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Continuously operated gas analyzer

  • US 5,245,857 A
  • Filed: 04/16/1992
  • Issued: 09/21/1993
  • Est. Priority Date: 04/26/1991
  • Status: Expired due to Fees
First Claim
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1. A continuously operated gas analyser comprisinga) a detector (3) which is dependent upon the mass flow of the gas to be analyzed,b) a suction device (4) at the detector output,c) a vacuum regulating circuit (6) which is connected to the detector output and which maintains constant the vacuum p3, generated by the suction device (4), at the detector output in relation to the atmospheric pressure po,d) a first choke (11) which is connected upstream of the detector (3) in the pipe-line for the gas to be measured,e) a second choke (11) which is connected in parallel to the series arrangement of first choke (2) and detector (3) as a by-pass,f) a third choke (11) which is connected upstream of the common gas inlet (12, 13) into the first choke and the second choke, andg) a further vacuum regulating circuit (14) which is connected to the common gas inlet and which maintains constant the pressure p2 prevailing at said connection point in relation to the atmospheric pressure po,characterized in that the vacuum regulating circuits (6, 14) each comprise a piezoelectric pressure sensor (18a, 18b), a proportional/integral controller (20a, 20b) and an electropneumatic control element (21a, 21b).

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