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Device for the detection of the clogging of an air filter

  • US 5,429,649 A
  • Filed: 04/13/1993
  • Issued: 07/04/1995
  • Est. Priority Date: 04/14/1992
  • Status: Expired due to Term
First Claim
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1. A device for detecting clogging of an air filter located in a main duct of an air treatment apparatus operating with a constant or variable air flow, comprisingan auxiliary air duct opening upstream and downstream of the air filter so as to generate in the auxiliary duct an air flow due to the head loss of the air filter, the air flow through the auxiliary duct having a velocity relative to the head loss, the auxiliary duct extending through the air filter such that the air flow through the auxiliary duct does not flow through the air filter;

  • means for positioning the auxiliary duct within and in the same axial direction as the main duct;

    first sensing means arranged entirely within the main duct in proximity to the air filter for providing a signal relative to the flow velocity of the air flowing through the air filter;

    second sensing means arranged within the auxiliary duct in proximity to the first sensing means for providing a signal relative to the air flow velocity in the auxiliary duct; and

    an electronic circuit for receiving the signals from the first and second sensing means and generating a signal representative of a limit clogging of the air filter when the air flow speeds in the main duct and the auxiliary duct are differing by a determined value corresponding to a limit head loss of the air filter.

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