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Detection of obstruction of doors

  • US 20030192252A1
  • Filed: 04/10/2002
  • Published: 10/16/2003
  • Est. Priority Date: 10/05/1999
  • Status: Active Grant
First Claim
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1. A method of testing the integrity of a sensing element for an obstruction detection system, said sensing element defining an interior space containing a fluid and being adapted to produce a detectable change in pressure in said fluid if an obstruction is encountered, said testing method comprising:

  • applying to the interior space of the sensing element a predetermined change in pressure of fluid;

    providing for relief of said changed pressure in a predetermined manner;

    and assessing a characteristic of the manner in which said change in pressure is actually relieved to provide, in comparison with said predetermined manner, an indication of said integrity.

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