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Measuring device with connection for a removable sensor

  • US 5,502,396 A
  • Filed: 09/21/1994
  • Issued: 03/26/1996
  • Est. Priority Date: 09/21/1993
  • Status: Expired due to Term
First Claim
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1. A measuring device for use with a removable sensor, said sensor having at least an active zone for sensing a physical or chemical parameter, and having at least two electrical contact surfaces electrically connected to said active zone, said measuring device having a normal mode and a test mode, and comprising:

  • an electric measuring circuit for measuring, in said normal mode, said physical or chemical parameter based on said sensing of said active zone;

    a connection comprising at least two first contacts, each of said first contacts establishing a respective electric connection between said two electrical contact surfaces of said removable sensor and said electric measuring circuit;

    a testing unit for testing said electric connection between said two electrical contact surfaces of said removable sensor and said electric measuring circuit; and

    said connection also comprising at least two second contacts, each of said second contacts;

    a) establishing a respective electric connection between said two electrical contact surfaces of said removable sensor and said testing unit, andb) enabling an electric test current to flow, in said test mode, between any one of said two first contacts and a respective one of said second contacts which is associated with an identical one of said two electrical contact surfaces.

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