Abstract: A pressure sensor includes a first wafer having a primary deflectable diaphragm and a secondary deflectable diaphragm. The primary deflectable diaphragm has a first relationship between applied pressure and deflection, and the second deflectable diaphragm has a second relationship between applied pressure and deflection. The first and second relationships differ from one another. A second wafer is attached to the first wafer. At least one tensile strain gauge is coupled to the primary deflectable diaphragm and at least one compressive strain gauge coupled to the secondary deflectable diaphragm. An overpressure feature is mounted relative to one of the first wafer and the second wafer. The overpressure feature is configured to contact the other of the first wafer and second wafer during an overpressure condition that exceeds a maximum measurement pressure of the primary deflectable diaphragm and a maximum measurement pressure of the secondary deflectable diaphragm.

Abstract: A process variable transmitter for sensing a cryogenic temperature in an industrial process includes a cryogenic temperature sensor configured to be thermally coupled to an industrial process. The cryogenic temperature sensor has an electrical resistance which changes in response to changes in a cryogenic temperature and the industrial process is at the cryogenic temperature. Resistance measurement circuitry is electrically coupled to the cryogenic temperature sensor and measures a sensor resistance over a resistance range and responsively provides an output related to temperature based upon the measured resistance. Transmitter output circuitry coupled to the measurement circuitry to transmits information related to the cryogenic temperature to a remote location.

Abstract: A pressure transmitter for sensing a pressure of a process fluid in an industrial process includes a pressure sensor body fluidically coupled to the process fluid configured to receive an applied pressure related to a pressure of the process fluid. The pressure sensor body has a high pressure region configured to deform in response to the applied pressure and a low pressure region configured to deform in response to the applied pressure. A high range resistor bridge circuit is mounted in the high pressure region having a powered node, a common node and an output node and has a resistance which changes in response to pressure applied to the high pressure region. A low range resistor bridge circuit is mounted in the low pressure region and has a powered node, a common node and an output node and having a resistance which changes in response to pressure applied to the low pressure region.

Abstract: A process variable transmitter for sensing a cryogenic temperature in an industrial process includes a cryogenic temperature sensor configured to be thermally coupled to an industrial process. The cryogenic temperature sensor has an electrical resistance which changes in response to changes in a cryogenic temperature and the industrial process is at the cryogenic temperature. Resistance measurement circuitry is electrically coupled to the cryogenic temperature sensor and measures a sensor resistance over a resistance range and responsively provides an output related to temperature based upon the measured resistance. Transmitter output circuitry coupled to the measurement circuitry to transmits information related to the cryogenic temperature to a remote location.

Abstract: A load cell body for transmitting forces and moments in plural directions includes a rigid central hub having a central axis and a rigid annular ring concentric with the central hub about the central axis. At least three radial members extend radially with respect to the central axis along corresponding longitudinal axes from the central hub to the annular ring where each radial member includes a center body with an aperture extending there through along an aperture axis that is parallel to the central axis. A first flexure joins the center body to the central hub, while a second flexure joins the center body to the annular ring.

Abstract: A process fluid multivariable measurement system is provided. The multivariable measurement system includes a thermowell configured to couple to a process fluid conduit and extend through a wall of the process fluid conduit. The multivariable measurement system also includes a temperature sensor assembly disposed within the thermowell, the temperature sensor assembly having at least one temperature sensitive element disposed therein. The multivariable measurement system also includes a pressure sensor assembly coupled to the thermowell, the pressure sensor assembly having at least one pressure sensitive element disposed therein. The multivariable measurement system further includes transmitter circuitry, communicatively coupled to the temperature sensor assembly and the pressure sensor assembly, configured to receive a temperature sensor signal from the at least one temperature sensitive element and responsively generate a temperature measurement output based on the temperature sensor signal.

Abstract: A pressure capsule/header assembly for a process fluid pressure transmitter is provided. An isolator plug has an isolation diaphragm at a first end thereof and a second end spaced from the first end. The isolator plug has a fill fluid passageway fluidically coupling the first end to the second end. A header has a first end configured to carry a pressure sensor and a second end spaced from the first end. The header has at least one electrical interconnect extending from the first end to the second end. A biaxial support ring is disposed about an outer surface of the header. The biaxial support ring and the header define a tapered interference interface therebetween. The header is welded to the isolator plug at a first weld and the biaxial support ring is welded to the isolator plug at a location that is spaced from the second end of the header.

Abstract: A process fluid multivariable measurement system is provided. The multivariable measurement system includes a thermowell configured to couple to a process fluid conduit and extend through a wall of the process fluid conduit. The multivariable measurement system also includes a temperature sensor assembly disposed within the thermowell, the temperature sensor assembly having at least one temperature sensitive element disposed therein. The multivariable measurement system also includes a pressure sensor assembly coupled to the thermowell, the pressure sensor assembly having at least one pressure sensitive element disposed therein. The multivariable measurement system further includes transmitter circuitry, communicatively coupled to the temperature sensor assembly and the pressure sensor assembly, configured to receive a temperature sensor signal from the at least one temperature sensitive element and responsively generate a temperature measurement output based on the temperature sensor signal.

Abstract: A pressure capsule/header assembly for a process fluid pressure transmitter is provided. An isolator plug has an isolation diaphragm at a first end thereof and a second end spaced from the first end. The isolator plug has a fill fluid passageway fluidically coupling the first end to the second end. A header has a first end configured to carry a pressure sensor and a second end spaced from the first end. The header has at least one electrical interconnect extending from the first end to the second end. A biaxial support ring is disposed about an outer surface of the header. The biaxial support ring and the header define a tapered interference interface therebetween. The header is welded to the isolator plug at a first weld and the biaxial support ring is welded to the isolator plug at a location that is spaced from the second end of the header.

Abstract: A sensor includes a diaphragm having a bonding portion and a main boss separated from the bonding portion by at least one channel, the main boss having a first side face, a second side face and a chamfered corner face connecting the first side face to the second side face. A base of the sensor has a first contact area aligned with the main boss and separated from the main boss, wherein the bonding portion of the diaphragm is bonded to the base. At least one sensing element senses movement of the diaphragm.

Abstract: A sensor includes a diaphragm having a bonding portion and a main boss separated from the bonding portion by at least one channel, the main boss having a first side face, a second side face and a chamfered corner face connecting the first side face to the second side face. A base of the sensor has a first contact area aligned with the main boss and separated from the main boss, wherein the bonding portion of the diaphragm is bonded to the base. At least one sensing element senses movement of the diaphragm.