Abstract:
A pressure transmitter assembly (100) for measuring a process pressure of an industrial process includes a pressure sensor (500) configured to sense the process pressure. A process coupling couples (106) the pressure sensor (500) to the industrial process. In one example configuration, a phase change material (312) carried in the process coupling (106) is configured to reduce heat transfer from the industrial process to the process variable sensor by changing phase in response to heat from the industrial process. In another example configuration, a thermocouple electric cooling element (122) is coupled to the process coupling (106) and configured to conduct heat away from the coupling (106) in response to an applied electric current.
Abstract:
A corrosion rate measurement system (130) includes a first membrane (160) of a first material configured to be exposed to a corrosive material and deflect in response to corrosion. A second membrane (162) is configured to be exposed to a corrosive material and deflect in response to corrosion. A pressure sensor (134) is operably coupled to at least one of the first and second membranes (160, 162) and configured to measure deflection of at least one of the first and second membranes (160, 162) as a function of a pressure and an amount of corrosion at least one of the first and second membranes (160, 162).
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:
A polymeric remote seal system is provided for coupling a single-use container (110) to a pressure measurement instrument (104). The polymeric remote seal system includes a process-side coupling (116), an instrument-side coupling (118) and a fluidic coupling (106) therebetween. The process-side coupling (116) is configured to couple to the single-use container (110) and is formed of a radiation sterilizable polymer. The process-side coupling (116) has a process-side deflectable diaphragm (256; 234) that is configured to deflect in response to pressure within the single-use container (110). The instrument-side coupling (118) is configured to couple to the pressure measurement instrument (104) and is formed of a radiation sterilizable polymer. The instrument-side coupling (118) is configured to fluidically convey fluid pressure to an isolation diaphragm of the pressure measurement instrument. Tubing (106) fluidically couples the process-side coupling (116) to the instrument-side coupling (118).
Abstract:
A first sensor (2, 4, 120, 230, 232, 300) senses an organic gas, liquid or vapor and includes a first support (30, 32, 102, 210, 212, 306) having a first support surface with a layer of material (26, 28, 112, 216, 218, 302) fastened to it. In the presence of liquid, gas or vapor, the material (26, 28, 112, 216, 218, 302) swells and expands so as to vary at least one of its dimensions. Such expansion develops a stress at an interface between the first support surface and the material (26, 28, 112, 216, 218, 302), and strain sensitive devices (14, 16, 100, 204, 206, 210, 212, 306, 308) detect the stress and produce an output which varies as a function of the stress at the interface.
Abstract:
A micromachined miniature valve (10) used for gas chromatography has very low valve and interconnection dimensions to reduce the fluid volume inherent in other gas switching valves to thereby provide accurate measurements involving small gas flows. In order to reduce actuating diaphragm size, without encountering excessive stress concentrations in the diaphragm, the diaphragm (18) can be polyimide film actuated in connection with a silicon valve body (15, 22) having valve seats (40D-45D) with ports that are opened or closed by deflection of the diaphragm (18). Silicon wafers can be micromachined using batch fabrication techniques to provide the necessary valve seats (40D-45D) and passageways (30-35) for operating. The valve assembly (10) is produced as a layered sandwich made up of individual wafers, including an actuator layer (25), a stop layer (22), a valve seat layer (15), and a layer (11) which has flow channels receiving gas from the valve seat layer (15) and making the necessary interconnections to provided outlets. The diaphragm film (18) is positioned between the valve seat layer (15) and the stop layer (22), and is deflected or displaced to control passage of gases through the valve openings. The diaphragm layer (18) is sealed to the silicon valve body (15, 22) by a process which involves fusing, such as glass frit or solder sealing.
Abstract:
A process variable transmitter (36) for measuring a pressure of a process fluid includes a process coupling having a first port (90) configured to couple to a first process pressure and a second port (90) configured to couple to a second process pressure. A differential pressure sensor (56) is coupled to the first and second ports and provides an output related to a differential pressure between the first pressure and the second pressure. First and second pressure sensors (97, 98) couple to the respective first and second ports and provide outputs related to the first and second pressures. Transmitter circuitry (72) is configured to provide a transmitter output based upon the output from the differential pressure sensor and/or the first and/or second pressure sensors.
Abstract:
A process variable transmitter (12) for use in an industrial process control or monitoring system includes a transmitter housing and a process variable sensor (72) having a sensor output related to a process variable. An accelerometer (80) is coupled to the transmitter and provides an accelerometer output related to acceleration. Diagnostic circuitry (82) provides a diagnostic output as a function of the sensor output and the accelerometer output.
Abstract:
A pressure sensor assembly (100) includes an elongate pressure sensor (102) mounted to a sensor mounting block (104). A protective element covers (120) the elongate pressure sensor (102) to prevent the pressure sensor from contacting process fluid.
Abstract:
A magnet (16) mounted on a moving stem (12) or rotary member of a valve generates magnetic flux over part of a stationary member (14) of the valve which has a uniquely patterned set of magnetoresistive sense resistors (RSIG0-RSIG4) and three reference resistors (130, 134, 148) disposed thereon. The distance between two adjacent patterns can be equally spaced, or can be compressed for valves with non-linear characteristics in order to achieve increased resolution over a specific portion of the valve travel. Other embodiments can use a light source, beta radiation or neutron radiation as the source of flux, the pattern for each embodiment's sensor having some material responsive and some unresponsive to the flux. The sensor (18) can provide feedback representative of position in a valve positioner, or functions as the position sensor in a position transmitter.