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Automatic turbidimetric titration

  • US 4,095,272 A
  • Filed: 01/11/1977
  • Issued: 06/13/1978
  • Est. Priority Date: 01/11/1977
  • Status: Expired due to Term
First Claim
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1. Automatic turbidimetric titration apparatus comprisingmeans adapted to contain a liquid medium to be titrated;

  • titrant supply means adapted to introduce a turbidimetric titrant into said medium at a gradual rate;

    optoelectronic means adapted to produce an analog measurement signal representative of the turbidity of the medium being titrated;

    differentiating means adapted to produce, responsive to said analog measurement signal, a differentiated signal representative of the first derivative of said analog measurement signal;

    means adapted to compare said differentiated signal with a reference signal and to produce a control signal when said differentiated signal has a predetermined relationship with said reference signal, said predetermined relationship being representative of the occurrence of the titration end-point; and

    means responsive to said control signal adapted to produce a titration end-point signal representative of the amount of said titrant added to the medium being titrated in order to achieve said predetermined relationship between said reference signal and said differentiated signal.

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