Abstract:
PROBLEM TO BE SOLVED: To provide a process seal for process control reducing force that is necessary for sealing. SOLUTION: The process seal for the process control transmitter is provided. The seal includes a contact area providing a metal to metal seal with respect to a coupling flange. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To reduce a stress generated on an isolation diaphragm by a mounting force of process coupling. SOLUTION: This process transmitter for measuring a process pressure includes a pressure sensor in a sensor housing. The isolation diaphragm for isolating a filled fluid from a process fluid is arranged at a space from a seal of the process fluid. The space reduces deformation of the isolation diaphragm caused by the mounting force. COPYRIGHT: (C)2004,JPO
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 pressure transmitter (14) for clean processing environments is disclosed. The pressure transmitter (14) includes a process connector (48), a weld ring (42), a pressure sensor module (46), a frame (26), and a housing (22). The process connector (48) is coupleable to a source of process fluid (18) and directs process fluid to the pressure sensor module (46). The process connector (48) is sealed to the pressure sensor module (46) to couple process fluid to the pressure sensor (60, 80). A weld ring (42) is disposed about the pressure sensor module (46) and provides a secondary process fluid seal. The pressure sensor module is electrically coupled to measurement circuitry (58) to provide digital data indicative of process fluid pressure. The frame (26) is coupled to the weld ring (42) and the housing (22) is coupleable to the frame (26) and weld ring (42) such that the housing (26) rests upon the weld ring (42) when secured in place. The pressure sensor module (46) includes an isolator diaphragm (76) that is operably coupled to a pressure sensor (60, 80). The pressure sensor (60, 80) includes deflectable sensor diaphragm having elements thereon that provide an electrical characteristic that varies with diaphragm deflection (60, 80) are separated from one another by a filler material (82). The filler material (82) can be polyurethane.
Abstract:
A pressure transmitter (10) for measuring a pressure of a process fluid in an industrial process, includes a pressure sensor (16) having an output related to an applied pressure. Measurement circuitry (18,20) coupled to the pressure sensor (16) is configured to provide a transmitter output related to sensed pressure. A pressure coupling face (60) having an opening (48,52) therein is arranged to transfer the applied pressure to the pressure sensor (16). A pressure coupling flange (13) having a flange face (62) abutting the pressure coupling face (60) is configured to convey the process fluid to the opening (48,50) of the pressure coupling face (60). Features are provided to control distribution of a loading force across the pressure coupling face and the flange face.
Abstract:
An isolation assembly for connection to a process transmitter (50) and for mitigating high temperature effects of a process fluid includes a process coupling face (70) having an isolation diaphragm (72,74) configured to contact process fluid. A transmitter coupling (124) has a pressure coupling configured to couple to a pressure port of the process transmitter (50). A temperature isolation fluid conduit (120,122) extends between the process coupling face (70) and the transmitter coupling (124) and carries an isolation fluid which couples a pressure applied to the isolation diaphragm (74) to the pressure coupling to minimize high temperature effects of the process fluid on the process transmitter (50).
Abstract:
A capacitive pressure sensor (30) for an industrial process transmitter (12) comprises a housing (62A & 62B), a sensing diaphragm (58), an electrode (60A or 60B) and a fill fluid. The housing (62A & 62B) includes an interior cavity (78) and a channel extending from an exterior of the housing (62A & 62B) to the cavity (78). The sensing diaphragm (58) is disposed within the interior cavity (78) opposite the electrode (60A or 60B). The fill fluid occupies the interior cavity (78) such that a pressure from the channel is conveyed to the sensing diaphragm (58) to adjust a capacitance between the electrode (60A or 60B) and the sensing diaphragm (58). The fill fluid has a dielectric constant higher than about 3.5. In various embodiments, the pressure sensor (30) has a diameter less than approximately 3.175 centimeters (~1.25 inches).
Abstract:
A pressure transmitter for measuring a pressure of a process fluid includes a pressure sensor, a hydraulic relay system and a pressure sensor fill fluid. The pressure sensor senses the pressure of the process fluid, and the hydraulic relay system provides a communication channel between the process fluid and the pressure sensor. The pressure sensor fill fluid in the hydraulic relay system comprises a first hydraulic fluid and a first volume of nano-particles. The first hydraulic fluid transmits a change in the pressure of the process fluid to the sensor. The first volume of nano-particles is suspended within the first hydraulic fluid and alters properties of the pressure sensor fill fluid.
Abstract:
A field device (14) for use in an industrial process control or monitoring system (10) connects to a two-wire process control loop (16). The loop (16) carries data and provides power to the field device (14). RF circuitry (22) in the field device (14) is provided for radio frequency communication. A power supply (18) powers the RF circuitry (22) using power received from the two-wire process control loop (16).
Abstract:
A pressure transmitter (10) for measuring a pressure of a process fluid in an industrial process, includes a pressure sensor (16) having an output related to an applied pressure. Measurement circuitry (18,20) coupled to the pressure sensor (16) is configured to provide a transmitter output related to sensed pressure. A pressure coupling face (60) having an opening (48,52) therein is arranged to transfer the applied pressure to the pressure sensor (16). A pressure coupling flange (13) having a flange face (62) abutting the pressure coupling face (60) is configured to convey the process fluid to the opening (48,50) of the pressure coupling face (60). Features are provided to control distribution of a loading force across the pressure coupling face and the flange face.