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Chemical level measurement device with easy action cover and single control mode selection capability

  • US 5,037,614 A
  • Filed: 03/27/1990
  • Issued: 08/06/1991
  • Est. Priority Date: 07/15/1986
  • Status: Expired due to Fees
First Claim
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1. A device for measuring an amount of a certain chemical in a liquid which has infiltrated a piece of test medium impregnated with a test chemical having optical properties which alter according to the amount of the certain chemical, comprising:

  • (a) a casing;

    (b) test medium insertion means provided in the casing;

    (c) a test medium holder provided in the test medium insertion means;

    (d) means for emitting light onto a test medium and located opposite the test medium holder;

    (e) means for sensing light coming from the test medium and opposite the test medium holder, which produces an output signal indicative of the optical properties of the test medium;

    (f) a cover for the test medium insertion means slidably mounted on the casing so that the cover will slidably move to cover the test medium insertion means when the test medium insertion means cover is in a closed position, and to expose the test medium insertion menas when the test medium insertion means cover is in an opened position;

    (g) means for biasing the test medium insertion cover in one sliding direction thereof;

    (h) means for engaging the test medium insertion means cover in an extreme position in a direction opposite to the one sliding direction thereof; and

    (i) means for releasing the engagement of the engaging means from the test medium insertion cover.

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