Apparatus and method for displaying mass flow controller pressure
First Claim
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1. A mass flow sensor for operation with a mass flow controller that includes an outlet control valve for controlling fluid flow through the controller, the mass flow sensor comprising:
- a thermal mass flow sensor, including a sensor bypass, configured to sense flow of fluid into an inlet of the controller and to produce a mass flow signal representative of said flow;
a pressure sensor configured to sense fluid pressure in a volume between the thermal mass flow sensor bypass and the outlet control valve;
an electronic controller configured to provide a closed loop control signal for said outlet control valve based on said mass flow signal; and
a display configured to display the fluid pressure sensed by said pressure sensor.
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Abstract
A mass flow controller includes a pressure sensor that senses pressure within the mass flow controller and displays the pressure. The pressure display may be local, mounted directly to the mass flow controller, or it may be connected through a link to the mass flow controller for remote display.
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Citations
26 Claims
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1. A mass flow sensor for operation with a mass flow controller that includes an outlet control valve for controlling fluid flow through the controller, the mass flow sensor comprising:
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a thermal mass flow sensor, including a sensor bypass, configured to sense flow of fluid into an inlet of the controller and to produce a mass flow signal representative of said flow; a pressure sensor configured to sense fluid pressure in a volume between the thermal mass flow sensor bypass and the outlet control valve; an electronic controller configured to provide a closed loop control signal for said outlet control valve based on said mass flow signal; and a display configured to display the fluid pressure sensed by said pressure sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A mass flow controller comprising:
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a thermal mass flow sensor, including a sensor bypass, configured to sense the flow of fluid into an inlet of the controller and to produce a mass flow signal representative of said flow; a pressure sensor configured to sense fluid pressure in a volume between the thermal mass flow sensor bypass and an outlet control valve; a display configured to display the pressure sensed by said pressure sensor; and an electronic controller configured to produce a closed loop control signal for the outlet control valve based on said mass flow signal, wherein said electronic controller comprises a dual-processor controller that is configured to provide a network interface that permits the execution of mass flow controller active diagnostics from a device connected to the network. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A mass flow controller comprising:
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a thermal mass flow sensor, including a sensor bypass, configured to sense the flow of fluid into an inlet of the controller and to produce a mass flow signal representative of said flow; a pressure sensor configured to sense fluid pressure in a volume between the thermal mass flow sensor bypass and an outlet control valve; a display configured to display the pressure sensed by said pressure sensor; and an electronic controller configured to produce a closed loop control signal for the outlet control valve based on said mass flow signal, wherein said electronic controller comprises a dual-processor controller that is configured to provide a network interface that permits the execution of mass flow controller active diagnostics from a device connected to the network; wherein said dual processors include a processor configured to operate in a deterministic mode and a processor configured to operate in a non-deterministic mode and the deterministic processor is configured to produce said closed loop control signal for an outlet valve. - View Dependent Claims (24, 25, 26)
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Specification