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Apparatus and method for displaying mass flow controller pressure

  • US 7,552,015 B2
  • Filed: 06/24/2002
  • Issued: 06/23/2009
  • Est. Priority Date: 06/24/2002
  • Status: Expired due to Term
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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