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Gas flow metering

  • US 4,484,479 A
  • Filed: 04/05/1978
  • Issued: 11/27/1984
  • Est. Priority Date: 04/05/1978
  • Status: Expired due to Term
First Claim
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1. Flow metering instrument comprising a casing, a a tubular flow through passage in said casing, a membrane stretched taut in said flow passage and arranged to deflect in accordance with flow back pressure changes to an extent in accordance with Bernouilli'"'"'s principle,means on the interior of said casing providing a signal directly responsive to the deflection of the membrane by measuring capacitance change,means defining a conductive surface on said stretched membrane,said signal providing means comprising means defining a capacitive gap between said means on the interior of said casing and the said conductive surface,whereby the said deflection of the membrane will vary the size of the capacitive gap and thereby vary an electrical signal obtainable through use of said gap.

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