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Digital differential pressure measurement apparatus

  • US 4,091,682 A
  • Filed: 04/04/1977
  • Issued: 05/30/1978
  • Est. Priority Date: 04/04/1977
  • Status: Expired due to Term
First Claim
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1. Digital pressure differential measurement apparatus comprising:

  • a first electromechanical transducer adapted to provide a first series of pulses at a first frequency;

    a second electromechanical transducer adapted to provide a second series of pulses at a second frequency, which second frequency is inversely related to a force applied to said second transducer;

    force applying means responsive to a pressure differential adapted to apply a force, directly related to said pressure differential, to said second transducer; and

    modulator means adapted to receive said first and second series of pulses and to provide a third series of pulses at a third frequency, said third frequency being related to the difference between said first and second frequencies.

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