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Low differential pressure generator

  • US 5,693,871 A
  • Filed: 07/12/1996
  • Issued: 12/02/1997
  • Est. Priority Date: 07/12/1996
  • Status: Expired due to Term
First Claim
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1. A method for calibrating low differential pressure transducers comprising:

  • (a) providing a closed gas .fluid system including a pair of adjacent chambers of substantially equal physical volumes, each chamber having a first port and a second port,(b) increasing the pressure of gas in one of the chambers while simultaneously decreasing the pressure of gas in the other of said chambers by feeding gas through the first port of said one chamber and expelling gas through the first port of the other chamber so as to provide a differential gas pressure between the second ports of said chambers,(c) placing a transducer to be calibrated and a standard pre-calibrated transducer at a respective location relative to said second ports permitting each transducer to be exposed to said differential gas pressure,(d) obtaining a signal from said standard pre-calibrated transducer in response to the pressure differential, and(e) obtaining a signal from said transducer to be calibrated in response to said pressure differential.

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