Rosemount Inc.

Brian J Bischoff

David Andrew Broden

David Eugene Wiklund

Bennett L Louwagie

Michael J Zweber

Gary P Corpron

Gregory S Munson

Gary A Lenz

Alan P Shilepsky

Thomas M Moser

Michael B Jost

Mark H Olson

Lina Long

A pressure transmitter includes an isolator mounting assembly for isolating process fluid from an interior cavity of the pressure transmitter. The isolator mounting assembly includes an isolator plug for receiving the process fluid line pressure and coupling the line pressure to a sensor cavity formed by a header joined to a distal end of the plug. A ring member is attached to the header and the distal end of the plug to reinforce the joint formed between the isolator plug and the head. In another embodiment, the isolator mounting assembly includes a base and a support having first and second opposed ends. The first end is rigidly bonded to the pressure sensor while an epoxy joint joins the second end of the support to the base.

Pressure transmitter with high pressure isolator mounting assembly

A two-wire transmitter 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. The transmitter has an electronics module housing attached to a sensor module housing. The sensor module housing contains all the sensors for the pressures and includes a boss input for receiving a signal representative of a temperature or pressure signal. The three process variables are appropriately digitized, and received by an electronics circuit board in the electronics housing including a microprocessor for calculating the mass flow. The microprocessor in the electronics housing also calculates a compressibility factor and a discharge coefficients according to a polynomials of specific forms. The boss is integral to the sensor module housing and is adapted to fit either shielded twisted pair cabling or conduit.

Differential pressure measurement arrangement utilizing dual transmitters

A transmitter in a process control system for measuring flow rate measures total pressure (P.sub.TOT) and differential pressure (h) of process fluid flowing through a process pipe. The static pressure (P.sub.STAT) is determined based upon the total pressure (P.sub.TOT). The calculated static pressure is used to determine the fluid density (.rho.) and the gas expansion factor (Y.sub.1) of the process fluid flowing in the pipe. This information is used to calculate flow rate (Q) of the process fluid.

Flow measurement compensation technique for use with an averaging pitot

A transmitter in a process control loop includes a sensor for sensing a process variable. An analog-to-digital converter coupled to the sensor provides a digitized process variable at various sample times. An interface couples the transmitter to the control loop and is used for communicating information and receiving power over the control loop. The transmitter includes a clock and a memory. A microprocessor coupled to the clock and the memory stores digitized process variables and clock information in the memory. The storage is such that the sample time of a stored digitized process variable can be determined.

Field transmitter for storing information

A two-wire transmitter senses a pressure using an internal pressure sensor. The transmitter includes an input for receiving a process variable from a remote sensor which is separated from the transmitter. Circuitry in the transmitters transmits information on a two-wire process control loop which is related to the sensed pressure and the process variable.

Transmitter having input for receiving a process variable from a remote

A metal thin film bonds a semiconductor bonding region of a diaphragm layer to a ceramic bonding region of a high modulus support block. The arrangement isolates a pressure sensing diaphragm from undesired strain, improving sensor accuracy. A passageway through the support block couples the fluid pressure to the sensing diaphragm to deflect it. Capacitive coupling between the diaphragm and a capacitor plate on the support block sense the deflection and provide an output representative of pressure.

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Chanhassen, MN, United States of America

Brian J Bischoff