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Exhaust-gas analyzer

  • US 5,218,857 A
  • Filed: 05/14/1991
  • Issued: 06/15/1993
  • Est. Priority Date: 05/14/1990
  • Status: Expired due to Fees
First Claim
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1. An exhaust-gas analyzer such as for emissions testing of motor-vehicle engines comprises:

  • a sampling tube into which a mixture of exhaust gas and ambient air is fed through gas lines;

    a gas feed pump disposed downstream of said sampling tube;

    a flowmeter disposed in an air line upstream of said gas feed pump and producing electrical signals; and

    a computing unit, which computes the instantaneous standard total flow rate using said electrical signals, while allowing for gas pressure and gas temperature.

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