive pressure sensor (56) coupled directly to the measured media without any intervening fluid isolation. A filter is preferably used to keep particulates from reaching the measuring diaphragm. In another aspect, a capacitive pressure transmitter (300) is provided with at least one self-contained isolator (210) interposed between a process connection (200) and the capacitive pressure sensor (56). In both aspects, the capacitive pressure transmitter (300) is relatively small and preferably constructed from materials that facilitate low-cost manufacture. Silicon oxide is used as a plate coating.
Abstract:
A two-wire transmitter (2) senses differential pressure, absolute pressure, and process temperature of a process fluid. The information can be used to provide an output representative of mass flow through a pipe (4). The transmitter (2) has an electronics module housing (14) attached to a sensor module housing (16).
Abstract:
An in-line process fluid pressure transmitter (100) is provided. The transmitter (100) includes a process fluid connector (102) configured to couple to a source of process fluid. A plug (190) is coupled to the process fluid connector (102) and has a passageway (181) configured to convey fluid to a distal end (183) of the plug (190). A pressure sensor subassembly (180) is coupled to the plug (190) at a weld (187). The pressure sensor subassembly (180) has a pressure sensor (185) operably coupled to the distal end (183) of the passageway (181) such that the pressure sensor (185) reacts to process fluid pressure. The plug (190) includes a sidewall (186) encircling the weld (187). Transmitter electronics are coupled to the pressure sensor (185) and configured to measure an electrical characteristic of the pressure sensor (185) and provide a process fluid pressure value based on the measured electrical characteristic.
Abstract:
A process device (202) includes a fluid disruption generation element (210) to generate a fluid disruption within process fluid flowing through a pipe associated with an industrial process and a process variable sensor coupled to the disruption generation element (210) to measure a process parameter. The process device (202) further includes a power generation element (212) adapted to generate an electrical output signal in response to the fluid disruption and a power storage component (226) coupled to the power generation element (212). The power storage component (226) is adapted to accumulate a charge based on the electrical output signal.
Abstract:
A process fluid pressure transmitter (10) includes a pressure sensor (16), transmitter electronics (18), and an isolation system (14). The pressure sensor (16) has an electrical characteristic that changes with pressure. The transmitter electronics are coupled to the pressure sensor (16) to sense the electrical characteristic and calculate a pressure output. The isolation system (14) includes a base member (30), and isolation diaphragm (32), and a fill-fluid (38). The isolation diaphragm (32) is mounted to the base member (30) and interposed between the pressure sensor (16) and a process fluid. The fill-fluid (38) is disposed between the isolation diaphragm (32) and the pressure sensor (16). The base member (30) and the isolation diaphragm (32) are constructed from different materials such that the coefficient of thermal expansion of the isolation diaphragm (32) is larger than the coefficient of thermal expansion of the base member (30).
Abstract:
A pressure monitoring system (200) provides a pressure sensor (214) and a body that has a first coefficient of thermal expansion and includes at least one opening (226) for accessing a process fluid. At least one isolation diaphragm (230) is coupled to the body and positioned in the at least one opening (226). The at least one isolation diaphragm (230) has a first surface in communication with the process fluid. At least one passageway (222) is located in the body and configured to contain a fill fluid in communication with a second surface of the first isolation diaphragm. The at least one passageway (222) is positioned between the first isolation diaphragm (230) and the pressure sensor (214). At least one expansion chamber (242) is coupled to the first passageway and includes an insert (246) having a second coefficient of thermal expansion. The first coefficient of thermal expansion of the body is greater than the second coefficient of thermal expansion of the insert (246).
Abstract:
A pressure transmitter assembly (400) for measuring a pressure of a process fluid includes an isolation diaphragm assembly (402) configured to couple to a process fluid. A pressure sensor (408) is coupled to the isolation diaphragm assembly (402) and is configured to sense a pressure. An isolation diaphragm coupling flange (420) is provided to carry the isolation diaphragm assembly (402) and includes a cutaway portion (430, 432, 434) to provide thermal isolation.
Abstract:
An instrument (100) used to control fluid flow. The instrument has a flow restrictor (110) between an inlet (106) and an outlet (108). First and second multisensor (120, 124) have sensing surfaces (122, 126) in the inlet and outlet that sense pressures and temperatures of the fluid flow. A circuit (130) generates a mass flow output (155) based on a difference between the pressure in the inlet and the pressure in the outlet. The mass flow output including a temperature correction as a function of at least one of the sensed temperatures in the inlet and outlet.
Abstract:
A transmitter provides an output that is indicative of pressure and has two modular transmitter bodies (20, 30), one (20) including a sensor (22), and the other (30) having an isolator diaphragm (32, 33) with a substantially non-compressible fluid that transfers movement of the isolator diaphragm (32, 33) to the sensor (22). The bodies each have mating passageways (36, 37, 40, 41) to transfer non-compressible fluid from one body (30) to the other (20) and are assembled together using a ring of extrusile material (48, 49) disposed around the mating portions of the passageways to seal the passageways together when the transmitter bodies (20, 30) are assembled. The isolation fluid is filled in the passageways before the first and second transmitter bodies (20, 30) are assembled. The assembly can be accomplished without complex procedures and still insure that accurate transmitter operation will be obtained.