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Automatic air-in-line fluid detector

  • US 4,114,144 A
  • Filed: 08/12/1976
  • Issued: 09/12/1978
  • Est. Priority Date: 08/12/1976
  • Status: Expired due to Term
First Claim
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1. An automatic fluid detector for detecting the presence of air in a fluid line containing either an opaque or a transparent fluid, includingmeans for supporting a portion of the fluid line for detection of air in the fluid line,first means operatively coupled to the supported portion of the fluid line and responsive to the fluid line containing air or the opaque fluid for producing a first signal in accordance with the fluid line containing air or the opaque fluid and responsive to the fluid line containing the transparent fluid for producing a second signal in accordance with the fluid line containing the transparent fluid,second means operatively coupled to the supported portion of the fluid line and responsive to the fluid line containing the opaque fluid for producing a first signal in accordance with the fluid line containing the opaque fluid and responsive to the fluid line containing air or the transparent fluid for producing a second signal in accordance with the fluid line containing air or the transparent fluid,third means operatively coupled to the first and second means and responsive to the first means producing the first signal for passing the first and second signals from the second means, andfourth means operatively coupled to the first and second means and responsive to the second means producing the second signal for passing the first and second signals from the first means.

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