Resistive Patents (Class 73/750)
  • Method of operating a resistive heat-loss pressure sensor
    Patent number: 7249516
    Abstract: In a resistively heated heat-loss pressure gauge, electrical current is switched between a sensing element and a compensating element at different duty cycles. As a result, the sensing element is heated relative to the compensating element. A fixed resistance is placed in series with at least the compensating element. The current source applies current to heat the sensing element to a temperature at which the resistance of the sensing element matches the combined resistance of the compensating element and the fixed resistive element.
    Type: Grant
    Filed: June 7, 2005
    Date of Patent: July 31, 2007
    Assignee: Brooks Automation, Inc.
    Inventors: Michael D. Borenstein, Paul C. Arnold
  • Electrical mercury manometer
    Patent number: 5189917
    Abstract: A device for monitoring pressure variations for mercury manometers including; a manometer tube with a column of mercury; at least two taps in the tube with one tap in the mercury column and the other above the column; a power supply interconnected between the taps; a resistance element extending between the taps in the mercury; and means for sensing the output voltage across the taps representative of the variations in the shunting effect on the resistance element of the mercury column as it rises and falls with pressure.
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: March 2, 1993
    Assignee: Trustees of Boston University
    Inventors: Kallambella M. Vijayakumar, Junchang Dong