Patent
Apparatus and method for pressure fluctuation insensitive mass flow control
TLDR
A mass flow controller includes a thermal mass flow sensor in combination with a pressure sensor to provide a mass flow control valve that is relatively insensitive to fluctuations in input pressure as discussed by the authors, where the measured pressure is used to compensate the measured inlet flow rate and to produce a compensated measure of the outlet flow rate.Abstract:
A mass flow controller includes a thermal mass flow sensor in combination with a pressure sensor to provide a mass flow controller that is relatively insensitive to fluctuations in input pressure. The pressure sensor and thermal sensor respectively provide signals to an electronic controller indicating the measured inlet flow rate and the pressure within the dead volume. The electronic controller employs the measured pressure to compensate the measured inlet flow rate and to thereby produce a compensated measure of the outlet flow rate, which may be used to operate a mass flow controller control valve.read more
Citations
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Patent
Methods and apparatus for pressure compensation in a mass flow controller
TL;DR: In this article, a method and system for compensating for pressure transients in the pressure environment of a flow path and mass flow controller is presented, and a system and method for reducing or eliminating performance degradations, instabilities, and/or inaccuracies of mass flow controllers caused by changes in the environment.
Patent
System and method for in-situ flow verification and calibration
TL;DR: In this article, a system and method for in-situ verification and calibration of flow control devices includes a first network physical layer connecting the flow control device to a flow verification device.
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Flow sensor signal conversion
TL;DR: In this paper, a method of obtaining at least one representation of a characteristic function of a sensor from a test fluid during calibration of the sensor according to a sensor model has been proposed.
References
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Patent
Distributed interface architecture for programmable industrial control systems
TL;DR: In this paper, an integrated control system comprises one or more controllers each equipped to perform a control function and to gather data (ordinarily from sensors) relevant to the control function; each controller contains computer storage means, such as computer memory, for storing the relevant data and instructions associated with the data, for causing a remote computer to generate a visual display incorporating the data in a predetermined format; and a communication module for establishing contact and facilitating data interchange with the remote computer.
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Dean A. Groton Papadopoulos,Allan Tanzman,A. Richard West Newbury Baker,Rodolfo G. Belliardi,Dennis J. W. Dube +4 more
TL;DR: In this article, the authors present an Internet web interface between the network and the programmable logic controller (PLC), which translates the industry standard Ethernet, TCP/IP and HTTP protocols used on the Internet into data recognizable to the PLC.
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TL;DR: In this paper, a process device (32) is adapted to couple to a process control loop (36) and communicate on the process control loops in accordance with an internet protocol.
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